[{"article_type":"original","arxiv":1,"oa_version":"Published Version","author":[{"id":"9a9394cb-3200-11ee-973b-f5ba2a8b16e4","orcid":"0000-0001-5346-6048","last_name":"Kramarenko","full_name":"Kramarenko, Ivan","first_name":"Ivan"},{"last_name":"Kerutt","first_name":"J","full_name":"Kerutt, J"},{"full_name":"Verhamme, A","first_name":"A","last_name":"Verhamme"},{"full_name":"Oesch, P A","first_name":"P A","last_name":"Oesch"},{"last_name":"Barrufet","first_name":"L","full_name":"Barrufet, L"},{"first_name":"Jorryt J","full_name":"Matthee, Jorryt J","id":"7439a258-f3c0-11ec-9501-9df22fe06720","last_name":"Matthee","orcid":"0000-0003-2871-127X"},{"first_name":"H","full_name":"Kusakabe, H","last_name":"Kusakabe"},{"full_name":"Goovaerts, I","first_name":"I","last_name":"Goovaerts"},{"first_name":"T T","full_name":"Thai, T T","last_name":"Thai"}],"publication_identifier":{"issn":["0035-8711"],"eissn":["1365-2966"]},"user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","corr_author":"1","acknowledgement":"We thank the anonymous referee for the constructive feedback that helped to improve the manuscript. We thank Michael Maseda, Daniel Schaerer, Charlotte Simmonds, and Rashmi Gottumukkala for useful comments and productive discussions. We also thank the organizers and participants of the 24th MUSE Science Busy Week in Leiden. IGK acknowledges an Excellence Master Fellowship granted by the Faculty of Science of the University of Geneva. This work has received funding from the Swiss State Secretariat for Education, Research and Innovation (SERI) under contract number MB22.00072, as well as from the Swiss National Science Foundation (SNSF) through project grant number 200020_207349 and SNSF Professorship grant number 190079. The Cosmic Dawn Center (DAWN) is funded by the Danish National Research Foundation under grant number 140. This paper is based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programmes 094.A-0289(B), 095.A-0010(A), 096.A-0045(A), 096.A-0045(B), 094.A-0205, 095.A-0240, 096.A-0090, 097.A-0160, and 098.A-0017. We made extensive use of several open-source software packages and we are thankful to the respective authors for sharing their work: NUMPY (Harris et al. 2020), ASTROPY (Astropy Collaboration 2022), MATPLOTLIB (Hunter 2007), IPYTHON (Perez & Granger 2007), and TOPCAT (Taylor 2005).","date_updated":"2025-09-04T11:51:50Z","publication":"Monthly Notices of the Royal Astronomical Society","file_date_updated":"2024-01-23T12:30:45Z","day":"01","department":[{"_id":"GradSch"},{"_id":"JoMa"}],"page":"9853-9871","isi":1,"type":"journal_article","date_published":"2024-02-01T00:00:00Z","DOAJ_listed":"1","publication_status":"published","file":[{"file_id":"14879","content_type":"application/pdf","creator":"dernst","checksum":"9d02df4035c4951cf63dee0db1e462e9","file_size":4521738,"access_level":"open_access","file_name":"2024_MNAstronomSoc_Kramarenko.pdf","relation":"main_file","date_updated":"2024-01-23T12:30:45Z","date_created":"2024-01-23T12:30:45Z","success":1}],"intvolume":"       527","abstract":[{"text":"The physical conditions giving rise to high escape fractions of ionizing radiation (LyC fesc) in star-forming galaxies – most likely protagonists of cosmic reionization – are not yet fully understood. Using the VLT/MUSE observations of ∼1400 Ly α emitters at 2.9 &amp;lt; z &amp;lt; 6.7, we compare stacked rest-frame UV spectra of candidates for LyC leakers and non-leakers selected based on their Ly α profiles. We find that the stacks of potential LyC leakers, i.e. galaxies with narrow, symmetric Ly α profiles with small peak separation, generally show (i) strong nebular O iii]λ1666, [Si iii]λ1883, and [C iii]λ1907 +C iii]λ1909 emission, indicating a high-ionization state of the interstellar medium (ISM); (ii) high equivalent widths of He iiλ1640 (∼1 − 3 Å), suggesting the presence of hard ionizing radiation fields; (iii) Si ii*λ1533 emission, revealing substantial amounts of neutral hydrogen off the line of sight; (iv) high C ivλλ1548,1550 to [C iii]λ1907 +C iii]λ1909 ratios (C iv/C iii] ≳0.75) , signalling the presence of low column density channels in the ISM. In contrast, the stacks with broad, asymmetric Ly α profiles with large peak separation show weak nebular emission lines, low He iiλ1640 equivalent widths (≲1 Å), and low C iv/C iii] (≲0.25), implying low-ionization states and high-neutral hydrogen column densities. Our results suggest that C iv/C iii] might be sensitive to the physical conditions that govern LyC photon escape, providing a promising tool for identification of ionizing sources among star-forming galaxies in the epoch of reionization.","lang":"eng"}],"keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"publisher":"Oxford University Press","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)"},"title":"Linking UV spectral properties of MUSE Ly α emitters at <i>z</i> ≳ 3 to Lyman continuum escape","has_accepted_license":"1","year":"2024","scopus_import":"1","oa":1,"external_id":{"isi":["001133672400004"],"arxiv":["2305.07044"]},"ddc":["520"],"_id":"14852","article_processing_charge":"Yes","quality_controlled":"1","volume":527,"language":[{"iso":"eng"}],"doi":"10.1093/mnras/stad3853","status":"public","date_created":"2024-01-22T08:22:17Z","month":"02","issue":"4","citation":{"apa":"Kramarenko, I., Kerutt, J., Verhamme, A., Oesch, P. A., Barrufet, L., Matthee, J. J., … Thai, T. T. (2024). Linking UV spectral properties of MUSE Ly α emitters at <i>z</i> ≳ 3 to Lyman continuum escape. <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press. <a href=\"https://doi.org/10.1093/mnras/stad3853\">https://doi.org/10.1093/mnras/stad3853</a>","ieee":"I. Kramarenko <i>et al.</i>, “Linking UV spectral properties of MUSE Ly α emitters at <i>z</i> ≳ 3 to Lyman continuum escape,” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 527, no. 4. Oxford University Press, pp. 9853–9871, 2024.","mla":"Kramarenko, Ivan, et al. “Linking UV Spectral Properties of MUSE Ly α Emitters at <i>z</i> ≳ 3 to Lyman Continuum Escape.” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 527, no. 4, Oxford University Press, 2024, pp. 9853–71, doi:<a href=\"https://doi.org/10.1093/mnras/stad3853\">10.1093/mnras/stad3853</a>.","ama":"Kramarenko I, Kerutt J, Verhamme A, et al. Linking UV spectral properties of MUSE Ly α emitters at <i>z</i> ≳ 3 to Lyman continuum escape. <i>Monthly Notices of the Royal Astronomical Society</i>. 2024;527(4):9853-9871. doi:<a href=\"https://doi.org/10.1093/mnras/stad3853\">10.1093/mnras/stad3853</a>","chicago":"Kramarenko, Ivan, J Kerutt, A Verhamme, P A Oesch, L Barrufet, Jorryt J Matthee, H Kusakabe, I Goovaerts, and T T Thai. “Linking UV Spectral Properties of MUSE Ly α Emitters at <i>z</i> ≳ 3 to Lyman Continuum Escape.” <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press, 2024. <a href=\"https://doi.org/10.1093/mnras/stad3853\">https://doi.org/10.1093/mnras/stad3853</a>.","ista":"Kramarenko I, Kerutt J, Verhamme A, Oesch PA, Barrufet L, Matthee JJ, Kusakabe H, Goovaerts I, Thai TT. 2024. Linking UV spectral properties of MUSE Ly α emitters at <i>z</i> ≳ 3 to Lyman continuum escape. Monthly Notices of the Royal Astronomical Society. 527(4), 9853–9871.","short":"I. Kramarenko, J. Kerutt, A. Verhamme, P.A. Oesch, L. Barrufet, J.J. Matthee, H. Kusakabe, I. Goovaerts, T.T. Thai, Monthly Notices of the Royal Astronomical Society 527 (2024) 9853–9871."}},{"year":"2024","scopus_import":"1","extern":"1","abstract":[{"lang":"eng","text":"Cataclysmic variables (CVs) that have evolved past the period minimum during their lifetimes are predicted to be systems with a brown dwarf donor. While population synthesis models predict that around 40–70 per cent of the Galactic CVs are post-period minimum systems referred to as ‘period bouncers’, only a few dozen confirmed systems are known. We report the study and characterization of a new eclipsing CV, SRGeJ041130.3+685350 (SRGeJ0411), discovered from a joint SRG/eROSITA and ZTF programme. The optical spectrum of SRGeJ0411 shows prominent hydrogen and helium emission lines, typical for CVs. We obtained optical high-speed photometry to confirm the eclipse of SRGeJ0411 and determine the orbital period to be Porb ≈ 97.530 min. The spectral energy distribution suggests that the donor has an effective temperature of ≲ 1800 K. We constrain the donor mass with the period–density relationship for Roche lobe-filling stars and find that Mdonor ≲ 0.04 M⊙. The binary parameters are consistent with evolutionary models for post-period minimum CVs, suggesting that SRGeJ0411 is a new period bouncer. The optical emission lines of SRGeJ0411 are single-peaked despite the system being eclipsing, which is typically only seen due to stream-fed accretion in polars. X-ray spectroscopy hints that the white dwarf in SRGeJ0411 could be magnetic, but verifying the magnetic nature of SRGeJ0411 requires further investigation. The lack of optical outbursts has made SRGeJ0411 elusive in previous surveys, and joint X-ray and optical surveys highlight the potential for discovering similar systems in the near future."}],"keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"title":"A joint SRG/eROSITA + ZTF search: Discovery of a 97-min period eclipsing cataclysmic variable with evidence of a brown dwarf secondary","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)"},"publisher":"Oxford University Press","doi":"10.1093/mnras/stae012","volume":528,"language":[{"iso":"eng"}],"month":"01","citation":{"short":"I. Galiullin, A.C. Rodriguez, S.R. Kulkarni, R. Sunyaev, M. Gilfanov, I. Bikmaev, L. Yungelson, J. van Roestel, B.T. Gänsicke, I. Khamitov, P. Szkody, K. El-Badry, M. Suslikov, T.A. Prince, M. Buntov, I. Caiazzo, M. Gorbachev, M.J. Graham, R. Gumerov, E. Irtuganov, R.R. Laher, P. Medvedev, R. Riddle, B. Rusholme, N. Sakhibullin, A. Sklyanov, Z.P. Vanderbosch, Monthly Notices of the Royal Astronomical Society 528 (2024) 676–692.","ista":"Galiullin I, Rodriguez AC, Kulkarni SR, Sunyaev R, Gilfanov M, Bikmaev I, Yungelson L, van Roestel J, Gänsicke BT, Khamitov I, Szkody P, El-Badry K, Suslikov M, Prince TA, Buntov M, Caiazzo I, Gorbachev M, Graham MJ, Gumerov R, Irtuganov E, Laher RR, Medvedev P, Riddle R, Rusholme B, Sakhibullin N, Sklyanov A, Vanderbosch ZP. 2024. A joint SRG/eROSITA + ZTF search: Discovery of a 97-min period eclipsing cataclysmic variable with evidence of a brown dwarf secondary. Monthly Notices of the Royal Astronomical Society. 528(1), 676–692.","chicago":"Galiullin, Ilkham, Antonio C Rodriguez, Shrinivas R Kulkarni, Rashid Sunyaev, Marat Gilfanov, Ilfan Bikmaev, Lev Yungelson, et al. “A Joint SRG/EROSITA + ZTF Search: Discovery of a 97-Min Period Eclipsing Cataclysmic Variable with Evidence of a Brown Dwarf Secondary.” <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press, 2024. <a href=\"https://doi.org/10.1093/mnras/stae012\">https://doi.org/10.1093/mnras/stae012</a>.","ama":"Galiullin I, Rodriguez AC, Kulkarni SR, et al. A joint SRG/eROSITA + ZTF search: Discovery of a 97-min period eclipsing cataclysmic variable with evidence of a brown dwarf secondary. <i>Monthly Notices of the Royal Astronomical Society</i>. 2024;528(1):676-692. doi:<a href=\"https://doi.org/10.1093/mnras/stae012\">10.1093/mnras/stae012</a>","mla":"Galiullin, Ilkham, et al. “A Joint SRG/EROSITA + ZTF Search: Discovery of a 97-Min Period Eclipsing Cataclysmic Variable with Evidence of a Brown Dwarf Secondary.” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 528, no. 1, Oxford University Press, 2024, pp. 676–92, doi:<a href=\"https://doi.org/10.1093/mnras/stae012\">10.1093/mnras/stae012</a>.","ieee":"I. Galiullin <i>et al.</i>, “A joint SRG/eROSITA + ZTF search: Discovery of a 97-min period eclipsing cataclysmic variable with evidence of a brown dwarf secondary,” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 528, no. 1. Oxford University Press, pp. 676–692, 2024.","apa":"Galiullin, I., Rodriguez, A. C., Kulkarni, S. R., Sunyaev, R., Gilfanov, M., Bikmaev, I., … Vanderbosch, Z. P. (2024). A joint SRG/eROSITA + ZTF search: Discovery of a 97-min period eclipsing cataclysmic variable with evidence of a brown dwarf secondary. <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press. <a href=\"https://doi.org/10.1093/mnras/stae012\">https://doi.org/10.1093/mnras/stae012</a>"},"issue":"1","status":"public","date_created":"2024-03-26T09:43:55Z","external_id":{"arxiv":["2401.04178"]},"oa":1,"article_processing_charge":"No","_id":"15189","quality_controlled":"1","date_updated":"2024-04-02T06:50:01Z","publication":"Monthly Notices of the Royal Astronomical Society","oa_version":"Published Version","main_file_link":[{"url":"https://doi.org/10.1093/mnras/stae012","open_access":"1"}],"arxiv":1,"article_type":"original","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"last_name":"Galiullin","first_name":"Ilkham","full_name":"Galiullin, Ilkham"},{"last_name":"Rodriguez","first_name":"Antonio C","full_name":"Rodriguez, Antonio C"},{"full_name":"Kulkarni, Shrinivas R","first_name":"Shrinivas R","last_name":"Kulkarni"},{"first_name":"Rashid","full_name":"Sunyaev, Rashid","last_name":"Sunyaev"},{"last_name":"Gilfanov","first_name":"Marat","full_name":"Gilfanov, Marat"},{"first_name":"Ilfan","full_name":"Bikmaev, Ilfan","last_name":"Bikmaev"},{"last_name":"Yungelson","first_name":"Lev","full_name":"Yungelson, Lev"},{"first_name":"Jan","full_name":"van Roestel, Jan","last_name":"van Roestel"},{"last_name":"Gänsicke","full_name":"Gänsicke, Boris T","first_name":"Boris T"},{"full_name":"Khamitov, Irek","first_name":"Irek","last_name":"Khamitov"},{"last_name":"Szkody","full_name":"Szkody, Paula","first_name":"Paula"},{"last_name":"El-Badry","full_name":"El-Badry, Kareem","first_name":"Kareem"},{"last_name":"Suslikov","first_name":"Mikhail","full_name":"Suslikov, Mikhail"},{"last_name":"Prince","full_name":"Prince, Thomas A","first_name":"Thomas A"},{"last_name":"Buntov","first_name":"Mikhail","full_name":"Buntov, Mikhail"},{"orcid":"0000-0002-4770-5388","last_name":"Caiazzo","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","first_name":"Ilaria","full_name":"Caiazzo, Ilaria"},{"full_name":"Gorbachev, Mark","first_name":"Mark","last_name":"Gorbachev"},{"full_name":"Graham, Matthew J","first_name":"Matthew J","last_name":"Graham"},{"first_name":"Rustam","full_name":"Gumerov, Rustam","last_name":"Gumerov"},{"full_name":"Irtuganov, Eldar","first_name":"Eldar","last_name":"Irtuganov"},{"last_name":"Laher","full_name":"Laher, Russ R","first_name":"Russ R"},{"last_name":"Medvedev","full_name":"Medvedev, Pavel","first_name":"Pavel"},{"first_name":"Reed","full_name":"Riddle, Reed","last_name":"Riddle"},{"last_name":"Rusholme","full_name":"Rusholme, Ben","first_name":"Ben"},{"first_name":"Nail","full_name":"Sakhibullin, Nail","last_name":"Sakhibullin"},{"last_name":"Sklyanov","first_name":"Alexander","full_name":"Sklyanov, Alexander"},{"last_name":"Vanderbosch","full_name":"Vanderbosch, Zachary P","first_name":"Zachary P"}],"publication_identifier":{"eissn":["1365-2966"],"issn":["0035-8711"]},"intvolume":"       528","publication_status":"published","page":"676-692","type":"journal_article","day":"04","date_published":"2024-01-04T00:00:00Z"},{"_id":"15191","article_processing_charge":"No","quality_controlled":"1","external_id":{"arxiv":["2310.11800"]},"oa":1,"issue":"1","citation":{"apa":"Gerasimov, R., Burgasser, A. J., Caiazzo, I., Homeier, D., Richer, H. B., Correnti, M., &#38; Heyl, J. (2024). Exploring the chemistry and mass function of the globular cluster 47 Tucanae with new theoretical color–magnitude diagrams. <i>The Astrophysical Journal</i>. American Astronomical Society. <a href=\"https://doi.org/10.3847/1538-4357/ad08bf\">https://doi.org/10.3847/1538-4357/ad08bf</a>","ieee":"R. Gerasimov <i>et al.</i>, “Exploring the chemistry and mass function of the globular cluster 47 Tucanae with new theoretical color–magnitude diagrams,” <i>The Astrophysical Journal</i>, vol. 961, no. 1. American Astronomical Society, 2024.","mla":"Gerasimov, Roman, et al. “Exploring the Chemistry and Mass Function of the Globular Cluster 47 Tucanae with New Theoretical Color–Magnitude Diagrams.” <i>The Astrophysical Journal</i>, vol. 961, no. 1, 139, American Astronomical Society, 2024, doi:<a href=\"https://doi.org/10.3847/1538-4357/ad08bf\">10.3847/1538-4357/ad08bf</a>.","ama":"Gerasimov R, Burgasser AJ, Caiazzo I, et al. Exploring the chemistry and mass function of the globular cluster 47 Tucanae with new theoretical color–magnitude diagrams. <i>The Astrophysical Journal</i>. 2024;961(1). doi:<a href=\"https://doi.org/10.3847/1538-4357/ad08bf\">10.3847/1538-4357/ad08bf</a>","ista":"Gerasimov R, Burgasser AJ, Caiazzo I, Homeier D, Richer HB, Correnti M, Heyl J. 2024. Exploring the chemistry and mass function of the globular cluster 47 Tucanae with new theoretical color–magnitude diagrams. The Astrophysical Journal. 961(1), 139.","chicago":"Gerasimov, Roman, Adam J. Burgasser, Ilaria Caiazzo, Derek Homeier, Harvey B. Richer, Matteo Correnti, and Jeremy Heyl. “Exploring the Chemistry and Mass Function of the Globular Cluster 47 Tucanae with New Theoretical Color–Magnitude Diagrams.” <i>The Astrophysical Journal</i>. American Astronomical Society, 2024. <a href=\"https://doi.org/10.3847/1538-4357/ad08bf\">https://doi.org/10.3847/1538-4357/ad08bf</a>.","short":"R. Gerasimov, A.J. Burgasser, I. Caiazzo, D. Homeier, H.B. Richer, M. Correnti, J. Heyl, The Astrophysical Journal 961 (2024)."},"month":"01","date_created":"2024-03-26T09:44:50Z","status":"public","doi":"10.3847/1538-4357/ad08bf","language":[{"iso":"eng"}],"volume":961,"tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)"},"title":"Exploring the chemistry and mass function of the globular cluster 47 Tucanae with new theoretical color–magnitude diagrams","publisher":"American Astronomical Society","keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"abstract":[{"text":"Despite their shared origin, members of globular clusters display star-to-star variations in composition. The observed pattern of element abundances is unique to these stellar environments and cannot be fully explained by any proposed mechanism. It remains unclear whether stars form with chemical heterogeneity or inherit it from interactions with other members. These scenarios may be differentiated by the dependence of chemical spread on stellar mass; however, obtaining a sufficiently large mass baseline requires abundance measurements on the lower main sequence, which is too faint for spectroscopy even in the nearest globular clusters. We developed a stellar modeling method to obtain precise chemical abundances for stars near the end of the main sequence from multiband photometry, and we applied it to the globular cluster 47 Tucanae. The computational efficiency is attained by matching chemical elements to the model components that are most sensitive to their abundance. We determined [O/Fe] for ∼5000 members below the main-sequence knee at the level of accuracy, comparable to the spectroscopic measurements of evolved members in the literature. The inferred distribution disfavors stellar interactions as the origin of chemical spread; however, an accurate theory of accretion is required to draw a more definitive conclusion. We anticipate that future observations of 47 Tucanae with the James Webb Space Telescope will extend the mass baseline of our analysis into the substellar regime. Therefore, we present predicted color–magnitude diagrams and mass–magnitude relations for the brown dwarf members of 47 Tucanae.","lang":"eng"}],"scopus_import":"1","year":"2024","extern":"1","date_published":"2024-01-22T00:00:00Z","type":"journal_article","day":"22","intvolume":"       961","publication_status":"published","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"full_name":"Gerasimov, Roman","first_name":"Roman","last_name":"Gerasimov"},{"full_name":"Burgasser, Adam J.","first_name":"Adam J.","last_name":"Burgasser"},{"id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","orcid":"0000-0002-4770-5388","last_name":"Caiazzo","full_name":"Caiazzo, Ilaria","first_name":"Ilaria"},{"first_name":"Derek","full_name":"Homeier, Derek","last_name":"Homeier"},{"last_name":"Richer","full_name":"Richer, Harvey B.","first_name":"Harvey B."},{"first_name":"Matteo","full_name":"Correnti, Matteo","last_name":"Correnti"},{"first_name":"Jeremy","full_name":"Heyl, Jeremy","last_name":"Heyl"}],"publication_identifier":{"eissn":["1538-4357"],"issn":["0004-637X"]},"arxiv":1,"oa_version":"Published Version","main_file_link":[{"url":"https://doi.org/10.3847/1538-4357/ad08bf","open_access":"1"}],"article_number":"139","article_type":"original","publication":"The Astrophysical Journal","date_updated":"2024-04-02T06:52:43Z"},{"keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"abstract":[{"lang":"eng","text":"Characterizing the prevalence and properties of faint active galactic nuclei (AGNs) in the early Universe is key for understanding the formation of supermassive black holes (SMBHs) and determining their role in cosmic reionization. We perform a spectroscopic search for broad Hα emitters at z ≈ 4–6 using deep JWST/NIRCam imaging and wide field slitless spectroscopy from the EIGER and FRESCO surveys. We identify 20 Hα lines at z = 4.2–5.5 that have broad components with line widths from ∼1200–3700 km s−1, contributing ∼30%–90% of the total line flux. We interpret these broad components as being powered by accretion onto SMBHs with implied masses ∼107–8M⊙. In the UV luminosity range MUV,AGN+host = −21 to −18, we measure number densities of ≈10−5 cMpc−3. This is an order of magnitude higher than expected from extrapolating quasar UV luminosity functions (LFs). Yet, such AGN are found in only <1% of star-forming galaxies at z ∼ 5. The number density discrepancy is much lower when compared to the broad Hα LF. The SMBH mass function agrees with large cosmological simulations. In two objects, we detect complex Hα profiles that we tentatively interpret as caused by absorption signatures from dense gas fueling SMBH growth and outflows. We may be witnessing early AGN feedback that will clear dust-free pathways through which more massive blue quasars are seen. We uncover a strong correlation between reddening and the fraction of total galaxy luminosity arising from faint AGN. This implies that early SMBH growth is highly obscured and that faint AGN are only minor contributors to cosmic reionization."}],"title":"Little Red Dots: An abundant population of faint active galactic nuclei at z ∼ 5 revealed by the EIGER and FRESCO JWST surveys","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)"},"publisher":"IOP Publishing","scopus_import":"1","year":"2024","has_accepted_license":"1","external_id":{"isi":["001184703600001"]},"OA_type":"gold","oa":1,"_id":"15180","quality_controlled":"1","article_processing_charge":"Yes","ddc":["550"],"APC_amount":"5666,27 EUR","OA_place":"publisher","doi":"10.3847/1538-4357/ad2345","language":[{"iso":"eng"}],"volume":963,"citation":{"ama":"Matthee JJ, Naidu RP, Brammer G, et al. Little Red Dots: An abundant population of faint active galactic nuclei at z ∼ 5 revealed by the EIGER and FRESCO JWST surveys. <i>The Astrophysical Journal</i>. 2024;963(2). doi:<a href=\"https://doi.org/10.3847/1538-4357/ad2345\">10.3847/1538-4357/ad2345</a>","mla":"Matthee, Jorryt J., et al. “Little Red Dots: An Abundant Population of Faint Active Galactic Nuclei at z ∼ 5 Revealed by the EIGER and FRESCO JWST Surveys.” <i>The Astrophysical Journal</i>, vol. 963, no. 2, 129, IOP Publishing, 2024, doi:<a href=\"https://doi.org/10.3847/1538-4357/ad2345\">10.3847/1538-4357/ad2345</a>.","ieee":"J. J. Matthee <i>et al.</i>, “Little Red Dots: An abundant population of faint active galactic nuclei at z ∼ 5 revealed by the EIGER and FRESCO JWST surveys,” <i>The Astrophysical Journal</i>, vol. 963, no. 2. IOP Publishing, 2024.","apa":"Matthee, J. J., Naidu, R. P., Brammer, G., Chisholm, J., Eilers, A.-C., Goulding, A., … Yue, M. (2024). Little Red Dots: An abundant population of faint active galactic nuclei at z ∼ 5 revealed by the EIGER and FRESCO JWST surveys. <i>The Astrophysical Journal</i>. IOP Publishing. <a href=\"https://doi.org/10.3847/1538-4357/ad2345\">https://doi.org/10.3847/1538-4357/ad2345</a>","short":"J.J. Matthee, R.P. Naidu, G. Brammer, J. Chisholm, A.-C. Eilers, A. Goulding, J. Greene, D. Kashino, I. Labbe, S.J. Lilly, R. Mackenzie, P.A. Oesch, A. Weibel, S. Wuyts, M. Xiao, R. Bordoloi, R. Bouwens, P. van Dokkum, G. Illingworth, I. Kramarenko, M.V. Maseda, C. Mason, R.A. Meyer, E.J. Nelson, N.A. Reddy, I. Shivaei, R.A. Simcoe, M. Yue, The Astrophysical Journal 963 (2024).","ista":"Matthee JJ, Naidu RP, Brammer G, Chisholm J, Eilers A-C, Goulding A, Greene J, Kashino D, Labbe I, Lilly SJ, Mackenzie R, Oesch PA, Weibel A, Wuyts S, Xiao M, Bordoloi R, Bouwens R, van Dokkum P, Illingworth G, Kramarenko I, Maseda MV, Mason C, Meyer RA, Nelson EJ, Reddy NA, Shivaei I, Simcoe RA, Yue M. 2024. Little Red Dots: An abundant population of faint active galactic nuclei at z ∼ 5 revealed by the EIGER and FRESCO JWST surveys. The Astrophysical Journal. 963(2), 129.","chicago":"Matthee, Jorryt J, Rohan P. Naidu, Gabriel Brammer, John Chisholm, Anna-Christina Eilers, Andy Goulding, Jenny Greene, et al. “Little Red Dots: An Abundant Population of Faint Active Galactic Nuclei at z ∼ 5 Revealed by the EIGER and FRESCO JWST Surveys.” <i>The Astrophysical Journal</i>. IOP Publishing, 2024. <a href=\"https://doi.org/10.3847/1538-4357/ad2345\">https://doi.org/10.3847/1538-4357/ad2345</a>."},"issue":"2","month":"03","project":[{"name":"Young galaxies as tracers and agents of cosmic reionization","grant_number":"101076224","_id":"bd9b2118-d553-11ed-ba76-db24564edfea"}],"date_created":"2024-03-25T08:54:47Z","status":"public","das_tickbox":"1","oa_version":"Published Version","article_type":"original","article_number":"129","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publication_identifier":{"issn":["0004-637X"],"eissn":["1538-4357"]},"author":[{"last_name":"Matthee","orcid":"0000-0003-2871-127X","id":"7439a258-f3c0-11ec-9501-9df22fe06720","full_name":"Matthee, Jorryt J","first_name":"Jorryt J"},{"full_name":"Naidu, Rohan P.","first_name":"Rohan P.","last_name":"Naidu"},{"last_name":"Brammer","first_name":"Gabriel","full_name":"Brammer, Gabriel"},{"last_name":"Chisholm","full_name":"Chisholm, John","first_name":"John"},{"first_name":"Anna-Christina","full_name":"Eilers, Anna-Christina","last_name":"Eilers"},{"last_name":"Goulding","full_name":"Goulding, Andy","first_name":"Andy"},{"full_name":"Greene, Jenny","first_name":"Jenny","last_name":"Greene"},{"last_name":"Kashino","full_name":"Kashino, Daichi","first_name":"Daichi"},{"first_name":"Ivo","full_name":"Labbe, Ivo","last_name":"Labbe"},{"full_name":"Lilly, Simon J.","first_name":"Simon J.","last_name":"Lilly"},{"last_name":"Mackenzie","full_name":"Mackenzie, Ruari","first_name":"Ruari"},{"first_name":"Pascal A.","full_name":"Oesch, Pascal A.","last_name":"Oesch"},{"full_name":"Weibel, Andrea","first_name":"Andrea","last_name":"Weibel"},{"last_name":"Wuyts","full_name":"Wuyts, Stijn","first_name":"Stijn"},{"last_name":"Xiao","full_name":"Xiao, Mengyuan","first_name":"Mengyuan"},{"last_name":"Bordoloi","first_name":"Rongmon","full_name":"Bordoloi, Rongmon"},{"last_name":"Bouwens","first_name":"Rychard","full_name":"Bouwens, Rychard"},{"last_name":"van Dokkum","full_name":"van Dokkum, Pieter","first_name":"Pieter"},{"last_name":"Illingworth","full_name":"Illingworth, Garth","first_name":"Garth"},{"last_name":"Kramarenko","first_name":"Ivan","full_name":"Kramarenko, Ivan"},{"last_name":"Maseda","first_name":"Michael V.","full_name":"Maseda, Michael V."},{"last_name":"Mason","full_name":"Mason, Charlotte","first_name":"Charlotte"},{"full_name":"Meyer, Romain A.","first_name":"Romain A.","last_name":"Meyer"},{"last_name":"Nelson","first_name":"Erica J.","full_name":"Nelson, Erica J."},{"first_name":"Naveen A.","full_name":"Reddy, Naveen A.","last_name":"Reddy"},{"last_name":"Shivaei","full_name":"Shivaei, Irene","first_name":"Irene"},{"last_name":"Simcoe","first_name":"Robert A.","full_name":"Simcoe, Robert A."},{"last_name":"Yue","full_name":"Yue, Minghao","first_name":"Minghao"}],"date_updated":"2026-07-06T12:20:54Z","acknowledgement":"We thank the anonymous referee for constructive comments that helped improve the manuscript. This work is based on observations made with the NASA/ESA/CSA James Webb Space Telescope. The data were obtained from the Mikulski Archive for Space Telescopes at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127 for JWST. These observations are associated with program Nos. 1243 and 1895. The specific observations analyzed can be accessed via doi:10.17909/4xx0-zj76. Funded by the European Union (ERC, AGENTS, 101076224). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Research Council. Neither the European Union nor the granting authority can be held responsible for them. R.P.N. acknowledges funding from JWST programs GO-1933 and GO-2279. Support for this work for R.P.N. was provided by NASA through the NASA Hubble Fellowship grant HST-HF2-51515.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. Support for this work for G.I. was provided by NASA through grant JWST-GO-01895 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. This work has received funding from the Swiss State Secretariat for Education, Research and Innovation (SERI) under contract No. MB22.00072, as well as from the Swiss National Science Foundation (SNSF) through project grant 200020_207349. The Cosmic Dawn Center (DAWN) is funded by the Danish National Research Foundation under grant No. 140.\r\nFacility: JWST - James Webb Space Telescope, HST - Hubble Space Telescope satellite\r\nSoftware:​​​​​​​ Python, matplotlib (Hunter 2007), numpy (Harris et al. 2020), scipy (Virtanen et al. 2020), Astropy (Astropy Collaboration et al. 2013, 2018), Imfit (Erwin 2015).","corr_author":"1","publication":"The Astrophysical Journal","related_material":{"link":[{"description":"News on ISTA website","url":"https://ista.ac.at/en/news/baby-quasars-growing-supermassive-black-holes/","relation":"press_release"}]},"type":"journal_article","isi":1,"department":[{"_id":"JoMa"}],"day":"07","file_date_updated":"2024-03-25T09:31:58Z","date_published":"2024-03-07T00:00:00Z","intvolume":"       963","file":[{"relation":"main_file","date_updated":"2024-03-25T09:31:58Z","success":1,"date_created":"2024-03-25T09:31:58Z","checksum":"dc7af4694f9f94a551417ab49fa43edf","creator":"dernst","file_id":"15184","content_type":"application/pdf","access_level":"open_access","file_size":6047536,"file_name":"2024_AstrophysicalJourn_Matthee.pdf"}],"publication_status":"published"},{"quality_controlled":"1","_id":"13449","article_processing_charge":"No","oa":1,"external_id":{"arxiv":["2301.13611"]},"date_created":"2023-08-03T10:09:57Z","status":"public","citation":{"apa":"Geen, S., Agrawal, P., Crowther, P. A., Keller, B. W., de Koter, A., Keszthelyi, Z., … Winch, E. (2023). Bringing stellar evolution and feedback together: Summary of proposals from the Lorentz Center workshop. <i>Publications of the Astronomical Society of the Pacific</i>. IOP Publishing. <a href=\"https://doi.org/10.1088/1538-3873/acb6b5\">https://doi.org/10.1088/1538-3873/acb6b5</a>","ama":"Geen S, Agrawal P, Crowther PA, et al. Bringing stellar evolution and feedback together: Summary of proposals from the Lorentz Center workshop. <i>Publications of the Astronomical Society of the Pacific</i>. 2023;135(1044). doi:<a href=\"https://doi.org/10.1088/1538-3873/acb6b5\">10.1088/1538-3873/acb6b5</a>","ieee":"S. Geen <i>et al.</i>, “Bringing stellar evolution and feedback together: Summary of proposals from the Lorentz Center workshop,” <i>Publications of the Astronomical Society of the Pacific</i>, vol. 135, no. 1044. IOP Publishing, 2023.","mla":"Geen, Sam, et al. “Bringing Stellar Evolution and Feedback Together: Summary of Proposals from the Lorentz Center Workshop.” <i>Publications of the Astronomical Society of the Pacific</i>, vol. 135, no. 1044, 021001, IOP Publishing, 2023, doi:<a href=\"https://doi.org/10.1088/1538-3873/acb6b5\">10.1088/1538-3873/acb6b5</a>.","chicago":"Geen, Sam, Poojan Agrawal, Paul A. Crowther, B. W. Keller, Alex de Koter, Zsolt Keszthelyi, Freeke van de Voort, et al. “Bringing Stellar Evolution and Feedback Together: Summary of Proposals from the Lorentz Center Workshop.” <i>Publications of the Astronomical Society of the Pacific</i>. IOP Publishing, 2023. <a href=\"https://doi.org/10.1088/1538-3873/acb6b5\">https://doi.org/10.1088/1538-3873/acb6b5</a>.","ista":"Geen S, Agrawal P, Crowther PA, Keller BW, de Koter A, Keszthelyi Z, van de Voort F, Ali AA, Backs F, Bonne L, Brugaletta V, Derkink A, Ekström S, Fichtner YA, Grassitelli L, Götberg YLL, Higgins ER, Laplace E, You Liow K, Lorenzo M, McLeod AF, Meynet G, Newsome M, André Oliva G, Ramachandran V, Rey MP, Rieder S, Romano-Díaz E, Sabhahit G, Sander AAC, Sarwar R, Stinshoff H, Stoop M, Szécsi D, Trebitsch M, Vink JS, Winch E. 2023. Bringing stellar evolution and feedback together: Summary of proposals from the Lorentz Center workshop. Publications of the Astronomical Society of the Pacific. 135(1044), 021001.","short":"S. Geen, P. Agrawal, P.A. Crowther, B.W. Keller, A. de Koter, Z. Keszthelyi, F. van de Voort, A.A. Ali, F. Backs, L. Bonne, V. Brugaletta, A. Derkink, S. Ekström, Y.A. Fichtner, L. Grassitelli, Y.L.L. Götberg, E.R. Higgins, E. Laplace, K. You Liow, M. Lorenzo, A.F. McLeod, G. Meynet, M. Newsome, G. André Oliva, V. Ramachandran, M.P. Rey, S. Rieder, E. Romano-Díaz, G. Sabhahit, A.A.C. Sander, R. Sarwar, H. Stinshoff, M. Stoop, D. Szécsi, M. Trebitsch, J.S. Vink, E. Winch, Publications of the Astronomical Society of the Pacific 135 (2023)."},"issue":"1044","month":"03","language":[{"iso":"eng"}],"volume":135,"doi":"10.1088/1538-3873/acb6b5","publisher":"IOP Publishing","title":"Bringing stellar evolution and feedback together: Summary of proposals from the Lorentz Center workshop","keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"abstract":[{"text":"Stars strongly impact their environment, and shape structures on all scales throughout the universe, in a process known as \"feedback.\" Due to the complexity of both stellar evolution and the physics of larger astrophysical structures, there remain many unanswered questions about how feedback operates and what we can learn about stars by studying their imprint on the wider universe. In this white paper, we summarize discussions from the Lorentz Center meeting \"Bringing Stellar Evolution and Feedback Together\" in 2022 April and identify key areas where further dialog can bring about radical changes in how we view the relationship between stars and the universe they live in.","lang":"eng"}],"extern":"1","scopus_import":"1","year":"2023","date_published":"2023-03-09T00:00:00Z","day":"09","type":"journal_article","publication_status":"published","intvolume":"       135","publication_identifier":{"eissn":["1538-3873"],"issn":["0004-6280"]},"author":[{"first_name":"Sam","full_name":"Geen, Sam","last_name":"Geen"},{"last_name":"Agrawal","full_name":"Agrawal, Poojan","first_name":"Poojan"},{"full_name":"Crowther, Paul A.","first_name":"Paul A.","last_name":"Crowther"},{"last_name":"Keller","first_name":"B. W.","full_name":"Keller, B. W."},{"last_name":"de Koter","first_name":"Alex","full_name":"de Koter, Alex"},{"last_name":"Keszthelyi","full_name":"Keszthelyi, Zsolt","first_name":"Zsolt"},{"last_name":"van de Voort","first_name":"Freeke","full_name":"van de Voort, Freeke"},{"first_name":"Ahmad A.","full_name":"Ali, Ahmad A.","last_name":"Ali"},{"last_name":"Backs","full_name":"Backs, Frank","first_name":"Frank"},{"first_name":"Lars","full_name":"Bonne, Lars","last_name":"Bonne"},{"last_name":"Brugaletta","full_name":"Brugaletta, Vittoria","first_name":"Vittoria"},{"first_name":"Annelotte","full_name":"Derkink, Annelotte","last_name":"Derkink"},{"last_name":"Ekström","first_name":"Sylvia","full_name":"Ekström, Sylvia"},{"full_name":"Fichtner, Yvonne A.","first_name":"Yvonne A.","last_name":"Fichtner"},{"last_name":"Grassitelli","full_name":"Grassitelli, Luca","first_name":"Luca"},{"id":"d0648d0c-0f64-11ee-a2e0-dd0faa2e4f7d","last_name":"Götberg","orcid":"0000-0002-6960-6911","full_name":"Götberg, Ylva Louise Linsdotter","first_name":"Ylva Louise Linsdotter"},{"last_name":"Higgins","full_name":"Higgins, Erin R.","first_name":"Erin R."},{"last_name":"Laplace","full_name":"Laplace, Eva","first_name":"Eva"},{"last_name":"You Liow","full_name":"You Liow, Kong","first_name":"Kong"},{"last_name":"Lorenzo","first_name":"Marta","full_name":"Lorenzo, Marta"},{"first_name":"Anna F.","full_name":"McLeod, Anna F.","last_name":"McLeod"},{"first_name":"Georges","full_name":"Meynet, Georges","last_name":"Meynet"},{"last_name":"Newsome","full_name":"Newsome, Megan","first_name":"Megan"},{"full_name":"André Oliva, G.","first_name":"G.","last_name":"André Oliva"},{"last_name":"Ramachandran","first_name":"Varsha","full_name":"Ramachandran, Varsha"},{"full_name":"Rey, Martin P.","first_name":"Martin P.","last_name":"Rey"},{"first_name":"Steven","full_name":"Rieder, Steven","last_name":"Rieder"},{"last_name":"Romano-Díaz","first_name":"Emilio","full_name":"Romano-Díaz, Emilio"},{"first_name":"Gautham","full_name":"Sabhahit, Gautham","last_name":"Sabhahit"},{"last_name":"Sander","full_name":"Sander, Andreas A. C.","first_name":"Andreas A. C."},{"last_name":"Sarwar","full_name":"Sarwar, Rafia","first_name":"Rafia"},{"first_name":"Hanno","full_name":"Stinshoff, Hanno","last_name":"Stinshoff"},{"first_name":"Mitchel","full_name":"Stoop, Mitchel","last_name":"Stoop"},{"last_name":"Szécsi","first_name":"Dorottya","full_name":"Szécsi, Dorottya"},{"full_name":"Trebitsch, Maxime","first_name":"Maxime","last_name":"Trebitsch"},{"full_name":"Vink, Jorick S.","first_name":"Jorick S.","last_name":"Vink"},{"first_name":"Ethan","full_name":"Winch, Ethan","last_name":"Winch"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_number":"021001","article_type":"original","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1088/1538-3873/acb6b5"}],"arxiv":1,"oa_version":"Published Version","publication":"Publications of the Astronomical Society of the Pacific","date_updated":"2023-08-21T12:09:14Z"},{"intvolume":"       943","publication_status":"published","type":"journal_article","day":"20","date_published":"2023-01-20T00:00:00Z","date_updated":"2023-08-21T12:07:05Z","publication":"The Astrophysical Journal","main_file_link":[{"url":"https://doi.org/10.3847/1538-4357/aca655","open_access":"1"}],"arxiv":1,"oa_version":"Published Version","article_type":"original","article_number":"18","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"full_name":"O‘Grady, Anna J. G.","first_name":"Anna J. G.","last_name":"O‘Grady"},{"last_name":"Drout","full_name":"Drout, Maria R.","first_name":"Maria R."},{"last_name":"Gaensler","full_name":"Gaensler, B. M.","first_name":"B. M."},{"full_name":"Kochanek, C. S.","first_name":"C. S.","last_name":"Kochanek"},{"first_name":"Kathryn F.","full_name":"Neugent, Kathryn F.","last_name":"Neugent"},{"last_name":"Doherty","full_name":"Doherty, Carolyn L.","first_name":"Carolyn L."},{"last_name":"Speagle","first_name":"Joshua S.","full_name":"Speagle, Joshua S."},{"last_name":"Shappee","full_name":"Shappee, B. J.","first_name":"B. J."},{"full_name":"Rauch, Michael","first_name":"Michael","last_name":"Rauch"},{"last_name":"Götberg","orcid":"0000-0002-6960-6911","id":"d0648d0c-0f64-11ee-a2e0-dd0faa2e4f7d","full_name":"Götberg, Ylva Louise Linsdotter","first_name":"Ylva Louise Linsdotter"},{"full_name":"Ludwig, Bethany","first_name":"Bethany","last_name":"Ludwig"},{"last_name":"Thompson","full_name":"Thompson, Todd A.","first_name":"Todd A."}],"publication_identifier":{"eissn":["1538-4357"],"issn":["0004-637X"]},"doi":"10.3847/1538-4357/aca655","volume":943,"language":[{"iso":"eng"}],"month":"01","citation":{"short":"A.J.G. O‘Grady, M.R. Drout, B.M. Gaensler, C.S. Kochanek, K.F. Neugent, C.L. Doherty, J.S. Speagle, B.J. Shappee, M. Rauch, Y.L.L. Götberg, B. Ludwig, T.A. Thompson, The Astrophysical Journal 943 (2023).","ista":"O‘Grady AJG, Drout MR, Gaensler BM, Kochanek CS, Neugent KF, Doherty CL, Speagle JS, Shappee BJ, Rauch M, Götberg YLL, Ludwig B, Thompson TA. 2023. Cool, luminous, and highly variable stars in the Magellanic Clouds. II. Spectroscopic and environmental analysis of Thorne–Żytkow object and super-AGB star candidates. The Astrophysical Journal. 943(1), 18.","chicago":"O‘Grady, Anna J. G., Maria R. Drout, B. M. Gaensler, C. S. Kochanek, Kathryn F. Neugent, Carolyn L. Doherty, Joshua S. Speagle, et al. “Cool, Luminous, and Highly Variable Stars in the Magellanic Clouds. II. Spectroscopic and Environmental Analysis of Thorne–Żytkow Object and Super-AGB Star Candidates.” <i>The Astrophysical Journal</i>. American Astronomical Society, 2023. <a href=\"https://doi.org/10.3847/1538-4357/aca655\">https://doi.org/10.3847/1538-4357/aca655</a>.","ama":"O‘Grady AJG, Drout MR, Gaensler BM, et al. Cool, luminous, and highly variable stars in the Magellanic Clouds. II. Spectroscopic and environmental analysis of Thorne–Żytkow object and super-AGB star candidates. <i>The Astrophysical Journal</i>. 2023;943(1). doi:<a href=\"https://doi.org/10.3847/1538-4357/aca655\">10.3847/1538-4357/aca655</a>","ieee":"A. J. G. O‘Grady <i>et al.</i>, “Cool, luminous, and highly variable stars in the Magellanic Clouds. II. Spectroscopic and environmental analysis of Thorne–Żytkow object and super-AGB star candidates,” <i>The Astrophysical Journal</i>, vol. 943, no. 1. American Astronomical Society, 2023.","mla":"O‘Grady, Anna J. G., et al. “Cool, Luminous, and Highly Variable Stars in the Magellanic Clouds. II. Spectroscopic and Environmental Analysis of Thorne–Żytkow Object and Super-AGB Star Candidates.” <i>The Astrophysical Journal</i>, vol. 943, no. 1, 18, American Astronomical Society, 2023, doi:<a href=\"https://doi.org/10.3847/1538-4357/aca655\">10.3847/1538-4357/aca655</a>.","apa":"O‘Grady, A. J. G., Drout, M. R., Gaensler, B. M., Kochanek, C. S., Neugent, K. F., Doherty, C. L., … Thompson, T. A. (2023). Cool, luminous, and highly variable stars in the Magellanic Clouds. II. Spectroscopic and environmental analysis of Thorne–Żytkow object and super-AGB star candidates. <i>The Astrophysical Journal</i>. American Astronomical Society. <a href=\"https://doi.org/10.3847/1538-4357/aca655\">https://doi.org/10.3847/1538-4357/aca655</a>"},"issue":"1","status":"public","date_created":"2023-08-03T10:10:12Z","external_id":{"arxiv":["2211.12438"]},"oa":1,"_id":"13450","article_processing_charge":"No","quality_controlled":"1","year":"2023","scopus_import":"1","extern":"1","abstract":[{"lang":"eng","text":"In previous work, we identified a population of 38 cool and luminous variable stars in the Magellanic Clouds and examined 11 in detail in order to classify them as either Thorne–Żytkow objects (TŻOs; red supergiants with a neutron star cores) or super-asymptotic giant branch (sAGB) stars (the most massive stars that will not undergo core collapse). This population includes HV 2112, a peculiar star previously considered in other works to be either a TŻO or high-mass asymptotic giant branch (AGB) star. Here we continue this investigation, using the kinematic and radio environments and local star formation history of these stars to place constraints on the age of the progenitor systems and the presence of past supernovae. These stars are not associated with regions of recent star formation, and we find no evidence of past supernovae at their locations. Finally, we also assess the presence of heavy elements and lithium in their spectra compared to red supergiants. We find strong absorption in Li and s-process elements compared to RSGs in most of the sample, consistent with sAGB nucleosynthesis, while HV 2112 shows additional strong lines associated with TŻO nucleosynthesis. Coupled with our previous mass estimates, the results are consistent with the stars being massive (∼4–6.5 M⊙) or sAGB (∼6.5–12 M⊙) stars in the thermally pulsing phase, providing crucial observations of the transition between low- and high-mass stellar populations. HV 2112 is more ambiguous; it could either be a maximally massive sAGB star, or a TŻO if the minimum mass for stability extends down to ≲13 M⊙."}],"keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"title":"Cool, luminous, and highly variable stars in the Magellanic Clouds. II. Spectroscopic and environmental analysis of Thorne–Żytkow object and super-AGB star candidates","publisher":"American Astronomical Society"},{"publication_status":"published","intvolume":"       675","date_published":"2023-07-01T00:00:00Z","day":"01","type":"journal_article","publication":"Astronomy & Astrophysics","date_updated":"2023-08-22T11:01:07Z","publication_identifier":{"issn":["0004-6361"],"eissn":["1432-0746"]},"author":[{"last_name":"Vink","first_name":"Jorick S.","full_name":"Vink, Jorick S."},{"last_name":"Mehner","first_name":"A.","full_name":"Mehner, A."},{"last_name":"Crowther","first_name":"P. A.","full_name":"Crowther, P. A."},{"full_name":"Fullerton, A.","first_name":"A.","last_name":"Fullerton"},{"first_name":"M.","full_name":"Garcia, M.","last_name":"Garcia"},{"last_name":"Martins","first_name":"F.","full_name":"Martins, F."},{"last_name":"Morrell","first_name":"N.","full_name":"Morrell, N."},{"full_name":"Oskinova, L. M.","first_name":"L. M.","last_name":"Oskinova"},{"last_name":"St-Louis","full_name":"St-Louis, N.","first_name":"N."},{"full_name":"ud-Doula, A.","first_name":"A.","last_name":"ud-Doula"},{"full_name":"Sander, A. A. C.","first_name":"A. A. C.","last_name":"Sander"},{"first_name":"H.","full_name":"Sana, H.","last_name":"Sana"},{"last_name":"Bouret","first_name":"J.-C.","full_name":"Bouret, J.-C."},{"full_name":"Kubátová, B.","first_name":"B.","last_name":"Kubátová"},{"last_name":"Marchant","full_name":"Marchant, P.","first_name":"P."},{"last_name":"Martins","first_name":"L. P.","full_name":"Martins, L. P."},{"full_name":"Wofford, A.","first_name":"A.","last_name":"Wofford"},{"last_name":"van Loon","first_name":"J. Th.","full_name":"van Loon, J. Th."},{"full_name":"Grace Telford, O.","first_name":"O.","last_name":"Grace Telford"},{"first_name":"Ylva Louise Linsdotter","full_name":"Götberg, Ylva Louise Linsdotter","last_name":"Götberg","orcid":"0000-0002-6960-6911","id":"d0648d0c-0f64-11ee-a2e0-dd0faa2e4f7d"},{"first_name":"D. M.","full_name":"Bowman, D. M.","last_name":"Bowman"},{"last_name":"Erba","full_name":"Erba, C.","first_name":"C."},{"last_name":"Kalari","full_name":"Kalari, V. M.","first_name":"V. M."},{"first_name":"M.","full_name":"Abdul-Masih, M.","last_name":"Abdul-Masih"},{"full_name":"Alkousa, T.","first_name":"T.","last_name":"Alkousa"},{"first_name":"F.","full_name":"Backs, F.","last_name":"Backs"},{"full_name":"Barbosa, C. L.","first_name":"C. L.","last_name":"Barbosa"},{"full_name":"Berlanas, S. R.","first_name":"S. R.","last_name":"Berlanas"},{"full_name":"Bernini-Peron, M.","first_name":"M.","last_name":"Bernini-Peron"},{"last_name":"Bestenlehner","full_name":"Bestenlehner, J. M.","first_name":"J. M."},{"last_name":"Blomme","full_name":"Blomme, R.","first_name":"R."},{"last_name":"Bodensteiner","full_name":"Bodensteiner, J.","first_name":"J."},{"full_name":"Brands, S. A.","first_name":"S. A.","last_name":"Brands"},{"full_name":"Evans, C. J.","first_name":"C. J.","last_name":"Evans"},{"last_name":"David-Uraz","full_name":"David-Uraz, A.","first_name":"A."},{"full_name":"Driessen, F. A.","first_name":"F. A.","last_name":"Driessen"},{"full_name":"Dsilva, K.","first_name":"K.","last_name":"Dsilva"},{"full_name":"Geen, S.","first_name":"S.","last_name":"Geen"},{"full_name":"Gómez-González, V. M. A.","first_name":"V. M. A.","last_name":"Gómez-González"},{"last_name":"Grassitelli","full_name":"Grassitelli, L.","first_name":"L."},{"first_name":"W.-R.","full_name":"Hamann, W.-R.","last_name":"Hamann"},{"last_name":"Hawcroft","full_name":"Hawcroft, C.","first_name":"C."},{"last_name":"Herrero","full_name":"Herrero, A.","first_name":"A."},{"last_name":"Higgins","first_name":"E. R.","full_name":"Higgins, E. R."},{"last_name":"John Hillier","full_name":"John Hillier, D.","first_name":"D."},{"last_name":"Ignace","full_name":"Ignace, R.","first_name":"R."},{"last_name":"Istrate","first_name":"A. G.","full_name":"Istrate, A. G."},{"first_name":"L.","full_name":"Kaper, L.","last_name":"Kaper"},{"last_name":"Kee","first_name":"N. D.","full_name":"Kee, N. D."},{"full_name":"Kehrig, C.","first_name":"C.","last_name":"Kehrig"},{"first_name":"Z.","full_name":"Keszthelyi, Z.","last_name":"Keszthelyi"},{"full_name":"Klencki, J.","first_name":"J.","last_name":"Klencki"},{"last_name":"de Koter","full_name":"de Koter, A.","first_name":"A."},{"last_name":"Kuiper","full_name":"Kuiper, R.","first_name":"R."},{"full_name":"Laplace, E.","first_name":"E.","last_name":"Laplace"},{"last_name":"Larkin","full_name":"Larkin, C. J. K.","first_name":"C. J. K."},{"full_name":"Lefever, R. R.","first_name":"R. R.","last_name":"Lefever"},{"first_name":"C.","full_name":"Leitherer, C.","last_name":"Leitherer"},{"first_name":"D. J.","full_name":"Lennon, D. J.","last_name":"Lennon"},{"last_name":"Mahy","first_name":"L.","full_name":"Mahy, L."},{"first_name":"J.","full_name":"Maíz Apellániz, J.","last_name":"Maíz Apellániz"},{"last_name":"Maravelias","first_name":"G.","full_name":"Maravelias, G."},{"first_name":"W.","full_name":"Marcolino, W.","last_name":"Marcolino"},{"last_name":"McLeod","full_name":"McLeod, A. F.","first_name":"A. F."},{"last_name":"de Mink","first_name":"S. E.","full_name":"de Mink, S. E."},{"last_name":"Najarro","first_name":"F.","full_name":"Najarro, F."},{"full_name":"Oey, M. S.","first_name":"M. S.","last_name":"Oey"},{"full_name":"Parsons, T. N.","first_name":"T. N.","last_name":"Parsons"},{"first_name":"D.","full_name":"Pauli, D.","last_name":"Pauli"},{"first_name":"M. G.","full_name":"Pedersen, M. G.","last_name":"Pedersen"},{"full_name":"Prinja, R. K.","first_name":"R. K.","last_name":"Prinja"},{"last_name":"Ramachandran","first_name":"V.","full_name":"Ramachandran, V."},{"full_name":"Ramírez-Tannus, M. C.","first_name":"M. C.","last_name":"Ramírez-Tannus"},{"full_name":"Sabhahit, G. N.","first_name":"G. N.","last_name":"Sabhahit"},{"last_name":"Schootemeijer","first_name":"A.","full_name":"Schootemeijer, A."},{"full_name":"Reyero Serantes, S.","first_name":"S.","last_name":"Reyero Serantes"},{"first_name":"T.","full_name":"Shenar, T.","last_name":"Shenar"},{"last_name":"Stringfellow","full_name":"Stringfellow, G. S.","first_name":"G. S."},{"last_name":"Sudnik","full_name":"Sudnik, N.","first_name":"N."},{"first_name":"F.","full_name":"Tramper, F.","last_name":"Tramper"},{"full_name":"Wang, L.","first_name":"L.","last_name":"Wang"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_number":"A154","article_type":"original","main_file_link":[{"url":"https://doi.org/10.1051/0004-6361/202245650","open_access":"1"}],"oa_version":"Published Version","arxiv":1,"date_created":"2023-08-21T10:12:35Z","status":"public","citation":{"ama":"Vink JS, Mehner A, Crowther PA, et al. X-shooting ULLYSES: Massive stars at low metallicity. I. Project description. <i>Astronomy &#38; Astrophysics</i>. 2023;675. doi:<a href=\"https://doi.org/10.1051/0004-6361/202245650\">10.1051/0004-6361/202245650</a>","ieee":"J. S. Vink <i>et al.</i>, “X-shooting ULLYSES: Massive stars at low metallicity. I. Project description,” <i>Astronomy &#38; Astrophysics</i>, vol. 675. EDP Sciences, 2023.","mla":"Vink, Jorick S., et al. “X-Shooting ULLYSES: Massive Stars at Low Metallicity. I. Project Description.” <i>Astronomy &#38; Astrophysics</i>, vol. 675, A154, EDP Sciences, 2023, doi:<a href=\"https://doi.org/10.1051/0004-6361/202245650\">10.1051/0004-6361/202245650</a>.","apa":"Vink, J. S., Mehner, A., Crowther, P. A., Fullerton, A., Garcia, M., Martins, F., … Wang, L. (2023). X-shooting ULLYSES: Massive stars at low metallicity. I. Project description. <i>Astronomy &#38; Astrophysics</i>. EDP Sciences. <a href=\"https://doi.org/10.1051/0004-6361/202245650\">https://doi.org/10.1051/0004-6361/202245650</a>","short":"J.S. Vink, A. Mehner, P.A. Crowther, A. Fullerton, M. Garcia, F. Martins, N. Morrell, L.M. Oskinova, N. St-Louis, A. ud-Doula, A.A.C. Sander, H. Sana, J.-C. Bouret, B. Kubátová, P. Marchant, L.P. Martins, A. Wofford, J.T. van Loon, O. Grace Telford, Y.L.L. Götberg, D.M. Bowman, C. Erba, V.M. Kalari, M. Abdul-Masih, T. Alkousa, F. Backs, C.L. Barbosa, S.R. Berlanas, M. Bernini-Peron, J.M. Bestenlehner, R. Blomme, J. Bodensteiner, S.A. Brands, C.J. Evans, A. David-Uraz, F.A. Driessen, K. Dsilva, S. Geen, V.M.A. Gómez-González, L. Grassitelli, W.-R. Hamann, C. Hawcroft, A. Herrero, E.R. Higgins, D. John Hillier, R. Ignace, A.G. Istrate, L. Kaper, N.D. Kee, C. Kehrig, Z. Keszthelyi, J. Klencki, A. de Koter, R. Kuiper, E. Laplace, C.J.K. Larkin, R.R. Lefever, C. Leitherer, D.J. Lennon, L. Mahy, J. Maíz Apellániz, G. Maravelias, W. Marcolino, A.F. McLeod, S.E. de Mink, F. Najarro, M.S. Oey, T.N. Parsons, D. Pauli, M.G. Pedersen, R.K. Prinja, V. Ramachandran, M.C. Ramírez-Tannus, G.N. Sabhahit, A. Schootemeijer, S. Reyero Serantes, T. Shenar, G.S. Stringfellow, N. Sudnik, F. Tramper, L. Wang, Astronomy &#38; Astrophysics 675 (2023).","ista":"Vink JS, Mehner A, Crowther PA, Fullerton A, Garcia M, Martins F, Morrell N, Oskinova LM, St-Louis N, ud-Doula A, Sander AAC, Sana H, Bouret J-C, Kubátová B, Marchant P, Martins LP, Wofford A, van Loon JT, Grace Telford O, Götberg YLL, Bowman DM, Erba C, Kalari VM, Abdul-Masih M, Alkousa T, Backs F, Barbosa CL, Berlanas SR, Bernini-Peron M, Bestenlehner JM, Blomme R, Bodensteiner J, Brands SA, Evans CJ, David-Uraz A, Driessen FA, Dsilva K, Geen S, Gómez-González VMA, Grassitelli L, Hamann W-R, Hawcroft C, Herrero A, Higgins ER, John Hillier D, Ignace R, Istrate AG, Kaper L, Kee ND, Kehrig C, Keszthelyi Z, Klencki J, de Koter A, Kuiper R, Laplace E, Larkin CJK, Lefever RR, Leitherer C, Lennon DJ, Mahy L, Maíz Apellániz J, Maravelias G, Marcolino W, McLeod AF, de Mink SE, Najarro F, Oey MS, Parsons TN, Pauli D, Pedersen MG, Prinja RK, Ramachandran V, Ramírez-Tannus MC, Sabhahit GN, Schootemeijer A, Reyero Serantes S, Shenar T, Stringfellow GS, Sudnik N, Tramper F, Wang L. 2023. X-shooting ULLYSES: Massive stars at low metallicity. I. Project description. Astronomy &#38; Astrophysics. 675, A154.","chicago":"Vink, Jorick S., A. Mehner, P. A. Crowther, A. Fullerton, M. Garcia, F. Martins, N. Morrell, et al. “X-Shooting ULLYSES: Massive Stars at Low Metallicity. I. Project Description.” <i>Astronomy &#38; Astrophysics</i>. EDP Sciences, 2023. <a href=\"https://doi.org/10.1051/0004-6361/202245650\">https://doi.org/10.1051/0004-6361/202245650</a>."},"month":"07","language":[{"iso":"eng"}],"volume":675,"doi":"10.1051/0004-6361/202245650","quality_controlled":"1","_id":"14103","article_processing_charge":"No","oa":1,"external_id":{"arxiv":["2305.06376"]},"extern":"1","scopus_import":"1","year":"2023","publisher":"EDP Sciences","title":"X-shooting ULLYSES: Massive stars at low metallicity. I. Project description","keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"abstract":[{"lang":"eng","text":"Observations of individual massive stars, super-luminous supernovae, gamma-ray bursts, and gravitational wave events involving spectacular black hole mergers indicate that the low-metallicity Universe is fundamentally different from our own Galaxy. Many transient phenomena will remain enigmatic until we achieve a firm understanding of the physics and evolution of massive stars at low metallicity (Z). The Hubble Space Telescope has devoted 500 orbits to observing ∼250 massive stars at low Z in the ultraviolet (UV) with the COS and STIS spectrographs under the ULLYSES programme. The complementary X-Shooting ULLYSES (XShootU) project provides an enhanced legacy value with high-quality optical and near-infrared spectra obtained with the wide-wavelength coverage X-shooter spectrograph at ESO’s Very Large Telescope. We present an overview of the XShootU project, showing that combining ULLYSES UV and XShootU optical spectra is critical for the uniform determination of stellar parameters such as effective temperature, surface gravity, luminosity, and abundances, as well as wind properties such as mass-loss rates as a function of Z. As uncertainties in stellar and wind parameters percolate into many adjacent areas of astrophysics, the data and modelling of the XShootU project is expected to be a game changer for our physical understanding of massive stars at low Z. To be able to confidently interpret James Webb Space Telescope spectra of the first stellar generations, the individual spectra of low-Z stars need to be understood, which is exactly where XShootU can deliver."}]},{"title":"Observational predictions for Thorne–Żytkow objects","publisher":"Oxford University Press","keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"abstract":[{"lang":"eng","text":"Thorne–Żytkow objects (TŻO) are potential end products of the merger of a neutron star with a non-degenerate star. In this work, we have computed the first grid of evolutionary models of TŻOs with the MESA stellar evolution code. With these models, we predict several observational properties of TŻOs, including their surface temperatures and luminosities, pulsation periods, and nucleosynthetic products. We expand the range of possible TŻO solutions to cover 3.45≲log(Teff/K)≲3.65 and 4.85≲log(L/L⊙)≲5.5⁠. Due to the much higher densities our TŻOs reach compared to previous models, if TŻOs form we expect them to be stable over a larger mass range than previously predicted, without exhibiting a gap in their mass distribution. Using the GYRE stellar pulsation code we show that TŻOs should have fundamental pulsation periods of 1000–2000 d, and period ratios of ≈0.2–0.3. Models computed with a large 399 isotope fully coupled nuclear network show a nucleosynthetic signal that is different to previously predicted. We propose a new nucleosynthetic signal to determine a star’s status as a TŻO: the isotopologues 44TiO2 and 44TiO⁠, which will have a shift in their spectral features as compared to stable titanium-containing molecules. We find that in the local Universe (∼SMC metallicities and above) TŻOs show little heavy metal enrichment, potentially explaining the difficulty in finding TŻOs to-date."}],"scopus_import":"1","year":"2023","extern":"1","quality_controlled":"1","_id":"14104","article_processing_charge":"No","external_id":{"arxiv":["2305.07337"]},"oa":1,"issue":"2","citation":{"ama":"Farmer R, Renzo M, Götberg YLL, Bellinger E, Justham S, de Mink SE. Observational predictions for Thorne–Żytkow objects. <i>Monthly Notices of the Royal Astronomical Society</i>. 2023;524(2):1692-1709. doi:<a href=\"https://doi.org/10.1093/mnras/stad1977\">10.1093/mnras/stad1977</a>","mla":"Farmer, R., et al. “Observational Predictions for Thorne–Żytkow Objects.” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 524, no. 2, Oxford University Press, 2023, pp. 1692–709, doi:<a href=\"https://doi.org/10.1093/mnras/stad1977\">10.1093/mnras/stad1977</a>.","ieee":"R. Farmer, M. Renzo, Y. L. L. Götberg, E. Bellinger, S. Justham, and S. E. de Mink, “Observational predictions for Thorne–Żytkow objects,” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 524, no. 2. Oxford University Press, pp. 1692–1709, 2023.","apa":"Farmer, R., Renzo, M., Götberg, Y. L. L., Bellinger, E., Justham, S., &#38; de Mink, S. E. (2023). Observational predictions for Thorne–Żytkow objects. <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press. <a href=\"https://doi.org/10.1093/mnras/stad1977\">https://doi.org/10.1093/mnras/stad1977</a>","short":"R. Farmer, M. Renzo, Y.L.L. Götberg, E. Bellinger, S. Justham, S.E. de Mink, Monthly Notices of the Royal Astronomical Society 524 (2023) 1692–1709.","ista":"Farmer R, Renzo M, Götberg YLL, Bellinger E, Justham S, de Mink SE. 2023. Observational predictions for Thorne–Żytkow objects. Monthly Notices of the Royal Astronomical Society. 524(2), 1692–1709.","chicago":"Farmer, R, M Renzo, Ylva Louise Linsdotter Götberg, E Bellinger, S Justham, and S E de Mink. “Observational Predictions for Thorne–Żytkow Objects.” <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press, 2023. <a href=\"https://doi.org/10.1093/mnras/stad1977\">https://doi.org/10.1093/mnras/stad1977</a>."},"month":"09","date_created":"2023-08-21T10:13:56Z","status":"public","doi":"10.1093/mnras/stad1977","language":[{"iso":"eng"}],"volume":524,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"full_name":"Farmer, R","first_name":"R","last_name":"Farmer"},{"last_name":"Renzo","full_name":"Renzo, M","first_name":"M"},{"id":"d0648d0c-0f64-11ee-a2e0-dd0faa2e4f7d","last_name":"Götberg","orcid":"0000-0002-6960-6911","full_name":"Götberg, Ylva Louise Linsdotter","first_name":"Ylva Louise Linsdotter"},{"last_name":"Bellinger","first_name":"E","full_name":"Bellinger, E"},{"last_name":"Justham","first_name":"S","full_name":"Justham, S"},{"last_name":"de Mink","full_name":"de Mink, S E","first_name":"S E"}],"publication_identifier":{"eissn":["1365-2966"],"issn":["0035-8711"]},"main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2305.07337"}],"arxiv":1,"oa_version":"Preprint","article_type":"original","publication":"Monthly Notices of the Royal Astronomical Society","date_updated":"2023-08-21T12:12:48Z","date_published":"2023-09-01T00:00:00Z","page":"1692-1709","type":"journal_article","day":"01","intvolume":"       524","publication_status":"published"},{"keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"abstract":[{"lang":"eng","text":"We report on IXPE, NICER, and XMM–Newton observations of the magnetar 1E 2259+586. We find that the source is significantly polarized at about or above 20  per cent for all phases except for the secondary peak where it is more weakly polarized. The polarization degree is strongest during the primary minimum which is also the phase where an absorption feature has been identified previously. The polarization angle of the photons are consistent with a rotating vector model with a mode switch between the primary minimum and the rest of the rotation of the neutron star. We propose a scenario in which the emission at the source is weakly polarized (as in a condensed surface) and, as the radiation passes through a plasma arch, resonant cyclotron scattering off of protons produces the observed polarized radiation. This confirms the magnetar nature of the source with a surface field greater than about 1015 G."}],"title":"The detection of polarized X-ray emission from the magnetar 1E 2259+586","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)"},"publisher":"Oxford University Press","scopus_import":"1","year":"2023","extern":"1","external_id":{"arxiv":["2311.03637"]},"oa":1,"_id":"15190","article_processing_charge":"No","quality_controlled":"1","doi":"10.1093/mnras/stad3680","language":[{"iso":"eng"}],"volume":527,"citation":{"ieee":"J. Heyl <i>et al.</i>, “The detection of polarized X-ray emission from the magnetar 1E 2259+586,” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 527, no. 4. Oxford University Press, pp. 12219–12231, 2023.","mla":"Heyl, Jeremy, et al. “The Detection of Polarized X-Ray Emission from the Magnetar 1E 2259+586.” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 527, no. 4, Oxford University Press, 2023, pp. 12219–31, doi:<a href=\"https://doi.org/10.1093/mnras/stad3680\">10.1093/mnras/stad3680</a>.","ama":"Heyl J, Taverna R, Turolla R, et al. The detection of polarized X-ray emission from the magnetar 1E 2259+586. <i>Monthly Notices of the Royal Astronomical Society</i>. 2023;527(4):12219-12231. doi:<a href=\"https://doi.org/10.1093/mnras/stad3680\">10.1093/mnras/stad3680</a>","apa":"Heyl, J., Taverna, R., Turolla, R., Israel, G. L., Ng, M., Kırmızıbayrak, D., … Xie, F. (2023). The detection of polarized X-ray emission from the magnetar 1E 2259+586. <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press. <a href=\"https://doi.org/10.1093/mnras/stad3680\">https://doi.org/10.1093/mnras/stad3680</a>","short":"J. Heyl, R. Taverna, R. Turolla, G.L. Israel, M. Ng, D. Kırmızıbayrak, D. González-Caniulef, I. Caiazzo, S. Zane, S.R. Ehlert, M. Negro, I. Agudo, L.A. Antonelli, M. Bachetti, L. Baldini, W.H. Baumgartner, R. Bellazzini, S. Bianchi, S.D. Bongiorno, R. Bonino, A. Brez, N. Bucciantini, F. Capitanio, S. Castellano, E. Cavazzuti, C.-T. Chen, S. Ciprini, E. Costa, A. De Rosa, E. Del Monte, L. Di Gesu, N. Di Lalla, A. Di Marco, I. Donnarumma, V. Doroshenko, M. Dovčiak, T. Enoto, Y. Evangelista, S. Fabiani, R. Ferrazzoli, J.A. Garcia, S. Gunji, K. Hayashida, W. Iwakiri, S.G. Jorstad, P. Kaaret, V. Karas, F. Kislat, T. Kitaguchi, J.J. Kolodziejczak, H. Krawczynski, F.L. Monaca, L. Latronico, I. Liodakis, S. Maldera, A. Manfreda, F. Marin, A. Marinucci, A.P. Marscher, H.L. Marshall, F. Massaro, G. Matt, I. Mitsuishi, T. Mizuno, F. Muleri, C.-Y. Ng, S.L. O’Dell, N. Omodei, C. Oppedisano, A. Papitto, G.G. Pavlov, A.L. Peirson, M. Perri, M. Pesce-Rollins, P.-O. Petrucci, M. Pilia, A. Possenti, J. Poutanen, S. Puccetti, B.D. Ramsey, J. Rankin, A. Ratheesh, O.J. Roberts, R.W. Romani, C. Sgrò, P. Slane, P. Soffitta, G. Spandre, D.A. Swartz, T. Tamagawa, F. Tavecchio, Y. Tawara, A.F. Tennant, N.E. Thomas, F. Tombesi, A. Trois, S.S. Tsygankov, J. Vink, M.C. Weisskopf, K. Wu, F. Xie, Monthly Notices of the Royal Astronomical Society 527 (2023) 12219–12231.","chicago":"Heyl, Jeremy, Roberto Taverna, Roberto Turolla, Gian Luca Israel, Mason Ng, Demet Kırmızıbayrak, Denis González-Caniulef, et al. “The Detection of Polarized X-Ray Emission from the Magnetar 1E 2259+586.” <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press, 2023. <a href=\"https://doi.org/10.1093/mnras/stad3680\">https://doi.org/10.1093/mnras/stad3680</a>.","ista":"Heyl J et al. 2023. The detection of polarized X-ray emission from the magnetar 1E 2259+586. Monthly Notices of the Royal Astronomical Society. 527(4), 12219–12231."},"issue":"4","month":"12","date_created":"2024-03-26T09:44:24Z","status":"public","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1093/mnras/stad3680"}],"oa_version":"Published Version","arxiv":1,"article_type":"original","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publication_identifier":{"issn":["0035-8711"],"eissn":["1365-2966"]},"author":[{"last_name":"Heyl","full_name":"Heyl, Jeremy","first_name":"Jeremy"},{"last_name":"Taverna","full_name":"Taverna, Roberto","first_name":"Roberto"},{"first_name":"Roberto","full_name":"Turolla, Roberto","last_name":"Turolla"},{"last_name":"Israel","full_name":"Israel, Gian Luca","first_name":"Gian Luca"},{"full_name":"Ng, Mason","first_name":"Mason","last_name":"Ng"},{"last_name":"Kırmızıbayrak","first_name":"Demet","full_name":"Kırmızıbayrak, Demet"},{"full_name":"González-Caniulef, 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Stefano","last_name":"Bianchi"},{"last_name":"Bongiorno","first_name":"Stephen D","full_name":"Bongiorno, Stephen D"},{"last_name":"Bonino","full_name":"Bonino, Raffaella","first_name":"Raffaella"},{"last_name":"Brez","first_name":"Alessandro","full_name":"Brez, Alessandro"},{"last_name":"Bucciantini","full_name":"Bucciantini, Niccolò","first_name":"Niccolò"},{"first_name":"Fiamma","full_name":"Capitanio, Fiamma","last_name":"Capitanio"},{"full_name":"Castellano, Simone","first_name":"Simone","last_name":"Castellano"},{"last_name":"Cavazzuti","full_name":"Cavazzuti, Elisabetta","first_name":"Elisabetta"},{"full_name":"Chen, Chien-Ting","first_name":"Chien-Ting","last_name":"Chen"},{"last_name":"Ciprini","first_name":"Stefano","full_name":"Ciprini, Stefano"},{"last_name":"Costa","first_name":"Enrico","full_name":"Costa, Enrico"},{"last_name":"De Rosa","full_name":"De Rosa, Alessandra","first_name":"Alessandra"},{"last_name":"Del Monte","full_name":"Del Monte, Ettore","first_name":"Ettore"},{"last_name":"Di Gesu","first_name":"Laura","full_name":"Di Gesu, Laura"},{"first_name":"Niccolò","full_name":"Di Lalla, Niccolò","last_name":"Di Lalla"},{"last_name":"Di Marco","full_name":"Di Marco, Alessandro","first_name":"Alessandro"},{"last_name":"Donnarumma","first_name":"Immacolata","full_name":"Donnarumma, Immacolata"},{"full_name":"Doroshenko, Victor","first_name":"Victor","last_name":"Doroshenko"},{"full_name":"Dovčiak, Michal","first_name":"Michal","last_name":"Dovčiak"},{"last_name":"Enoto","full_name":"Enoto, Teruaki","first_name":"Teruaki"},{"full_name":"Evangelista, Yuri","first_name":"Yuri","last_name":"Evangelista"},{"last_name":"Fabiani","first_name":"Sergio","full_name":"Fabiani, Sergio"},{"full_name":"Ferrazzoli, Riccardo","first_name":"Riccardo","last_name":"Ferrazzoli"},{"full_name":"Garcia, Javier A","first_name":"Javier A","last_name":"Garcia"},{"last_name":"Gunji","full_name":"Gunji, 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L","last_name":"O’Dell"},{"full_name":"Omodei, Nicola","first_name":"Nicola","last_name":"Omodei"},{"last_name":"Oppedisano","first_name":"Chiara","full_name":"Oppedisano, Chiara"},{"last_name":"Papitto","full_name":"Papitto, Alessandro","first_name":"Alessandro"},{"first_name":"George G","full_name":"Pavlov, George G","last_name":"Pavlov"},{"full_name":"Peirson, Abel Lawrence","first_name":"Abel Lawrence","last_name":"Peirson"},{"full_name":"Perri, Matteo","first_name":"Matteo","last_name":"Perri"},{"last_name":"Pesce-Rollins","full_name":"Pesce-Rollins, Melissa","first_name":"Melissa"},{"full_name":"Petrucci, Pierre-Olivier","first_name":"Pierre-Olivier","last_name":"Petrucci"},{"full_name":"Pilia, Maura","first_name":"Maura","last_name":"Pilia"},{"full_name":"Possenti, Andrea","first_name":"Andrea","last_name":"Possenti"},{"first_name":"Juri","full_name":"Poutanen, Juri","last_name":"Poutanen"},{"full_name":"Puccetti, Simonetta","first_name":"Simonetta","last_name":"Puccetti"},{"last_name":"Ramsey","first_name":"Brian D","full_name":"Ramsey, Brian D"},{"last_name":"Rankin","first_name":"John","full_name":"Rankin, John"},{"first_name":"Ajay","full_name":"Ratheesh, Ajay","last_name":"Ratheesh"},{"first_name":"Oliver J","full_name":"Roberts, Oliver J","last_name":"Roberts"},{"last_name":"Romani","first_name":"Roger W","full_name":"Romani, Roger W"},{"last_name":"Sgrò","first_name":"Carmelo","full_name":"Sgrò, Carmelo"},{"full_name":"Slane, Patrick","first_name":"Patrick","last_name":"Slane"},{"last_name":"Soffitta","full_name":"Soffitta, Paolo","first_name":"Paolo"},{"last_name":"Spandre","first_name":"Gloria","full_name":"Spandre, Gloria"},{"last_name":"Swartz","first_name":"Douglas A","full_name":"Swartz, Douglas A"},{"full_name":"Tamagawa, Toru","first_name":"Toru","last_name":"Tamagawa"},{"last_name":"Tavecchio","full_name":"Tavecchio, Fabrizio","first_name":"Fabrizio"},{"last_name":"Tawara","first_name":"Yuzuru","full_name":"Tawara, Yuzuru"},{"first_name":"Allyn F","full_name":"Tennant, Allyn F","last_name":"Tennant"},{"last_name":"Thomas","first_name":"Nicholas E","full_name":"Thomas, Nicholas E"},{"full_name":"Tombesi, Francesco","first_name":"Francesco","last_name":"Tombesi"},{"last_name":"Trois","full_name":"Trois, Alessio","first_name":"Alessio"},{"full_name":"Tsygankov, Sergey S","first_name":"Sergey S","last_name":"Tsygankov"},{"first_name":"Jacco","full_name":"Vink, Jacco","last_name":"Vink"},{"full_name":"Weisskopf, Martin C","first_name":"Martin C","last_name":"Weisskopf"},{"last_name":"Wu","first_name":"Kinwah","full_name":"Wu, Kinwah"},{"last_name":"Xie","full_name":"Xie, Fei","first_name":"Fei"}],"date_updated":"2024-04-02T06:51:04Z","publication":"Monthly Notices of the Royal Astronomical Society","type":"journal_article","page":"12219-12231","day":"01","date_published":"2023-12-01T00:00:00Z","intvolume":"       527","publication_status":"published"},{"author":[{"first_name":"David R.","full_name":"Miller, David R.","last_name":"Miller"},{"full_name":"Caiazzo, Ilaria","first_name":"Ilaria","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","last_name":"Caiazzo","orcid":"0000-0002-4770-5388"},{"last_name":"Heyl","first_name":"Jeremy","full_name":"Heyl, Jeremy"},{"first_name":"Harvey B.","full_name":"Richer, Harvey B.","last_name":"Richer"},{"first_name":"Kareem","full_name":"El-Badry, Kareem","last_name":"El-Badry"},{"first_name":"Antonio C.","full_name":"Rodriguez, Antonio C.","last_name":"Rodriguez"},{"last_name":"Vanderbosch","full_name":"Vanderbosch, Zachary P.","first_name":"Zachary P."},{"last_name":"van Roestel","first_name":"Jan","full_name":"van Roestel, Jan"}],"publication_identifier":{"eissn":["2041-8213"],"issn":["2041-8205"]},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_type":"original","article_number":"L41","arxiv":1,"oa_version":"Published Version","main_file_link":[{"url":"https://doi.org/10.3847/2041-8213/acffc4","open_access":"1"}],"publication":"The Astrophysical Journal Letters","date_updated":"2024-04-02T06:56:01Z","date_published":"2023-10-19T00:00:00Z","day":"19","type":"journal_article","publication_status":"published","intvolume":"       956","publisher":"American Astronomical Society","title":"An extremely massive white dwarf escaped from the Hyades star cluster","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)"},"keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"abstract":[{"lang":"eng","text":"We searched the Gaia DR3 database for ultramassive white dwarfs with kinematics consistent with having escaped the nearby Hyades open cluster, identifying three such candidates. Two of these candidates have masses estimated from Gaia photometry of approximately 1.1 solar masses; their status as products of single-stellar evolution that have escaped the cluster was deemed too questionable for immediate follow-up analysis. The remaining candidate has an expected mass >1.3 solar masses, significantly reducing the probability of it being an interloper. Analysis of follow-up Gemini GMOS spectroscopy for this source reveals a nonmagnetized hydrogen atmosphere white dwarf with a mass and age consistent with having formed from a single star. Assuming a single-stellar-evolution formation channel, we estimate a 97.8% chance that the candidate is a true escapee from the Hyades. With a determined mass of 1.317 solar masses, this is potentially the most massive known single-evolution white dwarf and is by far the most massive with a strong association with an open cluster."}],"extern":"1","scopus_import":"1","year":"2023","_id":"15192","quality_controlled":"1","article_processing_charge":"No","oa":1,"external_id":{"arxiv":["2310.03204"]},"date_created":"2024-03-26T09:45:38Z","status":"public","citation":{"short":"D.R. Miller, I. Caiazzo, J. Heyl, H.B. Richer, K. El-Badry, A.C. Rodriguez, Z.P. Vanderbosch, J. van Roestel, The Astrophysical Journal Letters 956 (2023).","chicago":"Miller, David R., Ilaria Caiazzo, Jeremy Heyl, Harvey B. Richer, Kareem El-Badry, Antonio C. Rodriguez, Zachary P. Vanderbosch, and Jan van Roestel. “An Extremely Massive White Dwarf Escaped from the Hyades Star Cluster.” <i>The Astrophysical Journal Letters</i>. American Astronomical Society, 2023. <a href=\"https://doi.org/10.3847/2041-8213/acffc4\">https://doi.org/10.3847/2041-8213/acffc4</a>.","ista":"Miller DR, Caiazzo I, Heyl J, Richer HB, El-Badry K, Rodriguez AC, Vanderbosch ZP, van Roestel J. 2023. An extremely massive white dwarf escaped from the Hyades star cluster. The Astrophysical Journal Letters. 956(2), L41.","ieee":"D. R. Miller <i>et al.</i>, “An extremely massive white dwarf escaped from the Hyades star cluster,” <i>The Astrophysical Journal Letters</i>, vol. 956, no. 2. American Astronomical Society, 2023.","mla":"Miller, David R., et al. “An Extremely Massive White Dwarf Escaped from the Hyades Star Cluster.” <i>The Astrophysical Journal Letters</i>, vol. 956, no. 2, L41, American Astronomical Society, 2023, doi:<a href=\"https://doi.org/10.3847/2041-8213/acffc4\">10.3847/2041-8213/acffc4</a>.","ama":"Miller DR, Caiazzo I, Heyl J, et al. An extremely massive white dwarf escaped from the Hyades star cluster. <i>The Astrophysical Journal Letters</i>. 2023;956(2). doi:<a href=\"https://doi.org/10.3847/2041-8213/acffc4\">10.3847/2041-8213/acffc4</a>","apa":"Miller, D. R., Caiazzo, I., Heyl, J., Richer, H. B., El-Badry, K., Rodriguez, A. C., … van Roestel, J. (2023). An extremely massive white dwarf escaped from the Hyades star cluster. <i>The Astrophysical Journal Letters</i>. American Astronomical Society. <a href=\"https://doi.org/10.3847/2041-8213/acffc4\">https://doi.org/10.3847/2041-8213/acffc4</a>"},"issue":"2","month":"10","language":[{"iso":"eng"}],"volume":956,"doi":"10.3847/2041-8213/acffc4"},{"oa_version":"Published Version","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1051/0004-6361/202347088"}],"arxiv":1,"article_number":"A57","article_type":"original","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publication_identifier":{"eissn":["1432-0746"],"issn":["0004-6361"]},"author":[{"full_name":"Doroshenko, Victor","first_name":"Victor","last_name":"Doroshenko"},{"last_name":"Poutanen","first_name":"Juri","full_name":"Poutanen, Juri"},{"last_name":"Heyl","full_name":"Heyl, Jeremy","first_name":"Jeremy"},{"full_name":"Tsygankov, Sergey S.","first_name":"Sergey S.","last_name":"Tsygankov"},{"orcid":"0000-0002-4770-5388","last_name":"Caiazzo","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","first_name":"Ilaria","full_name":"Caiazzo, 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Shuichi","last_name":"Gunji"},{"last_name":"Hayashida","full_name":"Hayashida, Kiyoshi","first_name":"Kiyoshi"},{"last_name":"Iwakiri","first_name":"Wataru","full_name":"Iwakiri, Wataru"},{"last_name":"Jorstad","full_name":"Jorstad, Svetlana G.","first_name":"Svetlana G."},{"last_name":"Kaaret","first_name":"Philip","full_name":"Kaaret, Philip"},{"last_name":"Karas","first_name":"Vladimir","full_name":"Karas, Vladimir"},{"last_name":"Kislat","first_name":"Fabian","full_name":"Kislat, Fabian"},{"first_name":"Takao","full_name":"Kitaguchi, Takao","last_name":"Kitaguchi"},{"last_name":"Kolodziejczak","full_name":"Kolodziejczak, Jeffery J.","first_name":"Jeffery J."},{"last_name":"Krawczynski","first_name":"Henric","full_name":"Krawczynski, Henric"},{"first_name":"Fabio","full_name":"La Monaca, Fabio","last_name":"La Monaca"},{"first_name":"Luca","full_name":"Latronico, Luca","last_name":"Latronico"},{"last_name":"Liodakis","first_name":"Ioannis","full_name":"Liodakis, Ioannis"},{"last_name":"Maldera","full_name":"Maldera, Simone","first_name":"Simone"},{"last_name":"Manfreda","full_name":"Manfreda, Alberto","first_name":"Alberto"},{"first_name":"Frédéric","full_name":"Marin, Frédéric","last_name":"Marin"},{"full_name":"Marinucci, Andrea","first_name":"Andrea","last_name":"Marinucci"},{"last_name":"Marscher","first_name":"Alan P.","full_name":"Marscher, Alan P."},{"full_name":"Marshall, Herman L.","first_name":"Herman L.","last_name":"Marshall"},{"last_name":"Massaro","full_name":"Massaro, Francesco","first_name":"Francesco"},{"full_name":"Matt, Giorgio","first_name":"Giorgio","last_name":"Matt"},{"last_name":"Mitsuishi","full_name":"Mitsuishi, Ikuyuki","first_name":"Ikuyuki"},{"first_name":"Tsunefumi","full_name":"Mizuno, Tsunefumi","last_name":"Mizuno"},{"last_name":"Muleri","full_name":"Muleri, Fabio","first_name":"Fabio"},{"first_name":"Michela","full_name":"Negro, Michela","last_name":"Negro"},{"last_name":"Ng","first_name":"Chi-Yung","full_name":"Ng, Chi-Yung"},{"first_name":"Stephen L.","full_name":"O’Dell, Stephen L.","last_name":"O’Dell"},{"last_name":"Omodei","first_name":"Nicola","full_name":"Omodei, Nicola"},{"last_name":"Oppedisano","first_name":"Chiara","full_name":"Oppedisano, Chiara"},{"first_name":"Alessandro","full_name":"Papitto, Alessandro","last_name":"Papitto"},{"last_name":"Pavlov","full_name":"Pavlov, George G.","first_name":"George G."},{"first_name":"Abel L.","full_name":"Peirson, Abel L.","last_name":"Peirson"},{"first_name":"Matteo","full_name":"Perri, Matteo","last_name":"Perri"},{"last_name":"Pesce-Rollins","full_name":"Pesce-Rollins, Melissa","first_name":"Melissa"},{"full_name":"Petrucci, Pierre-Olivier","first_name":"Pierre-Olivier","last_name":"Petrucci"},{"full_name":"Pilia, Maura","first_name":"Maura","last_name":"Pilia"},{"last_name":"Possenti","first_name":"Andrea","full_name":"Possenti, Andrea"},{"full_name":"Puccetti, Simonetta","first_name":"Simonetta","last_name":"Puccetti"},{"last_name":"Ramsey","full_name":"Ramsey, Brian D.","first_name":"Brian D."},{"first_name":"John","full_name":"Rankin, John","last_name":"Rankin"},{"last_name":"Ratheesh","full_name":"Ratheesh, Ajay","first_name":"Ajay"},{"full_name":"Roberts, Oliver J.","first_name":"Oliver J.","last_name":"Roberts"},{"last_name":"Romani","first_name":"Roger W.","full_name":"Romani, Roger W."},{"last_name":"Sgrò","first_name":"Carmelo","full_name":"Sgrò, Carmelo"},{"first_name":"Patrick","full_name":"Slane, Patrick","last_name":"Slane"},{"full_name":"Soffitta, Paolo","first_name":"Paolo","last_name":"Soffitta"},{"full_name":"Spandre, Gloria","first_name":"Gloria","last_name":"Spandre"},{"full_name":"Swartz, Douglas A.","first_name":"Douglas A.","last_name":"Swartz"},{"full_name":"Tamagawa, Toru","first_name":"Toru","last_name":"Tamagawa"},{"last_name":"Tavecchio","first_name":"Fabrizio","full_name":"Tavecchio, Fabrizio"},{"last_name":"Taverna","full_name":"Taverna, Roberto","first_name":"Roberto"},{"first_name":"Yuzuru","full_name":"Tawara, Yuzuru","last_name":"Tawara"},{"first_name":"Allyn F.","full_name":"Tennant, Allyn F.","last_name":"Tennant"},{"first_name":"Nicholas E.","full_name":"Thomas, Nicholas E.","last_name":"Thomas"},{"last_name":"Tombesi","first_name":"Francesco","full_name":"Tombesi, Francesco"},{"last_name":"Trois","full_name":"Trois, Alessio","first_name":"Alessio"},{"last_name":"Vink","full_name":"Vink, Jacco","first_name":"Jacco"},{"full_name":"Wu, Kinwah","first_name":"Kinwah","last_name":"Wu"},{"first_name":"Fei","full_name":"Xie, Fei","last_name":"Xie"},{"first_name":"Silvia","full_name":"Zane, Silvia","last_name":"Zane"}],"date_updated":"2024-04-02T06:57:11Z","publication":"Astronomy & Astrophysics","type":"journal_article","day":"04","date_published":"2023-09-04T00:00:00Z","intvolume":"       677","publication_status":"published","keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"abstract":[{"text":"We report on Imaging X-ray polarimetry explorer (IXPE) observations of the Be-transient X-ray pulsar LS V +44 17/RX J0440.9+4431 made at two luminosity levels during the giant outburst in January–February 2023. Considering the observed spectral variability and changes in the pulse profiles, the source was likely caught in supercritical and subcritical states with significantly different emission-region geometry, associated with the presence of accretion columns and hot spots, respectively. We focus here on the pulse-phase-resolved polarimetric analysis and find that the observed dependencies of the polarization degree and polarization angle (PA) on the pulse phase are indeed drastically different for the two observations. The observed differences, if interpreted within the framework of the rotating vector model (RVM), imply dramatic variations in the spin axis inclination, the position angle, and the magnetic colatitude by tens of degrees within the space of just a few days. We suggest that the apparent changes in the observed PA phase dependence are predominantly related to the presence of an unpulsed polarized component in addition to the polarized radiation associated with the pulsar itself. We then show that the observed PA phase dependence in both observations can be explained with a single set of RVM parameters defining the pulsar’s geometry. We also suggest that the additional polarized component is likely produced by scattering of the pulsar radiation in the equatorial disk wind.","lang":"eng"}],"title":"Complex variations in X-ray polarization in the X-ray pulsar LS V +44 17/RX J0440.9+4431","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)"},"publisher":"EDP Sciences","scopus_import":"1","year":"2023","extern":"1","external_id":{"arxiv":["2306.02116"]},"oa":1,"_id":"15193","article_processing_charge":"No","quality_controlled":"1","doi":"10.1051/0004-6361/202347088","language":[{"iso":"eng"}],"volume":677,"citation":{"chicago":"Doroshenko, Victor, Juri Poutanen, Jeremy Heyl, Sergey S. Tsygankov, Ilaria Caiazzo, Roberto Turolla, Alexandra Veledina, et al. “Complex Variations in X-Ray Polarization in the X-Ray Pulsar LS V +44 17/RX J0440.9+4431.” <i>Astronomy &#38; Astrophysics</i>. EDP Sciences, 2023. <a href=\"https://doi.org/10.1051/0004-6361/202347088\">https://doi.org/10.1051/0004-6361/202347088</a>.","ista":"Doroshenko V et al. 2023. Complex variations in X-ray polarization in the X-ray pulsar LS V +44 17/RX J0440.9+4431. Astronomy &#38; Astrophysics. 677, A57.","short":"V. Doroshenko, J. Poutanen, J. Heyl, S.S. Tsygankov, I. Caiazzo, R. Turolla, A. Veledina, M.C. Weisskopf, S.V. Forsblom, D. González-Caniulef, V. Loktev, C. Malacaria, A.A. Mushtukov, V.F. Suleimanov, A.A. Lutovinov, I.A. Mereminskiy, S.V. Molkov, A. Salganik, A. Santangelo, A.V. Berdyugin, V. Kravtsov, A.P. Nitindala, I. Agudo, L.A. Antonelli, M. Bachetti, L. Baldini, W.H. Baumgartner, R. Bellazzini, S. Bianchi, S.D. Bongiorno, R. Bonino, A. Brez, N. Bucciantini, F. Capitanio, S. Castellano, E. Cavazzuti, C.-T. Chen, S. Ciprini, E. Costa, A. De Rosa, E. Del Monte, L. Di Gesu, N. Di Lalla, A. Di Marco, I. Donnarumma, M. Dovčiak, S.R. Ehlert, T. Enoto, Y. Evangelista, S. Fabiani, R. Ferrazzoli, J.A. García, S. Gunji, K. Hayashida, W. Iwakiri, S.G. Jorstad, P. Kaaret, V. Karas, F. Kislat, T. Kitaguchi, J.J. Kolodziejczak, H. Krawczynski, F. La Monaca, L. Latronico, I. Liodakis, S. Maldera, A. Manfreda, F. Marin, A. Marinucci, A.P. Marscher, H.L. Marshall, F. Massaro, G. Matt, I. Mitsuishi, T. Mizuno, F. Muleri, M. Negro, C.-Y. Ng, S.L. O’Dell, N. Omodei, C. Oppedisano, A. Papitto, G.G. Pavlov, A.L. Peirson, M. Perri, M. Pesce-Rollins, P.-O. Petrucci, M. Pilia, A. Possenti, S. Puccetti, B.D. Ramsey, J. Rankin, A. Ratheesh, O.J. Roberts, R.W. Romani, C. Sgrò, P. Slane, P. Soffitta, G. Spandre, D.A. Swartz, T. Tamagawa, F. Tavecchio, R. Taverna, Y. Tawara, A.F. Tennant, N.E. Thomas, F. Tombesi, A. Trois, J. Vink, K. Wu, F. Xie, S. Zane, Astronomy &#38; Astrophysics 677 (2023).","apa":"Doroshenko, V., Poutanen, J., Heyl, J., Tsygankov, S. S., Caiazzo, I., Turolla, R., … Zane, S. (2023). Complex variations in X-ray polarization in the X-ray pulsar LS V +44 17/RX J0440.9+4431. <i>Astronomy &#38; Astrophysics</i>. EDP Sciences. <a href=\"https://doi.org/10.1051/0004-6361/202347088\">https://doi.org/10.1051/0004-6361/202347088</a>","mla":"Doroshenko, Victor, et al. “Complex Variations in X-Ray Polarization in the X-Ray Pulsar LS V +44 17/RX J0440.9+4431.” <i>Astronomy &#38; Astrophysics</i>, vol. 677, A57, EDP Sciences, 2023, doi:<a href=\"https://doi.org/10.1051/0004-6361/202347088\">10.1051/0004-6361/202347088</a>.","ieee":"V. Doroshenko <i>et al.</i>, “Complex variations in X-ray polarization in the X-ray pulsar LS V +44 17/RX J0440.9+4431,” <i>Astronomy &#38; Astrophysics</i>, vol. 677. EDP Sciences, 2023.","ama":"Doroshenko V, Poutanen J, Heyl J, et al. Complex variations in X-ray polarization in the X-ray pulsar LS V +44 17/RX J0440.9+4431. <i>Astronomy &#38; Astrophysics</i>. 2023;677. doi:<a href=\"https://doi.org/10.1051/0004-6361/202347088\">10.1051/0004-6361/202347088</a>"},"month":"09","date_created":"2024-03-26T09:46:01Z","status":"public"},{"_id":"15194","article_processing_charge":"No","quality_controlled":"1","oa":1,"issue":"1","citation":{"apa":"Rodriguez, A. C., Galiullin, I., Gilfanov, M., Kulkarni, S. R., Khamitov, I., Bikmaev, I., … Vanderbosch, Z. P. (2023). SRGeJ045359.9+622444: A 55 minute period eclipsing AM Canum Venaticorum star discovered from a joint SRG/eROSITA + ZTF search. <i>The Astrophysical Journal</i>. American Astronomical Society. <a href=\"https://doi.org/10.3847/1538-4357/ace698\">https://doi.org/10.3847/1538-4357/ace698</a>","ieee":"A. C. Rodriguez <i>et al.</i>, “SRGeJ045359.9+622444: A 55 minute period eclipsing AM Canum Venaticorum star discovered from a joint SRG/eROSITA + ZTF search,” <i>The Astrophysical Journal</i>, vol. 954, no. 1. American Astronomical Society, 2023.","mla":"Rodriguez, Antonio C., et al. “SRGeJ045359.9+622444: A 55 Minute Period Eclipsing AM Canum Venaticorum Star Discovered from a Joint SRG/EROSITA + ZTF Search.” <i>The Astrophysical Journal</i>, vol. 954, no. 1, 63, American Astronomical Society, 2023, doi:<a href=\"https://doi.org/10.3847/1538-4357/ace698\">10.3847/1538-4357/ace698</a>.","ama":"Rodriguez AC, Galiullin I, Gilfanov M, et al. SRGeJ045359.9+622444: A 55 minute period eclipsing AM Canum Venaticorum star discovered from a joint SRG/eROSITA + ZTF search. <i>The Astrophysical Journal</i>. 2023;954(1). doi:<a href=\"https://doi.org/10.3847/1538-4357/ace698\">10.3847/1538-4357/ace698</a>","chicago":"Rodriguez, Antonio C., Ilkham Galiullin, Marat Gilfanov, Shrinivas R. Kulkarni, Irek Khamitov, Ilfan Bikmaev, Jan van Roestel, et al. “SRGeJ045359.9+622444: A 55 Minute Period Eclipsing AM Canum Venaticorum Star Discovered from a Joint SRG/EROSITA + ZTF Search.” <i>The Astrophysical Journal</i>. American Astronomical Society, 2023. <a href=\"https://doi.org/10.3847/1538-4357/ace698\">https://doi.org/10.3847/1538-4357/ace698</a>.","ista":"Rodriguez AC, Galiullin I, Gilfanov M, Kulkarni SR, Khamitov I, Bikmaev I, van Roestel J, Yungelson L, El-Badry K, Sunayev R, Prince TA, Buntov M, Caiazzo I, Drake A, Gorbachev M, Graham MJ, Gumerov R, Irtuganov E, Laher RR, Masci FJ, Medvedev P, Purdum J, Sakhibullin N, Sklyanov A, Smith R, Szkody P, Vanderbosch ZP. 2023. SRGeJ045359.9+622444: A 55 minute period eclipsing AM Canum Venaticorum star discovered from a joint SRG/eROSITA + ZTF search. The Astrophysical Journal. 954(1), 63.","short":"A.C. Rodriguez, I. Galiullin, M. Gilfanov, S.R. Kulkarni, I. Khamitov, I. Bikmaev, J. van Roestel, L. Yungelson, K. El-Badry, R. Sunayev, T.A. Prince, M. Buntov, I. Caiazzo, A. Drake, M. Gorbachev, M.J. Graham, R. Gumerov, E. Irtuganov, R.R. Laher, F.J. Masci, P. Medvedev, J. Purdum, N. Sakhibullin, A. Sklyanov, R. Smith, P. Szkody, Z.P. Vanderbosch, The Astrophysical Journal 954 (2023)."},"month":"08","date_created":"2024-03-26T09:46:30Z","status":"public","doi":"10.3847/1538-4357/ace698","language":[{"iso":"eng"}],"volume":954,"title":"SRGeJ045359.9+622444: A 55 minute period eclipsing AM Canum Venaticorum star discovered from a joint SRG/eROSITA + ZTF search","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)"},"publisher":"American Astronomical Society","keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"abstract":[{"text":"AM Canum Venaticorum (AM CVn) systems are ultracompact binaries where a white dwarf accretes from a helium-rich degenerate or semidegenerate donor. Some AM CVn systems will be among the loudest sources of gravitational waves for the upcoming Laser Interferometer Space Antenna; yet the formation channel of AM CVns remains uncertain. We report the study and characterization of a new eclipsing AM CVn, SRGeJ045359.9+622444 (hereafter, SRGeJ0453), discovered from a joint Spektrum-Roentgen-Gamma (SRG) Extended Roentgen Survey with an Imaging Telescope Array (eROSITA) mission and Zwicky Transient Facility program to identify cataclysmic variables (CVs). We obtained optical photometry to confirm the eclipse of SRGeJ0453 and determine the orbital period to be \r\n. We constrain the binary parameters by modeling the high-speed photometry and radial-velocity curves and find Mdonor = 0.044 ± 0.024M⊙ and Rdonor = 0.078 ± 0.012R⊙. The X-ray spectrum is approximated by a power-law model with an unusually flat photon index of Γ ∼ 1 previously seen in magnetic CVs with SRG/eROSITA, but verifying that the magnetic nature of SRGeJ0453 requires further investigation. Optical spectroscopy suggests that the donor star of SRGeJ0453 could have initially been a He star or a He white dwarf. SRGeJ0453 is the ninth eclipsing AM CVn system published to date, and its lack of optical outbursts have made it elusive in previous surveys. The discovery of SRGeJ0453 using joint X-ray and optical surveys highlights the potential for discovering similar systems in the near future.","lang":"eng"}],"scopus_import":"1","year":"2023","extern":"1","date_published":"2023-08-23T00:00:00Z","type":"journal_article","day":"23","intvolume":"       954","publication_status":"published","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publication_identifier":{"issn":["0004-637X"],"eissn":["1538-4357"]},"author":[{"last_name":"Rodriguez","first_name":"Antonio C.","full_name":"Rodriguez, Antonio C."},{"last_name":"Galiullin","first_name":"Ilkham","full_name":"Galiullin, Ilkham"},{"last_name":"Gilfanov","first_name":"Marat","full_name":"Gilfanov, Marat"},{"full_name":"Kulkarni, Shrinivas R.","first_name":"Shrinivas R.","last_name":"Kulkarni"},{"full_name":"Khamitov, Irek","first_name":"Irek","last_name":"Khamitov"},{"last_name":"Bikmaev","first_name":"Ilfan","full_name":"Bikmaev, Ilfan"},{"first_name":"Jan","full_name":"van Roestel, Jan","last_name":"van Roestel"},{"first_name":"Lev","full_name":"Yungelson, Lev","last_name":"Yungelson"},{"last_name":"El-Badry","first_name":"Kareem","full_name":"El-Badry, Kareem"},{"last_name":"Sunayev","first_name":"Rashid","full_name":"Sunayev, Rashid"},{"last_name":"Prince","full_name":"Prince, Thomas A.","first_name":"Thomas A."},{"first_name":"Mikhail","full_name":"Buntov, Mikhail","last_name":"Buntov"},{"full_name":"Caiazzo, Ilaria","first_name":"Ilaria","last_name":"Caiazzo","orcid":"0000-0002-4770-5388","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d"},{"first_name":"Andrew","full_name":"Drake, Andrew","last_name":"Drake"},{"last_name":"Gorbachev","full_name":"Gorbachev, Mark","first_name":"Mark"},{"last_name":"Graham","first_name":"Matthew J.","full_name":"Graham, Matthew J."},{"first_name":"Rustam","full_name":"Gumerov, Rustam","last_name":"Gumerov"},{"full_name":"Irtuganov, Eldar","first_name":"Eldar","last_name":"Irtuganov"},{"first_name":"Russ R.","full_name":"Laher, Russ R.","last_name":"Laher"},{"first_name":"Frank J.","full_name":"Masci, Frank J.","last_name":"Masci"},{"last_name":"Medvedev","first_name":"Pavel","full_name":"Medvedev, Pavel"},{"last_name":"Purdum","first_name":"Josiah","full_name":"Purdum, Josiah"},{"last_name":"Sakhibullin","full_name":"Sakhibullin, Nail","first_name":"Nail"},{"last_name":"Sklyanov","full_name":"Sklyanov, Alexander","first_name":"Alexander"},{"full_name":"Smith, Roger","first_name":"Roger","last_name":"Smith"},{"full_name":"Szkody, Paula","first_name":"Paula","last_name":"Szkody"},{"full_name":"Vanderbosch, Zachary P.","first_name":"Zachary P.","last_name":"Vanderbosch"}],"main_file_link":[{"open_access":"1","url":"https://doi.org/10.3847/1538-4357/ace698"}],"oa_version":"Published Version","article_number":"63","article_type":"original","publication":"The Astrophysical Journal","date_updated":"2024-04-02T06:58:03Z"},{"extern":"1","scopus_import":"1","year":"2023","keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"abstract":[{"text":"We report the discovery of ZTF J0127+5258, a compact mass-transferring binary with an orbital period of 13.7 minutes. The system contains a white dwarf accretor, which likely originated as a post–common envelope carbon–oxygen (CO) white dwarf, and a warm donor (Teff,donor = 16,400 ± 1000 K). The donor probably formed during a common envelope phase between the CO white dwarf and an evolving giant that left behind a helium star or white dwarf in a close orbit with the CO white dwarf. We measure gravitational wave–driven orbital inspiral with ∼51σ significance, which yields a joint constraint on the component masses and mass transfer rate. While the accretion disk in the system is dominated by ionized helium emission, the donor exhibits a mixture of hydrogen and helium absorption lines. Phase-resolved spectroscopy yields a donor radial velocity semiamplitude of 771 ± 27 km s−1, and high-speed photometry reveals that the system is eclipsing. We detect a Chandra X-ray counterpart with LX ∼ 3 × 1031 erg s−1. Depending on the mass transfer rate, the system will likely either evolve into a stably mass-transferring helium cataclysmic variable, merge to become an R CrB star, or explode as a Type Ia supernova in the next million years. We predict that the Laser Space Interferometer Antenna (LISA) will detect the source with a signal-to-noise ratio of 24 ± 6 after 4 yr of observations. The system is the first LISA-loud mass-transferring binary with an intrinsically luminous donor, a class of sources that provide the opportunity to leverage the synergy between optical and infrared time domain surveys, X-ray facilities, and gravitational-wave observatories to probe general relativity, accretion physics, and binary evolution.","lang":"eng"}],"publisher":"American Astronomical Society","title":"Orbital decay in an accreting and eclipsing 13.7 minute orbital period binary with a luminous donor","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)"},"language":[{"iso":"eng"}],"volume":953,"doi":"10.3847/2041-8213/ace7cf","date_created":"2024-03-26T09:47:22Z","status":"public","citation":{"short":"K.B. Burdge, K. El-Badry, S. Rappaport, T.L. Sunny Wong, E.B. Bauer, L. Bildsten, I. Caiazzo, D. Chakrabarty, E. Chickles, M.J. Graham, E. Kara, S.R. Kulkarni, T.R. Marsh, M. Nynka, T.A. Prince, R.A. Simcoe, J. van Roestel, Z. Vanderbosch, E.C. Bellm, R.G. Dekany, A.J. Drake, G. Helou, F.J. Masci, J. Milburn, R. Riddle, B. Rusholme, R. Smith, The Astrophysical Journal Letters 953 (2023).","chicago":"Burdge, Kevin B., Kareem El-Badry, Saul Rappaport, Tin Long Sunny Wong, Evan B. Bauer, Lars Bildsten, Ilaria Caiazzo, et al. “Orbital Decay in an Accreting and Eclipsing 13.7 Minute Orbital Period Binary with a Luminous Donor.” <i>The Astrophysical Journal Letters</i>. American Astronomical Society, 2023. <a href=\"https://doi.org/10.3847/2041-8213/ace7cf\">https://doi.org/10.3847/2041-8213/ace7cf</a>.","ista":"Burdge KB, El-Badry K, Rappaport S, Sunny Wong TL, Bauer EB, Bildsten L, Caiazzo I, Chakrabarty D, Chickles E, Graham MJ, Kara E, Kulkarni SR, Marsh TR, Nynka M, Prince TA, Simcoe RA, van Roestel J, Vanderbosch Z, Bellm EC, Dekany RG, Drake AJ, Helou G, Masci FJ, Milburn J, Riddle R, Rusholme B, Smith R. 2023. Orbital decay in an accreting and eclipsing 13.7 minute orbital period binary with a luminous donor. The Astrophysical Journal Letters. 953(1), L1.","ama":"Burdge KB, El-Badry K, Rappaport S, et al. Orbital decay in an accreting and eclipsing 13.7 minute orbital period binary with a luminous donor. <i>The Astrophysical Journal Letters</i>. 2023;953(1). doi:<a href=\"https://doi.org/10.3847/2041-8213/ace7cf\">10.3847/2041-8213/ace7cf</a>","mla":"Burdge, Kevin B., et al. “Orbital Decay in an Accreting and Eclipsing 13.7 Minute Orbital Period Binary with a Luminous Donor.” <i>The Astrophysical Journal Letters</i>, vol. 953, no. 1, L1, American Astronomical Society, 2023, doi:<a href=\"https://doi.org/10.3847/2041-8213/ace7cf\">10.3847/2041-8213/ace7cf</a>.","ieee":"K. B. Burdge <i>et al.</i>, “Orbital decay in an accreting and eclipsing 13.7 minute orbital period binary with a luminous donor,” <i>The Astrophysical Journal Letters</i>, vol. 953, no. 1. American Astronomical Society, 2023.","apa":"Burdge, K. B., El-Badry, K., Rappaport, S., Sunny Wong, T. L., Bauer, E. B., Bildsten, L., … Smith, R. (2023). Orbital decay in an accreting and eclipsing 13.7 minute orbital period binary with a luminous donor. <i>The Astrophysical Journal Letters</i>. American Astronomical Society. <a href=\"https://doi.org/10.3847/2041-8213/ace7cf\">https://doi.org/10.3847/2041-8213/ace7cf</a>"},"issue":"1","month":"08","oa":1,"external_id":{"arxiv":["2303.13573"]},"quality_controlled":"1","_id":"15196","article_processing_charge":"No","date_updated":"2024-04-02T07:01:46Z","publication":"The Astrophysical Journal Letters","article_number":"L1","article_type":"original","arxiv":1,"main_file_link":[{"url":"https://doi.org/10.3847/2041-8213/ace7cf","open_access":"1"}],"oa_version":"Published Version","author":[{"last_name":"Burdge","first_name":"Kevin B.","full_name":"Burdge, Kevin B."},{"full_name":"El-Badry, Kareem","first_name":"Kareem","last_name":"El-Badry"},{"last_name":"Rappaport","full_name":"Rappaport, Saul","first_name":"Saul"},{"first_name":"Tin Long","full_name":"Sunny Wong, Tin Long","last_name":"Sunny Wong"},{"last_name":"Bauer","full_name":"Bauer, Evan B.","first_name":"Evan B."},{"last_name":"Bildsten","full_name":"Bildsten, Lars","first_name":"Lars"},{"full_name":"Caiazzo, Ilaria","first_name":"Ilaria","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","last_name":"Caiazzo","orcid":"0000-0002-4770-5388"},{"last_name":"Chakrabarty","full_name":"Chakrabarty, Deepto","first_name":"Deepto"},{"full_name":"Chickles, Emma","first_name":"Emma","last_name":"Chickles"},{"first_name":"Matthew J.","full_name":"Graham, Matthew J.","last_name":"Graham"},{"last_name":"Kara","first_name":"Erin","full_name":"Kara, Erin"},{"full_name":"Kulkarni, S. R.","first_name":"S. R.","last_name":"Kulkarni"},{"last_name":"Marsh","full_name":"Marsh, Thomas R.","first_name":"Thomas R."},{"first_name":"Melania","full_name":"Nynka, Melania","last_name":"Nynka"},{"full_name":"Prince, Thomas A.","first_name":"Thomas A.","last_name":"Prince"},{"full_name":"Simcoe, Robert A.","first_name":"Robert A.","last_name":"Simcoe"},{"last_name":"van Roestel","first_name":"Jan","full_name":"van Roestel, Jan"},{"full_name":"Vanderbosch, Zach","first_name":"Zach","last_name":"Vanderbosch"},{"full_name":"Bellm, Eric C.","first_name":"Eric C.","last_name":"Bellm"},{"first_name":"Richard G.","full_name":"Dekany, Richard G.","last_name":"Dekany"},{"last_name":"Drake","full_name":"Drake, Andrew J.","first_name":"Andrew J."},{"first_name":"George","full_name":"Helou, George","last_name":"Helou"},{"last_name":"Masci","full_name":"Masci, Frank J.","first_name":"Frank J."},{"full_name":"Milburn, Jennifer","first_name":"Jennifer","last_name":"Milburn"},{"last_name":"Riddle","first_name":"Reed","full_name":"Riddle, Reed"},{"last_name":"Rusholme","first_name":"Ben","full_name":"Rusholme, Ben"},{"last_name":"Smith","first_name":"Roger","full_name":"Smith, Roger"}],"publication_identifier":{"issn":["2041-8205"],"eissn":["2041-8213"]},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publication_status":"published","intvolume":"       953","day":"08","type":"journal_article","date_published":"2023-08-08T00:00:00Z"},{"intvolume":"       400","publication_status":"published","type":"journal_article","day":"07","date_published":"2023-04-07T00:00:00Z","date_updated":"2024-04-02T07:02:28Z","publication":"Icarus","main_file_link":[{"url":"https://arxiv.org/abs/2303.08130","open_access":"1"}],"oa_version":"Preprint","arxiv":1,"article_number":"115562","article_type":"original","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"first_name":"B.T.","full_name":"Bolin, B.T.","last_name":"Bolin"},{"first_name":"K.S.","full_name":"Noll, K.S.","last_name":"Noll"},{"first_name":"Ilaria","full_name":"Caiazzo, Ilaria","last_name":"Caiazzo","orcid":"0000-0002-4770-5388","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d"},{"last_name":"Fremling","full_name":"Fremling, C.","first_name":"C."},{"last_name":"Binzel","first_name":"R.P.","full_name":"Binzel, R.P."}],"publication_identifier":{"issn":["0019-1035"]},"doi":"10.1016/j.icarus.2023.115562","language":[{"iso":"eng"}],"volume":400,"citation":{"short":"B.T. Bolin, K.S. Noll, I. Caiazzo, C. Fremling, R.P. Binzel, Icarus 400 (2023).","chicago":"Bolin, B.T., K.S. Noll, Ilaria Caiazzo, C. Fremling, and R.P. Binzel. “Keck and Gemini Spectral Characterization of Lucy Mission Fly-by Target (152830) Dinkinesh.” <i>Icarus</i>. Elsevier, 2023. <a href=\"https://doi.org/10.1016/j.icarus.2023.115562\">https://doi.org/10.1016/j.icarus.2023.115562</a>.","ista":"Bolin BT, Noll KS, Caiazzo I, Fremling C, Binzel RP. 2023. Keck and Gemini spectral characterization of Lucy mission fly-by target (152830) Dinkinesh. Icarus. 400, 115562.","mla":"Bolin, B. T., et al. “Keck and Gemini Spectral Characterization of Lucy Mission Fly-by Target (152830) Dinkinesh.” <i>Icarus</i>, vol. 400, 115562, Elsevier, 2023, doi:<a href=\"https://doi.org/10.1016/j.icarus.2023.115562\">10.1016/j.icarus.2023.115562</a>.","ieee":"B. T. Bolin, K. S. Noll, I. Caiazzo, C. Fremling, and R. P. Binzel, “Keck and Gemini spectral characterization of Lucy mission fly-by target (152830) Dinkinesh,” <i>Icarus</i>, vol. 400. Elsevier, 2023.","ama":"Bolin BT, Noll KS, Caiazzo I, Fremling C, Binzel RP. Keck and Gemini spectral characterization of Lucy mission fly-by target (152830) Dinkinesh. <i>Icarus</i>. 2023;400. doi:<a href=\"https://doi.org/10.1016/j.icarus.2023.115562\">10.1016/j.icarus.2023.115562</a>","apa":"Bolin, B. T., Noll, K. S., Caiazzo, I., Fremling, C., &#38; Binzel, R. P. (2023). Keck and Gemini spectral characterization of Lucy mission fly-by target (152830) Dinkinesh. <i>Icarus</i>. Elsevier. <a href=\"https://doi.org/10.1016/j.icarus.2023.115562\">https://doi.org/10.1016/j.icarus.2023.115562</a>"},"month":"04","date_created":"2024-03-26T09:47:44Z","status":"public","external_id":{"arxiv":["2303.08130"]},"oa":1,"article_processing_charge":"No","_id":"15197","quality_controlled":"1","scopus_import":"1","year":"2023","extern":"1","keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"abstract":[{"lang":"eng","text":"Recently, the inner main belt asteroid (152830) Dinkinesh was identified as an additional fly- by target for the Lucy mission. The heliocentric orbit and approximate absolute magnitude of Dinkinesh are known, but little additional information was available prior to its selection as a target. In particular, the lack of color spectrophotometry or spectra made it impossible to assign a spectral type to Dinkinesh from which its albedo could be estimated. We set out to remedy this knowledge gap by obtaining visible wavelength spectra with the Keck telescope on 2022 November 23 and with Gemini-South on 2022 December 27. The spectra measured with the Keck I/Low Resolution Imaging Spectrometer (LRIS) and the Gemini South/Gemini Multi-Object Spectrograph South (GMOS-S) are most similar to the average spectrum of S- and Sq-type asteroids. The most diagnostic feature is the ≈15 ± 1% silicate absorption feature at ≈0.9–1.0 μm. Small S- and Sq-type asteroids have moderately high albedos ranging from 0.17 to 0.35. Using this albedo range for Dinkinesh in combination with measured absolute magnitude, it is possible to derive an effective diameter and surface brightness for this body. The albedo, size and surface brightness are important inputs required for planning a successful encounter by the Lucy spacecraft."}],"title":"Keck and Gemini spectral characterization of Lucy mission fly-by target (152830) Dinkinesh","publisher":"Elsevier"},{"publication_status":"published","intvolume":"       520","day":"12","type":"journal_article","page":"364-374","date_published":"2023-01-12T00:00:00Z","date_updated":"2024-04-02T07:13:10Z","publication":"Monthly Notices of the Royal Astronomical Society","article_type":"original","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2205.01015"}],"arxiv":1,"oa_version":"Preprint","author":[{"last_name":"Fleury","full_name":"Fleury, Leesa","first_name":"Leesa"},{"last_name":"Caiazzo","orcid":"0000-0002-4770-5388","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","full_name":"Caiazzo, Ilaria","first_name":"Ilaria"},{"last_name":"Heyl","first_name":"Jeremy","full_name":"Heyl, Jeremy"}],"publication_identifier":{"eissn":["1365-2966"],"issn":["0035-8711"]},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","language":[{"iso":"eng"}],"volume":520,"doi":"10.1093/mnras/stad068","date_created":"2024-03-26T09:48:27Z","status":"public","issue":"1","citation":{"apa":"Fleury, L., Caiazzo, I., &#38; Heyl, J. (2023). The origin of ultramassive white dwarfs: hints from <i>Gaia</i> EDR3. <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press. <a href=\"https://doi.org/10.1093/mnras/stad068\">https://doi.org/10.1093/mnras/stad068</a>","ieee":"L. Fleury, I. Caiazzo, and J. Heyl, “The origin of ultramassive white dwarfs: hints from <i>Gaia</i> EDR3,” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 520, no. 1. Oxford University Press, pp. 364–374, 2023.","mla":"Fleury, Leesa, et al. “The Origin of Ultramassive White Dwarfs: Hints from <i>Gaia</i> EDR3.” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 520, no. 1, Oxford University Press, 2023, pp. 364–74, doi:<a href=\"https://doi.org/10.1093/mnras/stad068\">10.1093/mnras/stad068</a>.","ama":"Fleury L, Caiazzo I, Heyl J. The origin of ultramassive white dwarfs: hints from <i>Gaia</i> EDR3. <i>Monthly Notices of the Royal Astronomical Society</i>. 2023;520(1):364-374. doi:<a href=\"https://doi.org/10.1093/mnras/stad068\">10.1093/mnras/stad068</a>","ista":"Fleury L, Caiazzo I, Heyl J. 2023. The origin of ultramassive white dwarfs: hints from <i>Gaia</i> EDR3. Monthly Notices of the Royal Astronomical Society. 520(1), 364–374.","chicago":"Fleury, Leesa, Ilaria Caiazzo, and Jeremy Heyl. “The Origin of Ultramassive White Dwarfs: Hints from <i>Gaia</i> EDR3.” <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press, 2023. <a href=\"https://doi.org/10.1093/mnras/stad068\">https://doi.org/10.1093/mnras/stad068</a>.","short":"L. Fleury, I. Caiazzo, J. Heyl, Monthly Notices of the Royal Astronomical Society 520 (2023) 364–374."},"month":"01","oa":1,"external_id":{"arxiv":["2205.01015"]},"_id":"15199","quality_controlled":"1","article_processing_charge":"No","extern":"1","scopus_import":"1","year":"2023","keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"abstract":[{"lang":"eng","text":"Gaia Data Release 2 revealed a population of ultramassive white dwarfs on the Q branch that are moving anomalously fast for a local disc population with their young photometric ages. As the velocity dispersion of stars in the local disc increases with age, a proposed explanation of these white dwarfs is that they experience a cooling delay that causes current cooling models to infer photometric ages much younger than their true ages. To explore this explanation, we investigate the kinematics of ultramassive white dwarfs within 200 pc of the Sun using the improved Gaia Early Data Release 3 observations. We analyse the transverse motions of 0.95–1.25 M⊙ white dwarfs, subdivided by mass and age, and determine the distributions of the three-dimensional components of the transverse velocities. The results are compared to expectations based on observed kinematics of local main-sequence stars. We find a population of photometrically young (∼0.5–1.5 Gyr) ultramassive (∼1.15–1.25 M⊙) white dwarfs for which the transverse velocity component in the direction of Galactic rotation is more dispersed than for local disc stars of any age; thus, it is too dispersed to be explained by any cooling delay in white dwarfs originating from the local disc. Furthermore, the dispersion ratio of the velocity components in the Galactic plane for this population is also inconsistent with a local disc origin. We discuss some possible explanations of this kinematically anomalous population, such as a halo origin or production through dynamical effects of stellar triple systems."}],"publisher":"Oxford University Press","title":"The origin of ultramassive white dwarfs: hints from <i>Gaia</i> EDR3"},{"title":"Discovery of two polars from a crossmatch of ZTF and the SRG/eFEDS x-ray catalog","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)"},"publisher":"American Astronomical Society","abstract":[{"lang":"eng","text":"Magnetic cataclysmic variables (CVs) are luminous Galactic X-ray sources, which have been difficult to find in purely optical surveys due to their lack of outburst behavior. The eROSITA telescope on board the Spektr-RG mission is conducting an all-sky X-ray survey and recently released the public eROSITA Final Equatorial Depth Survey (eFEDS) catalog. We crossmatched the eFEDS catalog with photometry from the Zwicky Transient Facility and discovered two new magnetic CVs. We obtained high-cadence optical photometry and phase-resolved spectroscopy for each magnetic CV candidate and found them both to be polars. Among the newly discovered magnetic CVs is eFEDS J085037.2+044359/ZTFJ0850+0443, an eclipsing polar with orbital period Porb = 1.72 hr and WD mass MWD = 0.81 ± 0.08M⊙. We suggest that eFEDS J085037.2+044359/ZTFJ0850+0443 is a low magnetic field strength polar, with BWD ≲ 10 MG. We also discovered a non-eclipsing polar, eFEDS J092614.1+010558/ZTFJ0926+0105, with orbital period Porb = 1.47 hr and magnetic field strength BWD = 36–42 MG."}],"keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"year":"2023","scopus_import":"1","extern":"1","quality_controlled":"1","_id":"15200","article_processing_charge":"No","external_id":{"arxiv":["2206.04714"]},"oa":1,"month":"03","issue":"2","citation":{"short":"A.C. Rodriguez, S.R. Kulkarni, T.A. Prince, P. Szkody, K.B. Burdge, I. Caiazzo, J. van Roestel, Z.P. Vanderbosch, K. El-Badry, E.C. Bellm, B.T. Gänsicke, M.J. Graham, A.A. Mahabal, F.J. Masci, P. Mróz, R. Riddle, B. Rusholme, The Astrophysical Journal 945 (2023).","ista":"Rodriguez AC, Kulkarni SR, Prince TA, Szkody P, Burdge KB, Caiazzo I, van Roestel J, Vanderbosch ZP, El-Badry K, Bellm EC, Gänsicke BT, Graham MJ, Mahabal AA, Masci FJ, Mróz P, Riddle R, Rusholme B. 2023. Discovery of two polars from a crossmatch of ZTF and the SRG/eFEDS x-ray catalog. The Astrophysical Journal. 945(2), 141.","chicago":"Rodriguez, Antonio C., Shrinivas R. Kulkarni, Thomas A. Prince, Paula Szkody, Kevin B. Burdge, Ilaria Caiazzo, Jan van Roestel, et al. “Discovery of Two Polars from a Crossmatch of ZTF and the SRG/EFEDS x-Ray Catalog.” <i>The Astrophysical Journal</i>. American Astronomical Society, 2023. <a href=\"https://doi.org/10.3847/1538-4357/acbb6f\">https://doi.org/10.3847/1538-4357/acbb6f</a>.","ama":"Rodriguez AC, Kulkarni SR, Prince TA, et al. Discovery of two polars from a crossmatch of ZTF and the SRG/eFEDS x-ray catalog. <i>The Astrophysical Journal</i>. 2023;945(2). doi:<a href=\"https://doi.org/10.3847/1538-4357/acbb6f\">10.3847/1538-4357/acbb6f</a>","mla":"Rodriguez, Antonio C., et al. “Discovery of Two Polars from a Crossmatch of ZTF and the SRG/EFEDS x-Ray Catalog.” <i>The Astrophysical Journal</i>, vol. 945, no. 2, 141, American Astronomical Society, 2023, doi:<a href=\"https://doi.org/10.3847/1538-4357/acbb6f\">10.3847/1538-4357/acbb6f</a>.","ieee":"A. C. Rodriguez <i>et al.</i>, “Discovery of two polars from a crossmatch of ZTF and the SRG/eFEDS x-ray catalog,” <i>The Astrophysical Journal</i>, vol. 945, no. 2. American Astronomical Society, 2023.","apa":"Rodriguez, A. C., Kulkarni, S. R., Prince, T. A., Szkody, P., Burdge, K. B., Caiazzo, I., … Rusholme, B. (2023). Discovery of two polars from a crossmatch of ZTF and the SRG/eFEDS x-ray catalog. <i>The Astrophysical Journal</i>. American Astronomical Society. <a href=\"https://doi.org/10.3847/1538-4357/acbb6f\">https://doi.org/10.3847/1538-4357/acbb6f</a>"},"status":"public","date_created":"2024-03-26T09:48:51Z","doi":"10.3847/1538-4357/acbb6f","volume":945,"language":[{"iso":"eng"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publication_identifier":{"issn":["0004-637X"],"eissn":["1538-4357"]},"author":[{"last_name":"Rodriguez","first_name":"Antonio C.","full_name":"Rodriguez, Antonio C."},{"last_name":"Kulkarni","first_name":"Shrinivas R.","full_name":"Kulkarni, Shrinivas R."},{"last_name":"Prince","full_name":"Prince, Thomas A.","first_name":"Thomas A."},{"first_name":"Paula","full_name":"Szkody, Paula","last_name":"Szkody"},{"full_name":"Burdge, Kevin B.","first_name":"Kevin B.","last_name":"Burdge"},{"full_name":"Caiazzo, Ilaria","first_name":"Ilaria","orcid":"0000-0002-4770-5388","last_name":"Caiazzo","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d"},{"last_name":"van Roestel","first_name":"Jan","full_name":"van Roestel, Jan"},{"first_name":"Zachary P.","full_name":"Vanderbosch, Zachary P.","last_name":"Vanderbosch"},{"last_name":"El-Badry","first_name":"Kareem","full_name":"El-Badry, Kareem"},{"first_name":"Eric C.","full_name":"Bellm, Eric C.","last_name":"Bellm"},{"full_name":"Gänsicke, Boris T.","first_name":"Boris T.","last_name":"Gänsicke"},{"first_name":"Matthew J.","full_name":"Graham, Matthew J.","last_name":"Graham"},{"last_name":"Mahabal","first_name":"Ashish A.","full_name":"Mahabal, Ashish A."},{"last_name":"Masci","first_name":"Frank J.","full_name":"Masci, Frank J."},{"full_name":"Mróz, Przemek","first_name":"Przemek","last_name":"Mróz"},{"first_name":"Reed","full_name":"Riddle, Reed","last_name":"Riddle"},{"last_name":"Rusholme","first_name":"Ben","full_name":"Rusholme, Ben"}],"main_file_link":[{"open_access":"1","url":"https://doi.org/10.3847/1538-4357/acbb6f"}],"oa_version":"Published Version","arxiv":1,"article_number":"141","article_type":"original","publication":"The Astrophysical Journal","date_updated":"2024-04-02T07:13:55Z","date_published":"2023-03-15T00:00:00Z","type":"journal_article","day":"15","intvolume":"       945","publication_status":"published"},{"oa_version":"Preprint","arxiv":1,"main_file_link":[{"url":"https://arxiv.org/abs/2204.00140","open_access":"1"}],"article_type":"original","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publication_identifier":{"eissn":["1365-2966"],"issn":["0035-8711"]},"author":[{"full_name":"González-Caniulef, Denis","first_name":"Denis","last_name":"González-Caniulef"},{"id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","orcid":"0000-0002-4770-5388","last_name":"Caiazzo","full_name":"Caiazzo, Ilaria","first_name":"Ilaria"},{"full_name":"Heyl, Jeremy","first_name":"Jeremy","last_name":"Heyl"}],"date_updated":"2024-04-02T07:14:49Z","publication":"Monthly Notices of the Royal Astronomical Society","page":"5902-5912","type":"journal_article","day":"16","date_published":"2023-01-16T00:00:00Z","intvolume":"       519","publication_status":"published","abstract":[{"lang":"eng","text":"We present a systematic study of the unbinned, photon-by-photon likelihood technique which can be used as an alternative method to analyse phase-dependent, X-ray spectro-polarimetric observations obtained with IXPE and other photoelectric polarimeters. We apply the unbinned technique to models of the luminous X-ray pulsar Hercules X-1, for which we produce simulated observations using the IXPEOBSSIM package. We consider minimal knowledge about the actual physical process responsible for the polarized emission from the accreting pulsar and assume that the observed phase-dependent polarization angle can be described by the rotating vector model. Using the unbinned technique, the detector’s modulation factor, and the polarization information alone, we found that both the rotating vector model and the underlying spectro-polarimetry model can reconstruct equally well the geometric configuration angles of the accreting pulsar. However, the measured polarization fraction becomes biased with respect to the underlying model unless the energy dispersion and effective area of the detector are also taken into account. To this end, we present an energy-dispersed likelihood estimator that is proved to be unbiased. For different analyses, we obtain posterior distributions from multiple IXPEOBSSIM realizations and show that the unbinned technique yields \r\n smaller error bars than the binned technique. We also discuss alternative sources, such as magnetars, in which the unbinned technique and the rotating vector model might be applied."}],"keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"title":"Unbinned likelihood analysis for X-ray polarization","publisher":"Oxford University Press","year":"2023","scopus_import":"1","extern":"1","external_id":{"arxiv":["2204.00140"]},"oa":1,"_id":"15201","article_processing_charge":"No","quality_controlled":"1","doi":"10.1093/mnras/stad033","volume":519,"language":[{"iso":"eng"}],"month":"01","issue":"4","citation":{"apa":"González-Caniulef, D., Caiazzo, I., &#38; Heyl, J. (2023). Unbinned likelihood analysis for X-ray polarization. <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press. <a href=\"https://doi.org/10.1093/mnras/stad033\">https://doi.org/10.1093/mnras/stad033</a>","ama":"González-Caniulef D, Caiazzo I, Heyl J. Unbinned likelihood analysis for X-ray polarization. <i>Monthly Notices of the Royal Astronomical Society</i>. 2023;519(4):5902-5912. doi:<a href=\"https://doi.org/10.1093/mnras/stad033\">10.1093/mnras/stad033</a>","mla":"González-Caniulef, Denis, et al. “Unbinned Likelihood Analysis for X-Ray Polarization.” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 519, no. 4, Oxford University Press, 2023, pp. 5902–12, doi:<a href=\"https://doi.org/10.1093/mnras/stad033\">10.1093/mnras/stad033</a>.","ieee":"D. González-Caniulef, I. Caiazzo, and J. Heyl, “Unbinned likelihood analysis for X-ray polarization,” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 519, no. 4. Oxford University Press, pp. 5902–5912, 2023.","ista":"González-Caniulef D, Caiazzo I, Heyl J. 2023. Unbinned likelihood analysis for X-ray polarization. Monthly Notices of the Royal Astronomical Society. 519(4), 5902–5912.","chicago":"González-Caniulef, Denis, Ilaria Caiazzo, and Jeremy Heyl. “Unbinned Likelihood Analysis for X-Ray Polarization.” <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press, 2023. <a href=\"https://doi.org/10.1093/mnras/stad033\">https://doi.org/10.1093/mnras/stad033</a>.","short":"D. González-Caniulef, I. Caiazzo, J. Heyl, Monthly Notices of the Royal Astronomical Society 519 (2023) 5902–5912."},"status":"public","date_created":"2024-03-26T09:49:52Z"},{"language":[{"iso":"eng"}],"volume":944,"doi":"10.3847/2041-8213/acb703","date_created":"2024-03-26T09:50:12Z","status":"public","citation":{"short":"S. Zane, R. Taverna, D. González–Caniulef, F. Muleri, R. Turolla, J. Heyl, K. Uchiyama, M. Ng, T. Tamagawa, I. Caiazzo, N. Di Lalla, H.L. Marshall, M. Bachetti, F. La Monaca, E. Gau, A. Di Marco, L. Baldini, M. Negro, N. Omodei, J. Rankin, G. Matt, G.G. Pavlov, T. Kitaguchi, H. Krawczynski, F. Kislat, R. Kelly, I. Agudo, L.A. Antonelli, W.H. Baumgartner, R. Bellazzini, S. Bianchi, S.D. Bongiorno, R. Bonino, A. Brez, N. Bucciantini, F. Capitanio, S. Castellano, E. Cavazzuti, C.-T. Chen, S. Ciprini, E. Costa, A. De Rosa, E. Del Monte, L. Di Gesu, I. Donnarumma, V. Doroshenko, M. Dovčiak, S.R. Ehlert, T. Enoto, Y. Evangelista, S. Fabiani, R. Ferrazzoli, J.A. Garcia, S. Gunji, K. Hayashida, W. Iwakiri, S.G. Jorstad, P. Kaaret, V. Karas, J.J. Kolodziejczak, L. Latronico, I. Liodakis, S. Maldera, A. Manfreda, F. Marin, A. Marinucci, A.P. Marscher, F. Massaro, I. Mitsuishi, T. Mizuno, C.-Y. Ng, S.L. O’Dell, C. Oppedisano, A. Papitto, A.L. Peirson, M. Perri, M. Pesce-Rollins, P.-O. Petrucci, M. Pilia, A. Possenti, J. Poutanen, S. Puccetti, B.D. Ramsey, A. Ratheesh, O.J. Roberts, R.W. Romani, C. Sgró, P. Slane, P. Soffitta, G. Spandre, D.A. Swartz, F. Tavecchio, Y. Tawara, A.F. Tennant, N.E. Thomas, F. Tombesi, A. Trois, S.S. Tsygankov, J. Vink, M.C. Weisskopf, K. Wu, F. Xie, The Astrophysical Journal Letters 944 (2023).","chicago":"Zane, Silvia, Roberto Taverna, Denis González–Caniulef, Fabio Muleri, Roberto Turolla, Jeremy Heyl, Keisuke Uchiyama, et al. “A Strong X-Ray Polarization Signal from the Magnetar 1RXS J170849.0-400910.” <i>The Astrophysical Journal Letters</i>. American Astronomical Society, 2023. <a href=\"https://doi.org/10.3847/2041-8213/acb703\">https://doi.org/10.3847/2041-8213/acb703</a>.","ista":"Zane S et al. 2023. A strong x-ray polarization signal from the magnetar 1RXS J170849.0-400910. The Astrophysical Journal Letters. 944(2), L27.","ama":"Zane S, Taverna R, González–Caniulef D, et al. A strong x-ray polarization signal from the magnetar 1RXS J170849.0-400910. <i>The Astrophysical Journal Letters</i>. 2023;944(2). doi:<a href=\"https://doi.org/10.3847/2041-8213/acb703\">10.3847/2041-8213/acb703</a>","mla":"Zane, Silvia, et al. “A Strong X-Ray Polarization Signal from the Magnetar 1RXS J170849.0-400910.” <i>The Astrophysical Journal Letters</i>, vol. 944, no. 2, L27, American Astronomical Society, 2023, doi:<a href=\"https://doi.org/10.3847/2041-8213/acb703\">10.3847/2041-8213/acb703</a>.","ieee":"S. Zane <i>et al.</i>, “A strong x-ray polarization signal from the magnetar 1RXS J170849.0-400910,” <i>The Astrophysical Journal Letters</i>, vol. 944, no. 2. American Astronomical Society, 2023.","apa":"Zane, S., Taverna, R., González–Caniulef, D., Muleri, F., Turolla, R., Heyl, J., … Xie, F. (2023). A strong x-ray polarization signal from the magnetar 1RXS J170849.0-400910. <i>The Astrophysical Journal Letters</i>. American Astronomical Society. <a href=\"https://doi.org/10.3847/2041-8213/acb703\">https://doi.org/10.3847/2041-8213/acb703</a>"},"issue":"2","month":"02","oa":1,"external_id":{"arxiv":["2301.12919"]},"article_processing_charge":"No","_id":"15202","quality_controlled":"1","extern":"1","scopus_import":"1","year":"2023","keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"abstract":[{"text":"Magnetars are the most strongly magnetized neutron stars, and one of the most promising targets for X-ray polarimetric measurements. We present here the first Imaging X-ray Polarimetry Explorer observation of the magnetar 1RXS J170849.0-400910, jointly analyzed with a new Swift observation and archival NICER data. The total (energy- and phase-integrated) emission in the 2–8 keV energy range is linerarly polarized, at a ∼35% level. The phase-averaged polarization signal shows a marked increase with energy, ranging from ∼20% at 2–3 keV up to ∼80% at 6–8 keV, while the polarization angle remains constant. This indicates that radiation is mostly polarized in a single direction. The spectrum is well reproduced by a combination of either two thermal (blackbody) components or a blackbody and a power law. Both the polarization degree and angle also show a variation with the spin phase, and the former is almost anticorrelated with the source counts in the 2–8 and 2–4 keV bands. We discuss the possible implications and interpretations, based on a joint analysis of the spectral, polarization, and pulsation properties of the source. A scenario in which the surface temperature is not homogeneous, with a hotter cap covered by a gaseous atmosphere and a warmer region in a condensed state, provides a satisfactory description of both the phase- and energy-dependent spectro-polarimetric data. The (comparatively) small size of the two emitting regions, required to explain the observed pulsations, does not allow to reach a robust conclusion about the presence of vacuum birefringence effects.","lang":"eng"}],"publisher":"American Astronomical Society","title":"A strong x-ray polarization signal from the magnetar 1RXS J170849.0-400910","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)"},"publication_status":"published","intvolume":"       944","day":"15","type":"journal_article","date_published":"2023-02-15T00:00:00Z","date_updated":"2024-04-02T07:15:41Z","publication":"The Astrophysical Journal Letters","article_number":"L27","article_type":"original","main_file_link":[{"url":"https://doi.org/10.3847/2041-8213/acb703","open_access":"1"}],"oa_version":"Published Version","arxiv":1,"publication_identifier":{"eissn":["2041-8213"],"issn":["2041-8205"]},"author":[{"last_name":"Zane","full_name":"Zane, Silvia","first_name":"Silvia"},{"full_name":"Taverna, Roberto","first_name":"Roberto","last_name":"Taverna"},{"last_name":"González–Caniulef","full_name":"González–Caniulef, Denis","first_name":"Denis"},{"first_name":"Fabio","full_name":"Muleri, Fabio","last_name":"Muleri"},{"last_name":"Turolla","full_name":"Turolla, Roberto","first_name":"Roberto"},{"full_name":"Heyl, Jeremy","first_name":"Jeremy","last_name":"Heyl"},{"first_name":"Keisuke","full_name":"Uchiyama, Keisuke","last_name":"Uchiyama"},{"full_name":"Ng, Mason","first_name":"Mason","last_name":"Ng"},{"full_name":"Tamagawa, Toru","first_name":"Toru","last_name":"Tamagawa"},{"first_name":"Ilaria","full_name":"Caiazzo, Ilaria","orcid":"0000-0002-4770-5388","last_name":"Caiazzo","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d"},{"last_name":"Di Lalla","first_name":"Niccolò","full_name":"Di Lalla, Niccolò"},{"full_name":"Marshall, Herman L.","first_name":"Herman L.","last_name":"Marshall"},{"full_name":"Bachetti, Matteo","first_name":"Matteo","last_name":"Bachetti"},{"last_name":"La Monaca","full_name":"La Monaca, Fabio","first_name":"Fabio"},{"full_name":"Gau, Ephraim","first_name":"Ephraim","last_name":"Gau"},{"full_name":"Di Marco, Alessandro","first_name":"Alessandro","last_name":"Di Marco"},{"full_name":"Baldini, Luca","first_name":"Luca","last_name":"Baldini"},{"first_name":"Michela","full_name":"Negro, Michela","last_name":"Negro"},{"last_name":"Omodei","full_name":"Omodei, Nicola","first_name":"Nicola"},{"first_name":"John","full_name":"Rankin, John","last_name":"Rankin"},{"last_name":"Matt","first_name":"Giorgio","full_name":"Matt, Giorgio"},{"full_name":"Pavlov, George G.","first_name":"George G.","last_name":"Pavlov"},{"first_name":"Takao","full_name":"Kitaguchi, Takao","last_name":"Kitaguchi"},{"first_name":"Henric","full_name":"Krawczynski, Henric","last_name":"Krawczynski"},{"last_name":"Kislat","full_name":"Kislat, Fabian","first_name":"Fabian"},{"first_name":"Ruth","full_name":"Kelly, Ruth","last_name":"Kelly"},{"last_name":"Agudo","first_name":"Iván","full_name":"Agudo, Iván"},{"last_name":"Antonelli","first_name":"Lucio A.","full_name":"Antonelli, Lucio A."},{"full_name":"Baumgartner, Wayne H.","first_name":"Wayne H.","last_name":"Baumgartner"},{"full_name":"Bellazzini, Ronaldo","first_name":"Ronaldo","last_name":"Bellazzini"},{"last_name":"Bianchi","first_name":"Stefano","full_name":"Bianchi, Stefano"},{"first_name":"Stephen D.","full_name":"Bongiorno, Stephen D.","last_name":"Bongiorno"},{"last_name":"Bonino","first_name":"Raffaella","full_name":"Bonino, Raffaella"},{"full_name":"Brez, Alessandro","first_name":"Alessandro","last_name":"Brez"},{"last_name":"Bucciantini","full_name":"Bucciantini, Niccolò","first_name":"Niccolò"},{"last_name":"Capitanio","full_name":"Capitanio, Fiamma","first_name":"Fiamma"},{"full_name":"Castellano, Simone","first_name":"Simone","last_name":"Castellano"},{"last_name":"Cavazzuti","first_name":"Elisabetta","full_name":"Cavazzuti, Elisabetta"},{"full_name":"Chen, Chieng-Ting","first_name":"Chieng-Ting","last_name":"Chen"},{"last_name":"Ciprini","full_name":"Ciprini, Stefano","first_name":"Stefano"},{"full_name":"Costa, Enrico","first_name":"Enrico","last_name":"Costa"},{"last_name":"De Rosa","first_name":"Alessandra","full_name":"De Rosa, Alessandra"},{"last_name":"Del Monte","full_name":"Del Monte, Ettore","first_name":"Ettore"},{"full_name":"Di Gesu, Laura","first_name":"Laura","last_name":"Di Gesu"},{"full_name":"Donnarumma, Immacolata","first_name":"Immacolata","last_name":"Donnarumma"},{"first_name":"Victor","full_name":"Doroshenko, Victor","last_name":"Doroshenko"},{"last_name":"Dovčiak","first_name":"Michal","full_name":"Dovčiak, Michal"},{"last_name":"Ehlert","first_name":"Steven R.","full_name":"Ehlert, Steven R."},{"last_name":"Enoto","first_name":"Teruaki","full_name":"Enoto, Teruaki"},{"last_name":"Evangelista","first_name":"Yuri","full_name":"Evangelista, Yuri"},{"last_name":"Fabiani","first_name":"Sergio","full_name":"Fabiani, Sergio"},{"last_name":"Ferrazzoli","full_name":"Ferrazzoli, Riccardo","first_name":"Riccardo"},{"full_name":"Garcia, Javier A.","first_name":"Javier A.","last_name":"Garcia"},{"last_name":"Gunji","first_name":"Shuichi","full_name":"Gunji, Shuichi"},{"first_name":"Kiyoshi","full_name":"Hayashida, Kiyoshi","last_name":"Hayashida"},{"last_name":"Iwakiri","first_name":"Wataru","full_name":"Iwakiri, Wataru"},{"full_name":"Jorstad, Svetlana G.","first_name":"Svetlana G.","last_name":"Jorstad"},{"last_name":"Kaaret","full_name":"Kaaret, Philip","first_name":"Philip"},{"last_name":"Karas","first_name":"Vladimir","full_name":"Karas, Vladimir"},{"full_name":"Kolodziejczak, Jeffery J.","first_name":"Jeffery J.","last_name":"Kolodziejczak"},{"full_name":"Latronico, Luca","first_name":"Luca","last_name":"Latronico"},{"last_name":"Liodakis","full_name":"Liodakis, Ioannis","first_name":"Ioannis"},{"last_name":"Maldera","first_name":"Simone","full_name":"Maldera, Simone"},{"full_name":"Manfreda, Alberto","first_name":"Alberto","last_name":"Manfreda"},{"last_name":"Marin","first_name":"Frédéric","full_name":"Marin, Frédéric"},{"last_name":"Marinucci","first_name":"Andrea","full_name":"Marinucci, Andrea"},{"first_name":"Alan P.","full_name":"Marscher, Alan P.","last_name":"Marscher"},{"full_name":"Massaro, Francesco","first_name":"Francesco","last_name":"Massaro"},{"first_name":"Ikuyuki","full_name":"Mitsuishi, Ikuyuki","last_name":"Mitsuishi"},{"first_name":"Tsunefumi","full_name":"Mizuno, Tsunefumi","last_name":"Mizuno"},{"first_name":"C.-Y.","full_name":"Ng, C.-Y.","last_name":"Ng"},{"full_name":"O’Dell, Stephen L.","first_name":"Stephen L.","last_name":"O’Dell"},{"last_name":"Oppedisano","first_name":"Chiara","full_name":"Oppedisano, Chiara"},{"last_name":"Papitto","first_name":"Alessandro","full_name":"Papitto, Alessandro"},{"last_name":"Peirson","first_name":"Abel L.","full_name":"Peirson, Abel L."},{"full_name":"Perri, Matteo","first_name":"Matteo","last_name":"Perri"},{"last_name":"Pesce-Rollins","first_name":"Melissa","full_name":"Pesce-Rollins, Melissa"},{"first_name":"Pierre-Olivier","full_name":"Petrucci, Pierre-Olivier","last_name":"Petrucci"},{"last_name":"Pilia","full_name":"Pilia, Maura","first_name":"Maura"},{"last_name":"Possenti","first_name":"Andrea","full_name":"Possenti, Andrea"},{"full_name":"Poutanen, Juri","first_name":"Juri","last_name":"Poutanen"},{"last_name":"Puccetti","full_name":"Puccetti, Simonetta","first_name":"Simonetta"},{"full_name":"Ramsey, Brian D.","first_name":"Brian D.","last_name":"Ramsey"},{"last_name":"Ratheesh","first_name":"Ajay","full_name":"Ratheesh, Ajay"},{"first_name":"Oliver J.","full_name":"Roberts, Oliver J.","last_name":"Roberts"},{"last_name":"Romani","full_name":"Romani, Roger W.","first_name":"Roger W."},{"full_name":"Sgró, Carmelo","first_name":"Carmelo","last_name":"Sgró"},{"last_name":"Slane","full_name":"Slane, Patrick","first_name":"Patrick"},{"last_name":"Soffitta","full_name":"Soffitta, Paolo","first_name":"Paolo"},{"full_name":"Spandre, Gloria","first_name":"Gloria","last_name":"Spandre"},{"first_name":"Douglas A.","full_name":"Swartz, Douglas A.","last_name":"Swartz"},{"last_name":"Tavecchio","first_name":"Fabrizio","full_name":"Tavecchio, Fabrizio"},{"full_name":"Tawara, Yuzuru","first_name":"Yuzuru","last_name":"Tawara"},{"last_name":"Tennant","full_name":"Tennant, Allyn F.","first_name":"Allyn F."},{"last_name":"Thomas","full_name":"Thomas, Nicholas E.","first_name":"Nicholas E."},{"full_name":"Tombesi, Francesco","first_name":"Francesco","last_name":"Tombesi"},{"first_name":"Alessio","full_name":"Trois, Alessio","last_name":"Trois"},{"full_name":"Tsygankov, Sergey S.","first_name":"Sergey S.","last_name":"Tsygankov"},{"full_name":"Vink, Jacco","first_name":"Jacco","last_name":"Vink"},{"full_name":"Weisskopf, Martin C.","first_name":"Martin C.","last_name":"Weisskopf"},{"last_name":"Wu","first_name":"Kinwah","full_name":"Wu, Kinwah"},{"last_name":"Xie","first_name":"Fei","full_name":"Xie, Fei"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87"},{"doi":"10.1017/s1743921322000916","language":[{"iso":"eng"}],"volume":16,"citation":{"apa":"Heyl, J., Caiazzo, I., &#38; González-Caniulef, D. (2023). X-ray polarization at the crossroads. <i>Proceedings of the International Astronomical Union</i>. Cambridge University Press. <a href=\"https://doi.org/10.1017/s1743921322000916\">https://doi.org/10.1017/s1743921322000916</a>","ieee":"J. Heyl, I. Caiazzo, and D. González-Caniulef, “X-ray polarization at the crossroads,” <i>Proceedings of the International Astronomical Union</i>, vol. 16, no. S363. Cambridge University Press, pp. 80–91, 2023.","mla":"Heyl, Jeremy, et al. “X-Ray Polarization at the Crossroads.” <i>Proceedings of the International Astronomical Union</i>, vol. 16, no. S363, Cambridge University Press, 2023, pp. 80–91, doi:<a href=\"https://doi.org/10.1017/s1743921322000916\">10.1017/s1743921322000916</a>.","ama":"Heyl J, Caiazzo I, González-Caniulef D. X-ray polarization at the crossroads. <i>Proceedings of the International Astronomical Union</i>. 2023;16(S363):80-91. doi:<a href=\"https://doi.org/10.1017/s1743921322000916\">10.1017/s1743921322000916</a>","ista":"Heyl J, Caiazzo I, González-Caniulef D. 2023. X-ray polarization at the crossroads. Proceedings of the International Astronomical Union. 16(S363), 80–91.","chicago":"Heyl, Jeremy, Ilaria Caiazzo, and Denis González-Caniulef. “X-Ray Polarization at the Crossroads.” <i>Proceedings of the International Astronomical Union</i>. Cambridge University Press, 2023. <a href=\"https://doi.org/10.1017/s1743921322000916\">https://doi.org/10.1017/s1743921322000916</a>.","short":"J. Heyl, I. Caiazzo, D. González-Caniulef, Proceedings of the International Astronomical Union 16 (2023) 80–91."},"issue":"S363","month":"02","date_created":"2024-03-26T10:35:20Z","status":"public","external_id":{"arxiv":["2203.09066"]},"oa":1,"_id":"15225","article_processing_charge":"No","quality_controlled":"1","scopus_import":"1","year":"2023","extern":"1","keyword":["Astronomy and Astrophysics","Space and Planetary Science"],"abstract":[{"text":"We argue that measurements of X-ray polarization using the recently launched Imaging X-ray Polarimetry Explorer will answer many open questions about magnetars in particular the physical state of their surfaces, whether vacuum birefringence exists, and the nature of the hard X-ray emission from these objects. We outline the capabilities of the instrument, specific models and the results of simulations for the magnetar 4U 0142+61.","lang":"eng"}],"title":"X-ray polarization at the crossroads","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)"},"publisher":"Cambridge University Press","intvolume":"        16","publication_status":"published","type":"journal_article","page":"80-91","day":"27","date_published":"2023-02-27T00:00:00Z","date_updated":"2024-04-04T09:46:17Z","publication":"Proceedings of the International Astronomical Union","oa_version":"Published Version","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1017/S1743921322000916"}],"arxiv":1,"article_type":"original","user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","publication_identifier":{"eissn":["1743-9221"],"issn":["1743-9213"]},"author":[{"full_name":"Heyl, Jeremy","first_name":"Jeremy","last_name":"Heyl"},{"orcid":"0000-0002-4770-5388","last_name":"Caiazzo","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","full_name":"Caiazzo, Ilaria","first_name":"Ilaria"},{"first_name":"Denis","full_name":"González-Caniulef, Denis","last_name":"González-Caniulef"}]},{"date_updated":"2024-04-04T12:54:59Z","publication":"Proceedings of the International Astronomical Union","article_type":"original","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1017/S1743921322000679"}],"oa_version":"Published Version","author":[{"first_name":"Denis","full_name":"González-Caniulef, Denis","last_name":"González-Caniulef"},{"first_name":"Ilaria","full_name":"Caiazzo, Ilaria","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","orcid":"0000-0002-4770-5388","last_name":"Caiazzo"},{"first_name":"Jeremy","full_name":"Heyl, Jeremy","last_name":"Heyl"}],"publication_identifier":{"eissn":["1743-9221"],"issn":["1743-9213"]},"user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","publication_status":"published","intvolume":"        16","day":"27","page":"314-317","type":"journal_article","date_published":"2023-02-27T00:00:00Z","extern":"1","scopus_import":"1","year":"2023","keyword":["Astronomy and Astrophysics","Space and Planetary Science"],"abstract":[{"text":"Due to the rich phenomenology and extreme magnetic conditions, magnetars will be targets of great interest for the upcoming polarimetry space missions. In particular, the Imaging X-ray Polarimetry Explorer (IXPE), recently launched in December 2021, will operate in the 2–8 keV range. This will open a new window to study the polarized, persistent X-ray emission from magnetars. In this talk, I will present simulations of IXPE observations of magnetars using the IXPEObsSim package. I will discuss future prospect to discriminate between different magnetar’s emission mechanisms, as well as a potential detection of the signal of vacuum birefringence using IXPE.\r\n\r\n","lang":"eng"}],"publisher":"Cambridge University Press","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)"},"title":"IXPE simulations for magnetars","language":[{"iso":"eng"}],"volume":16,"doi":"10.1017/s1743921322000679","date_created":"2024-03-26T10:35:43Z","status":"public","issue":"S363","citation":{"apa":"González-Caniulef, D., Caiazzo, I., &#38; Heyl, J. (2023). IXPE simulations for magnetars. <i>Proceedings of the International Astronomical Union</i>. Cambridge University Press. <a href=\"https://doi.org/10.1017/s1743921322000679\">https://doi.org/10.1017/s1743921322000679</a>","ama":"González-Caniulef D, Caiazzo I, Heyl J. IXPE simulations for magnetars. <i>Proceedings of the International Astronomical Union</i>. 2023;16(S363):314-317. doi:<a href=\"https://doi.org/10.1017/s1743921322000679\">10.1017/s1743921322000679</a>","mla":"González-Caniulef, Denis, et al. “IXPE Simulations for Magnetars.” <i>Proceedings of the International Astronomical Union</i>, vol. 16, no. S363, Cambridge University Press, 2023, pp. 314–17, doi:<a href=\"https://doi.org/10.1017/s1743921322000679\">10.1017/s1743921322000679</a>.","ieee":"D. González-Caniulef, I. Caiazzo, and J. Heyl, “IXPE simulations for magnetars,” <i>Proceedings of the International Astronomical Union</i>, vol. 16, no. S363. Cambridge University Press, pp. 314–317, 2023.","chicago":"González-Caniulef, Denis, Ilaria Caiazzo, and Jeremy Heyl. “IXPE Simulations for Magnetars.” <i>Proceedings of the International Astronomical Union</i>. Cambridge University Press, 2023. <a href=\"https://doi.org/10.1017/s1743921322000679\">https://doi.org/10.1017/s1743921322000679</a>.","ista":"González-Caniulef D, Caiazzo I, Heyl J. 2023. IXPE simulations for magnetars. Proceedings of the International Astronomical Union. 16(S363), 314–317.","short":"D. González-Caniulef, I. Caiazzo, J. Heyl, Proceedings of the International Astronomical Union 16 (2023) 314–317."},"month":"02","oa":1,"_id":"15226","article_processing_charge":"No","quality_controlled":"1"}]