[{"article_type":"original","publisher":"Springer Nature","extern":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","language":[{"iso":"eng"}],"scopus_import":"1","date_created":"2024-03-20T10:41:36Z","issue":"7944","page":"582-587","intvolume":"       613","_id":"15130","pmid":1,"date_published":"2023-01-04T00:00:00Z","publication_identifier":{"eissn":["1476-4687"],"issn":["0028-0836"]},"type":"journal_article","main_file_link":[{"url":"https://doi.org/10.1038/s41586-022-05560-w","open_access":"1"}],"title":"RNA targeting unleashes indiscriminate nuclease activity of CRISPR–Cas12a2","author":[{"full_name":"Bravo, Jack Peter Kelly","last_name":"Bravo","id":"96aecfa5-8931-11ee-af30-aa6a5d6eee0e","orcid":"0000-0003-0456-0753","first_name":"Jack Peter Kelly"},{"full_name":"Hallmark, Thomson","last_name":"Hallmark","first_name":"Thomson"},{"last_name":"Naegle","first_name":"Bronson","full_name":"Naegle, Bronson"},{"full_name":"Beisel, Chase L.","last_name":"Beisel","first_name":"Chase L."},{"full_name":"Jackson, Ryan N.","first_name":"Ryan N.","last_name":"Jackson"},{"full_name":"Taylor, David W.","first_name":"David W.","last_name":"Taylor"}],"abstract":[{"lang":"eng","text":"Cas12a2 is a CRISPR-associated nuclease that performs RNA-guided, sequence-nonspecific degradation of single-stranded RNA, single-stranded DNA and double-stranded DNA following recognition of a complementary RNA target, culminating in abortive infection<jats:sup>1</jats:sup>. Here we report structures of Cas12a2 in binary, ternary and quaternary complexes to reveal a complete activation pathway. Our structures reveal that Cas12a2 is autoinhibited until binding a cognate RNA target, which exposes the RuvC active site within a large, positively charged cleft. Double-stranded DNA substrates are captured through duplex distortion and local melting, stabilized by pairs of ‘aromatic clamp’ residues that are crucial for double-stranded DNA degradation and in vivo immune system function. Our work provides a structural basis for this mechanism of abortive infection to achieve population-level immunity, which can be leveraged to create rational mutants that degrade a spectrum of collateral substrates."}],"quality_controlled":"1","external_id":{"pmid":["36599980"]},"year":"2023","citation":{"chicago":"Bravo, Jack Peter Kelly, Thomson Hallmark, Bronson Naegle, Chase L. Beisel, Ryan N. Jackson, and David W. Taylor. “RNA Targeting Unleashes Indiscriminate Nuclease Activity of CRISPR–Cas12a2.” <i>Nature</i>. Springer Nature, 2023. <a href=\"https://doi.org/10.1038/s41586-022-05560-w\">https://doi.org/10.1038/s41586-022-05560-w</a>.","mla":"Bravo, Jack Peter Kelly, et al. “RNA Targeting Unleashes Indiscriminate Nuclease Activity of CRISPR–Cas12a2.” <i>Nature</i>, vol. 613, no. 7944, Springer Nature, 2023, pp. 582–87, doi:<a href=\"https://doi.org/10.1038/s41586-022-05560-w\">10.1038/s41586-022-05560-w</a>.","ista":"Bravo JPK, Hallmark T, Naegle B, Beisel CL, Jackson RN, Taylor DW. 2023. RNA targeting unleashes indiscriminate nuclease activity of CRISPR–Cas12a2. Nature. 613(7944), 582–587.","short":"J.P.K. Bravo, T. Hallmark, B. Naegle, C.L. Beisel, R.N. Jackson, D.W. Taylor, Nature 613 (2023) 582–587.","apa":"Bravo, J. P. K., Hallmark, T., Naegle, B., Beisel, C. L., Jackson, R. N., &#38; Taylor, D. W. (2023). RNA targeting unleashes indiscriminate nuclease activity of CRISPR–Cas12a2. <i>Nature</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41586-022-05560-w\">https://doi.org/10.1038/s41586-022-05560-w</a>","ama":"Bravo JPK, Hallmark T, Naegle B, Beisel CL, Jackson RN, Taylor DW. RNA targeting unleashes indiscriminate nuclease activity of CRISPR–Cas12a2. <i>Nature</i>. 2023;613(7944):582-587. doi:<a href=\"https://doi.org/10.1038/s41586-022-05560-w\">10.1038/s41586-022-05560-w</a>","ieee":"J. P. K. Bravo, T. Hallmark, B. Naegle, C. L. Beisel, R. N. Jackson, and D. W. Taylor, “RNA targeting unleashes indiscriminate nuclease activity of CRISPR–Cas12a2,” <i>Nature</i>, vol. 613, no. 7944. Springer Nature, pp. 582–587, 2023."},"month":"01","publication":"Nature","date_updated":"2024-06-04T06:30:59Z","doi":"10.1038/s41586-022-05560-w","publication_status":"published","status":"public","oa_version":"Published Version","oa":1,"day":"04","article_processing_charge":"Yes (in subscription journal)","volume":613},{"status":"public","publication_status":"published","doi":"10.1038/s41586-023-06282-3","date_updated":"2024-03-25T12:42:29Z","volume":619,"day":"05","article_processing_charge":"No","oa":1,"oa_version":"Published Version","year":"2023","citation":{"ieee":"A. K. Michael <i>et al.</i>, “Cooperation between bHLH transcription factors and histones for DNA access,” <i>Nature</i>, vol. 619, no. 7969. Springer Nature, pp. 385–393, 2023.","mla":"Michael, Alicia K., et al. “Cooperation between BHLH Transcription Factors and Histones for DNA Access.” <i>Nature</i>, vol. 619, no. 7969, Springer Nature, 2023, pp. 385–93, doi:<a href=\"https://doi.org/10.1038/s41586-023-06282-3\">10.1038/s41586-023-06282-3</a>.","short":"A.K. Michael, L. Stoos, P. Crosby, N. Eggers, X.Y. Nie, K. Makasheva, M. Minnich, K.L. Healy, J. Weiss, G. Kempf, S. Cavadini, L. Kater, J. Seebacher, L. Vecchia, D. Chakraborty, L. Isbel, R.S. Grand, F. Andersch, J.L. Fribourgh, D. Schübeler, J. Zuber, A.C. Liu, P.B. Becker, B. Fierz, C.L. Partch, J.S. Menet, N.H. Thomä, Nature 619 (2023) 385–393.","ista":"Michael AK, Stoos L, Crosby P, Eggers N, Nie XY, Makasheva K, Minnich M, Healy KL, Weiss J, Kempf G, Cavadini S, Kater L, Seebacher J, Vecchia L, Chakraborty D, Isbel L, Grand RS, Andersch F, Fribourgh JL, Schübeler D, Zuber J, Liu AC, Becker PB, Fierz B, Partch CL, Menet JS, Thomä NH. 2023. Cooperation between bHLH transcription factors and histones for DNA access. Nature. 619(7969), 385–393.","chicago":"Michael, Alicia K., Lisa Stoos, Priya Crosby, Nikolas Eggers, Xinyu Y. Nie, Kristina Makasheva, Martina Minnich, et al. “Cooperation between BHLH Transcription Factors and Histones for DNA Access.” <i>Nature</i>. Springer Nature, 2023. <a href=\"https://doi.org/10.1038/s41586-023-06282-3\">https://doi.org/10.1038/s41586-023-06282-3</a>.","apa":"Michael, A. K., Stoos, L., Crosby, P., Eggers, N., Nie, X. Y., Makasheva, K., … Thomä, N. H. (2023). Cooperation between bHLH transcription factors and histones for DNA access. <i>Nature</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41586-023-06282-3\">https://doi.org/10.1038/s41586-023-06282-3</a>","ama":"Michael AK, Stoos L, Crosby P, et al. Cooperation between bHLH transcription factors and histones for DNA access. <i>Nature</i>. 2023;619(7969):385-393. doi:<a href=\"https://doi.org/10.1038/s41586-023-06282-3\">10.1038/s41586-023-06282-3</a>"},"month":"07","publication":"Nature","title":"Cooperation between bHLH transcription factors and histones for DNA access","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1038/s41586-023-06282-3"}],"type":"journal_article","publication_identifier":{"eissn":["1476-4687"],"issn":["0028-0836"]},"quality_controlled":"1","abstract":[{"text":"The basic helix–loop–helix (bHLH) family of transcription factors recognizes DNA motifs known as E-boxes (CANNTG) and includes 108 members<jats:sup>1</jats:sup>. Here we investigate how chromatinized E-boxes are engaged by two structurally diverse bHLH proteins: the proto-oncogene MYC-MAX and the circadian transcription factor CLOCK-BMAL1 (refs. <jats:sup>2,3</jats:sup>). Both transcription factors bind to E-boxes preferentially near the nucleosomal entry–exit sites. Structural studies with engineered or native nucleosome sequences show that MYC-MAX or CLOCK-BMAL1 triggers the release of DNA from histones to gain access. Atop the H2A–H2B acidic patch<jats:sup>4</jats:sup>, the CLOCK-BMAL1 Per-Arnt-Sim (PAS) dimerization domains engage the histone octamer disc. Binding of tandem E-boxes<jats:sup>5–7</jats:sup> at endogenous DNA sequences occurs through direct interactions between two CLOCK-BMAL1 protomers and histones and is important for circadian cycling. At internal E-boxes, the MYC-MAX leucine zipper can also interact with histones H2B and H3, and its binding is indirectly enhanced by OCT4 elsewhere on the nucleosome. The nucleosomal E-box position and the type of bHLH dimerization domain jointly determine the histone contact, the affinity and the degree of competition and cooperativity with other nucleosome-bound factors.","lang":"eng"}],"author":[{"first_name":"Alicia","id":"6437c950-2a03-11ee-914d-d6476dd7b75c","orcid":"0000-0002-6080-839X","last_name":"Michael","full_name":"Michael, Alicia"},{"first_name":"Lisa","last_name":"Stoos","full_name":"Stoos, Lisa"},{"full_name":"Crosby, Priya","last_name":"Crosby","first_name":"Priya"},{"full_name":"Eggers, Nikolas","first_name":"Nikolas","last_name":"Eggers"},{"first_name":"Xinyu Y.","last_name":"Nie","full_name":"Nie, Xinyu Y."},{"full_name":"Makasheva, Kristina","first_name":"Kristina","last_name":"Makasheva"},{"first_name":"Martina","last_name":"Minnich","full_name":"Minnich, Martina"},{"full_name":"Healy, Kelly L.","first_name":"Kelly L.","last_name":"Healy"},{"full_name":"Weiss, Joscha","last_name":"Weiss","first_name":"Joscha"},{"first_name":"Georg","last_name":"Kempf","full_name":"Kempf, Georg"},{"last_name":"Cavadini","first_name":"Simone","full_name":"Cavadini, Simone"},{"full_name":"Kater, Lukas","first_name":"Lukas","last_name":"Kater"},{"full_name":"Seebacher, Jan","first_name":"Jan","last_name":"Seebacher"},{"full_name":"Vecchia, Luca","last_name":"Vecchia","first_name":"Luca"},{"full_name":"Chakraborty, Deyasini","first_name":"Deyasini","last_name":"Chakraborty"},{"full_name":"Isbel, Luke","last_name":"Isbel","first_name":"Luke"},{"first_name":"Ralph S.","last_name":"Grand","full_name":"Grand, Ralph S."},{"full_name":"Andersch, Florian","first_name":"Florian","last_name":"Andersch"},{"last_name":"Fribourgh","first_name":"Jennifer L.","full_name":"Fribourgh, Jennifer L."},{"full_name":"Schübeler, Dirk","last_name":"Schübeler","first_name":"Dirk"},{"full_name":"Zuber, Johannes","last_name":"Zuber","first_name":"Johannes"},{"full_name":"Liu, Andrew C.","last_name":"Liu","first_name":"Andrew C."},{"full_name":"Becker, Peter B.","first_name":"Peter B.","last_name":"Becker"},{"full_name":"Fierz, Beat","first_name":"Beat","last_name":"Fierz"},{"full_name":"Partch, Carrie L.","first_name":"Carrie L.","last_name":"Partch"},{"full_name":"Menet, Jerome S.","first_name":"Jerome S.","last_name":"Menet"},{"first_name":"Nicolas H.","last_name":"Thomä","full_name":"Thomä, Nicolas H."}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","extern":"1","publisher":"Springer Nature","article_type":"original","date_published":"2023-07-05T00:00:00Z","intvolume":"       619","_id":"15148","page":"385-393","date_created":"2024-03-21T07:52:44Z","issue":"7969","scopus_import":"1","language":[{"iso":"eng"}]},{"extern":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Springer Nature","article_type":"original","pmid":1,"date_published":"2023-06-29T00:00:00Z","page":"948-957","intvolume":"        30","_id":"15149","scopus_import":"1","date_created":"2024-03-21T07:53:24Z","issue":"7","language":[{"iso":"eng"}],"title":"Readout of histone methylation by Trim24 locally restricts chromatin opening by p53","main_file_link":[{"url":"https://doi.org/10.1038/s41594-023-01021-8","open_access":"1"}],"keyword":["Molecular Biology","Structural Biology"],"publication_identifier":{"issn":["1545-9993"],"eissn":["1545-9985"]},"type":"journal_article","quality_controlled":"1","abstract":[{"text":"The genomic binding sites of the transcription factor (TF) and tumor suppressor p53 are unusually diverse with regard to their chromatin features, including histone modifications, raising the possibility that the local chromatin environment can contextualize p53 regulation. Here, we show that epigenetic characteristics of closed chromatin, such as DNA methylation, do not influence the binding of p53 across the genome. Instead, the ability of p53 to open chromatin and activate its target genes is locally restricted by its cofactor Trim24. Trim24 binds to both p53 and unmethylated histone 3 lysine 4 (H3K4), thereby preferentially localizing to those p53 sites that reside in closed chromatin, whereas it is deterred from accessible chromatin by H3K4 methylation. The presence of Trim24 increases cell viability upon stress and enables p53 to affect gene expression as a function of the local chromatin state. These findings link H3K4 methylation to p53 function and illustrate how specificity in chromatin can be achieved, not by TF-intrinsic sensitivity to histone modifications, but by employing chromatin-sensitive cofactors that locally modulate TF function.","lang":"eng"}],"author":[{"first_name":"Luke","last_name":"Isbel","full_name":"Isbel, Luke"},{"last_name":"Iskar","first_name":"Murat","full_name":"Iskar, Murat"},{"full_name":"Durdu, Sevi","first_name":"Sevi","last_name":"Durdu"},{"last_name":"Weiss","first_name":"Joscha","full_name":"Weiss, Joscha"},{"first_name":"Ralph S.","last_name":"Grand","full_name":"Grand, Ralph S."},{"full_name":"Hietter-Pfeiffer, Eric","first_name":"Eric","last_name":"Hietter-Pfeiffer"},{"full_name":"Kozicka, Zuzanna","last_name":"Kozicka","first_name":"Zuzanna"},{"first_name":"Alicia","id":"6437c950-2a03-11ee-914d-d6476dd7b75c","orcid":"0000-0002-6080-839X","last_name":"Michael","full_name":"Michael, Alicia"},{"full_name":"Burger, Lukas","first_name":"Lukas","last_name":"Burger"},{"last_name":"Thomä","first_name":"Nicolas H.","full_name":"Thomä, Nicolas H."},{"full_name":"Schübeler, Dirk","first_name":"Dirk","last_name":"Schübeler"}],"external_id":{"pmid":["37386214"]},"year":"2023","citation":{"ieee":"L. Isbel <i>et al.</i>, “Readout of histone methylation by Trim24 locally restricts chromatin opening by p53,” <i>Nature Structural &#38; Molecular Biology</i>, vol. 30, no. 7. Springer Nature, pp. 948–957, 2023.","chicago":"Isbel, Luke, Murat Iskar, Sevi Durdu, Joscha Weiss, Ralph S. Grand, Eric Hietter-Pfeiffer, Zuzanna Kozicka, et al. “Readout of Histone Methylation by Trim24 Locally Restricts Chromatin Opening by P53.” <i>Nature Structural &#38; Molecular Biology</i>. Springer Nature, 2023. <a href=\"https://doi.org/10.1038/s41594-023-01021-8\">https://doi.org/10.1038/s41594-023-01021-8</a>.","mla":"Isbel, Luke, et al. “Readout of Histone Methylation by Trim24 Locally Restricts Chromatin Opening by P53.” <i>Nature Structural &#38; Molecular Biology</i>, vol. 30, no. 7, Springer Nature, 2023, pp. 948–57, doi:<a href=\"https://doi.org/10.1038/s41594-023-01021-8\">10.1038/s41594-023-01021-8</a>.","ista":"Isbel L, Iskar M, Durdu S, Weiss J, Grand RS, Hietter-Pfeiffer E, Kozicka Z, Michael AK, Burger L, Thomä NH, Schübeler D. 2023. Readout of histone methylation by Trim24 locally restricts chromatin opening by p53. Nature Structural &#38; Molecular Biology. 30(7), 948–957.","short":"L. Isbel, M. Iskar, S. Durdu, J. Weiss, R.S. Grand, E. Hietter-Pfeiffer, Z. Kozicka, A.K. Michael, L. Burger, N.H. Thomä, D. Schübeler, Nature Structural &#38; Molecular Biology 30 (2023) 948–957.","ama":"Isbel L, Iskar M, Durdu S, et al. Readout of histone methylation by Trim24 locally restricts chromatin opening by p53. <i>Nature Structural &#38; Molecular Biology</i>. 2023;30(7):948-957. doi:<a href=\"https://doi.org/10.1038/s41594-023-01021-8\">10.1038/s41594-023-01021-8</a>","apa":"Isbel, L., Iskar, M., Durdu, S., Weiss, J., Grand, R. S., Hietter-Pfeiffer, E., … Schübeler, D. (2023). Readout of histone methylation by Trim24 locally restricts chromatin opening by p53. <i>Nature Structural &#38; Molecular Biology</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41594-023-01021-8\">https://doi.org/10.1038/s41594-023-01021-8</a>"},"publication":"Nature Structural & Molecular Biology","month":"06","doi":"10.1038/s41594-023-01021-8","publication_status":"published","status":"public","date_updated":"2024-03-25T12:37:20Z","day":"29","article_processing_charge":"No","volume":30,"oa":1,"oa_version":"Published Version"},{"file_date_updated":"2024-03-25T07:21:52Z","file":[{"content_type":"application/pdf","creator":"dernst","date_updated":"2024-03-25T07:21:52Z","file_size":598097,"checksum":"d1d0e0a854a79ae95fb66d75d9117a68","access_level":"open_access","relation":"main_file","date_created":"2024-03-25T07:21:52Z","success":1,"file_id":"15174","file_name":"2023_ComptesRendusMath_Kwan.pdf"}],"day":"01","article_processing_charge":"Yes","volume":361,"oa_version":"Published Version","oa":1,"doi":"10.5802/crmath.423","status":"public","publication_status":"published","ddc":["510"],"date_updated":"2025-09-09T14:26:32Z","publication":"Comptes Rendus Mathematique","month":"02","has_accepted_license":"1","external_id":{"arxiv":["2112.03788"],"isi":["001167671400009"]},"citation":{"ieee":"M. A. Kwan, A. Sah, and M. Sawhney, “Enumerating matroids and linear spaces,” <i>Comptes Rendus Mathematique</i>, vol. 361, no. G2. Academie des Sciences, pp. 565–575, 2023.","ama":"Kwan MA, Sah A, Sawhney M. Enumerating matroids and linear spaces. <i>Comptes Rendus Mathematique</i>. 2023;361(G2):565-575. doi:<a href=\"https://doi.org/10.5802/crmath.423\">10.5802/crmath.423</a>","apa":"Kwan, M. A., Sah, A., &#38; Sawhney, M. (2023). Enumerating matroids and linear spaces. <i>Comptes Rendus Mathematique</i>. Academie des Sciences. <a href=\"https://doi.org/10.5802/crmath.423\">https://doi.org/10.5802/crmath.423</a>","mla":"Kwan, Matthew Alan, et al. “Enumerating Matroids and Linear Spaces.” <i>Comptes Rendus Mathematique</i>, vol. 361, no. G2, Academie des Sciences, 2023, pp. 565–75, doi:<a href=\"https://doi.org/10.5802/crmath.423\">10.5802/crmath.423</a>.","short":"M.A. Kwan, A. Sah, M. Sawhney, Comptes Rendus Mathematique 361 (2023) 565–575.","ista":"Kwan MA, Sah A, Sawhney M. 2023. Enumerating matroids and linear spaces. Comptes Rendus Mathematique. 361(G2), 565–575.","chicago":"Kwan, Matthew Alan, Ashwin Sah, and Mehtaab Sawhney. “Enumerating Matroids and Linear Spaces.” <i>Comptes Rendus Mathematique</i>. Academie des Sciences, 2023. <a href=\"https://doi.org/10.5802/crmath.423\">https://doi.org/10.5802/crmath.423</a>."},"year":"2023","abstract":[{"lang":"eng","text":"We show that the number of linear spaces on a set of n points and the number of rank-3 matroids on a ground set of size n are both of the form (cn+o(n))n2/6, where c=e3√/2−3(1+3–√)/2. This is the final piece of the puzzle for enumerating fixed-rank matroids at this level of accuracy: the numbers of rank-1 and rank-2 matroids on a ground set of size n have exact representations in terms of well-known combinatorial functions, and it was recently proved by van der Hofstad, Pendavingh, and van der Pol that for constant r≥4 there are (e1−rn+o(n))nr−1/r! rank-r matroids on a ground set of size n. In our proof, we introduce a new approach for bounding the number of clique decompositions of a complete graph, using quasirandomness instead of the so-called entropy method that is common in this area."}],"quality_controlled":"1","author":[{"full_name":"Kwan, Matthew Alan","last_name":"Kwan","orcid":"0000-0002-4003-7567","first_name":"Matthew Alan","id":"5fca0887-a1db-11eb-95d1-ca9d5e0453b3"},{"full_name":"Sah, Ashwin","first_name":"Ashwin","last_name":"Sah"},{"first_name":"Mehtaab","last_name":"Sawhney","full_name":"Sawhney, Mehtaab"}],"department":[{"_id":"MaKw"}],"tmp":{"short":"CC BY (4.0)","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"},"title":"Enumerating matroids and linear spaces","arxiv":1,"publication_identifier":{"issn":["1631-073X"],"eissn":["1778-3569"]},"type":"journal_article","page":"565-575","_id":"15173","intvolume":"       361","date_published":"2023-02-01T00:00:00Z","acknowledgement":"Sah and Sawhney were supported by NSF Graduate Research Fellowship Program DGE-1745302. Sah was supported by the PD Soros Fellowship.\r\nWe thank Michael Simkin for helpful comments on the manuscript. We thank Zach Hunter for\r\nseveral corrections.","language":[{"iso":"eng"}],"scopus_import":"1","date_created":"2024-03-24T23:01:00Z","issue":"G2","publisher":"Academie des Sciences","article_type":"original","isi":1,"user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345"},{"oa_version":"Published Version","oa":1,"article_processing_charge":"No","day":"01","volume":527,"date_updated":"2024-04-02T06:51:04Z","doi":"10.1093/mnras/stad3680","publication_status":"published","status":"public","publication":"Monthly Notices of the Royal Astronomical Society","month":"12","external_id":{"arxiv":["2311.03637"]},"year":"2023","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>.","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.","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>.","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>","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>"},"author":[{"last_name":"Heyl","first_name":"Jeremy","full_name":"Heyl, Jeremy"},{"full_name":"Taverna, Roberto","first_name":"Roberto","last_name":"Taverna"},{"full_name":"Turolla, Roberto","last_name":"Turolla","first_name":"Roberto"},{"full_name":"Israel, Gian Luca","first_name":"Gian Luca","last_name":"Israel"},{"last_name":"Ng","first_name":"Mason","full_name":"Ng, Mason"},{"full_name":"Kırmızıbayrak, Demet","last_name":"Kırmızıbayrak","first_name":"Demet"},{"first_name":"Denis","last_name":"González-Caniulef","full_name":"González-Caniulef, Denis"},{"full_name":"Caiazzo, Ilaria","last_name":"Caiazzo","orcid":"0000-0002-4770-5388","first_name":"Ilaria","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d"},{"full_name":"Zane, Silvia","first_name":"Silvia","last_name":"Zane"},{"full_name":"Ehlert, Steven R","last_name":"Ehlert","first_name":"Steven R"},{"first_name":"Michela","last_name":"Negro","full_name":"Negro, Michela"},{"full_name":"Agudo, Iván","last_name":"Agudo","first_name":"Iván"},{"first_name":"Lucio Angelo","last_name":"Antonelli","full_name":"Antonelli, Lucio Angelo"},{"first_name":"Matteo","last_name":"Bachetti","full_name":"Bachetti, Matteo"},{"first_name":"Luca","last_name":"Baldini","full_name":"Baldini, Luca"},{"full_name":"Baumgartner, Wayne H","first_name":"Wayne H","last_name":"Baumgartner"},{"first_name":"Ronaldo","last_name":"Bellazzini","full_name":"Bellazzini, Ronaldo"},{"full_name":"Bianchi, Stefano","first_name":"Stefano","last_name":"Bianchi"},{"last_name":"Bongiorno","first_name":"Stephen D","full_name":"Bongiorno, Stephen D"},{"full_name":"Bonino, Raffaella","first_name":"Raffaella","last_name":"Bonino"},{"full_name":"Brez, Alessandro","first_name":"Alessandro","last_name":"Brez"},{"full_name":"Bucciantini, Niccolò","first_name":"Niccolò","last_name":"Bucciantini"},{"full_name":"Capitanio, Fiamma","first_name":"Fiamma","last_name":"Capitanio"},{"full_name":"Castellano, Simone","last_name":"Castellano","first_name":"Simone"},{"full_name":"Cavazzuti, Elisabetta","first_name":"Elisabetta","last_name":"Cavazzuti"},{"first_name":"Chien-Ting","last_name":"Chen","full_name":"Chen, Chien-Ting"},{"first_name":"Stefano","last_name":"Ciprini","full_name":"Ciprini, Stefano"},{"full_name":"Costa, Enrico","last_name":"Costa","first_name":"Enrico"},{"full_name":"De Rosa, Alessandra","last_name":"De Rosa","first_name":"Alessandra"},{"last_name":"Del Monte","first_name":"Ettore","full_name":"Del Monte, Ettore"},{"full_name":"Di Gesu, Laura","last_name":"Di Gesu","first_name":"Laura"},{"full_name":"Di Lalla, Niccolò","last_name":"Di Lalla","first_name":"Niccolò"},{"full_name":"Di Marco, Alessandro","first_name":"Alessandro","last_name":"Di Marco"},{"last_name":"Donnarumma","first_name":"Immacolata","full_name":"Donnarumma, Immacolata"},{"full_name":"Doroshenko, Victor","first_name":"Victor","last_name":"Doroshenko"},{"last_name":"Dovčiak","first_name":"Michal","full_name":"Dovčiak, Michal"},{"full_name":"Enoto, Teruaki","last_name":"Enoto","first_name":"Teruaki"},{"full_name":"Evangelista, Yuri","last_name":"Evangelista","first_name":"Yuri"},{"full_name":"Fabiani, Sergio","last_name":"Fabiani","first_name":"Sergio"},{"full_name":"Ferrazzoli, Riccardo","first_name":"Riccardo","last_name":"Ferrazzoli"},{"full_name":"Garcia, Javier A","first_name":"Javier A","last_name":"Garcia"},{"first_name":"Shuichi","last_name":"Gunji","full_name":"Gunji, Shuichi"},{"full_name":"Hayashida, Kiyoshi","first_name":"Kiyoshi","last_name":"Hayashida"},{"first_name":"Wataru","last_name":"Iwakiri","full_name":"Iwakiri, Wataru"},{"first_name":"Svetlana G","last_name":"Jorstad","full_name":"Jorstad, Svetlana G"},{"first_name":"Philip","last_name":"Kaaret","full_name":"Kaaret, Philip"},{"full_name":"Karas, Vladimir","first_name":"Vladimir","last_name":"Karas"},{"full_name":"Kislat, Fabian","last_name":"Kislat","first_name":"Fabian"},{"full_name":"Kitaguchi, Takao","last_name":"Kitaguchi","first_name":"Takao"},{"last_name":"Kolodziejczak","first_name":"Jeffery J","full_name":"Kolodziejczak, Jeffery J"},{"last_name":"Krawczynski","first_name":"Henric","full_name":"Krawczynski, Henric"},{"first_name":"Fabio La","last_name":"Monaca","full_name":"Monaca, Fabio La"},{"last_name":"Latronico","first_name":"Luca","full_name":"Latronico, Luca"},{"full_name":"Liodakis, Ioannis","last_name":"Liodakis","first_name":"Ioannis"},{"last_name":"Maldera","first_name":"Simone","full_name":"Maldera, Simone"},{"first_name":"Alberto","last_name":"Manfreda","full_name":"Manfreda, Alberto"},{"first_name":"Frédéric","last_name":"Marin","full_name":"Marin, Frédéric"},{"last_name":"Marinucci","first_name":"Andrea","full_name":"Marinucci, Andrea"},{"full_name":"Marscher, Alan P","first_name":"Alan P","last_name":"Marscher"},{"first_name":"Herman L","last_name":"Marshall","full_name":"Marshall, Herman L"},{"first_name":"Francesco","last_name":"Massaro","full_name":"Massaro, Francesco"},{"last_name":"Matt","first_name":"Giorgio","full_name":"Matt, Giorgio"},{"full_name":"Mitsuishi, Ikuyuki","last_name":"Mitsuishi","first_name":"Ikuyuki"},{"full_name":"Mizuno, Tsunefumi","last_name":"Mizuno","first_name":"Tsunefumi"},{"full_name":"Muleri, Fabio","first_name":"Fabio","last_name":"Muleri"},{"last_name":"Ng","first_name":"C-Y","full_name":"Ng, C-Y"},{"full_name":"O’Dell, Stephen L","last_name":"O’Dell","first_name":"Stephen L"},{"full_name":"Omodei, Nicola","first_name":"Nicola","last_name":"Omodei"},{"last_name":"Oppedisano","first_name":"Chiara","full_name":"Oppedisano, Chiara"},{"first_name":"Alessandro","last_name":"Papitto","full_name":"Papitto, Alessandro"},{"first_name":"George G","last_name":"Pavlov","full_name":"Pavlov, George G"},{"full_name":"Peirson, Abel Lawrence","last_name":"Peirson","first_name":"Abel Lawrence"},{"full_name":"Perri, Matteo","last_name":"Perri","first_name":"Matteo"},{"full_name":"Pesce-Rollins, Melissa","first_name":"Melissa","last_name":"Pesce-Rollins"},{"first_name":"Pierre-Olivier","last_name":"Petrucci","full_name":"Petrucci, Pierre-Olivier"},{"full_name":"Pilia, Maura","last_name":"Pilia","first_name":"Maura"},{"full_name":"Possenti, Andrea","last_name":"Possenti","first_name":"Andrea"},{"full_name":"Poutanen, Juri","first_name":"Juri","last_name":"Poutanen"},{"first_name":"Simonetta","last_name":"Puccetti","full_name":"Puccetti, Simonetta"},{"full_name":"Ramsey, Brian D","last_name":"Ramsey","first_name":"Brian D"},{"full_name":"Rankin, John","last_name":"Rankin","first_name":"John"},{"full_name":"Ratheesh, Ajay","first_name":"Ajay","last_name":"Ratheesh"},{"full_name":"Roberts, Oliver J","last_name":"Roberts","first_name":"Oliver J"},{"full_name":"Romani, Roger W","last_name":"Romani","first_name":"Roger W"},{"last_name":"Sgrò","first_name":"Carmelo","full_name":"Sgrò, Carmelo"},{"first_name":"Patrick","last_name":"Slane","full_name":"Slane, Patrick"},{"full_name":"Soffitta, Paolo","first_name":"Paolo","last_name":"Soffitta"},{"last_name":"Spandre","first_name":"Gloria","full_name":"Spandre, Gloria"},{"full_name":"Swartz, Douglas A","last_name":"Swartz","first_name":"Douglas A"},{"full_name":"Tamagawa, Toru","first_name":"Toru","last_name":"Tamagawa"},{"full_name":"Tavecchio, Fabrizio","last_name":"Tavecchio","first_name":"Fabrizio"},{"full_name":"Tawara, Yuzuru","last_name":"Tawara","first_name":"Yuzuru"},{"last_name":"Tennant","first_name":"Allyn F","full_name":"Tennant, Allyn F"},{"full_name":"Thomas, Nicholas E","first_name":"Nicholas E","last_name":"Thomas"},{"last_name":"Tombesi","first_name":"Francesco","full_name":"Tombesi, Francesco"},{"full_name":"Trois, Alessio","first_name":"Alessio","last_name":"Trois"},{"full_name":"Tsygankov, Sergey S","first_name":"Sergey S","last_name":"Tsygankov"},{"full_name":"Vink, Jacco","last_name":"Vink","first_name":"Jacco"},{"first_name":"Martin C","last_name":"Weisskopf","full_name":"Weisskopf, Martin C"},{"last_name":"Wu","first_name":"Kinwah","full_name":"Wu, Kinwah"},{"last_name":"Xie","first_name":"Fei","full_name":"Xie, Fei"}],"tmp":{"short":"CC BY (4.0)","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"},"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."}],"quality_controlled":"1","publication_identifier":{"eissn":["1365-2966"],"issn":["0035-8711"]},"arxiv":1,"type":"journal_article","main_file_link":[{"url":"https://doi.org/10.1093/mnras/stad3680","open_access":"1"}],"keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"title":"The detection of polarized X-ray emission from the magnetar 1E 2259+586","language":[{"iso":"eng"}],"scopus_import":"1","date_created":"2024-03-26T09:44:24Z","issue":"4","page":"12219-12231","_id":"15190","intvolume":"       527","date_published":"2023-12-01T00:00:00Z","publisher":"Oxford University Press","article_type":"original","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","extern":"1"},{"day":"19","article_processing_charge":"No","volume":956,"oa_version":"Published Version","oa":1,"doi":"10.3847/2041-8213/acffc4","status":"public","publication_status":"published","date_updated":"2024-04-02T06:56:01Z","publication":"The Astrophysical Journal Letters","month":"10","external_id":{"arxiv":["2310.03204"]},"citation":{"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.","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>","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>","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>.","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>.","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.","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)."},"year":"2023","quality_controlled":"1","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."}],"author":[{"last_name":"Miller","first_name":"David R.","full_name":"Miller, David R."},{"orcid":"0000-0002-4770-5388","first_name":"Ilaria","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","last_name":"Caiazzo","full_name":"Caiazzo, Ilaria"},{"last_name":"Heyl","first_name":"Jeremy","full_name":"Heyl, Jeremy"},{"first_name":"Harvey B.","last_name":"Richer","full_name":"Richer, Harvey B."},{"last_name":"El-Badry","first_name":"Kareem","full_name":"El-Badry, Kareem"},{"full_name":"Rodriguez, Antonio C.","first_name":"Antonio C.","last_name":"Rodriguez"},{"first_name":"Zachary P.","last_name":"Vanderbosch","full_name":"Vanderbosch, Zachary P."},{"full_name":"van Roestel, Jan","last_name":"van Roestel","first_name":"Jan"}],"tmp":{"short":"CC BY (4.0)","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"},"title":"An extremely massive white dwarf escaped from the Hyades star cluster","publication_identifier":{"issn":["2041-8205"],"eissn":["2041-8213"]},"arxiv":1,"type":"journal_article","main_file_link":[{"open_access":"1","url":"https://doi.org/10.3847/2041-8213/acffc4"}],"keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"article_number":"L41","_id":"15192","intvolume":"       956","date_published":"2023-10-19T00:00:00Z","language":[{"iso":"eng"}],"scopus_import":"1","issue":"2","date_created":"2024-03-26T09:45:38Z","article_type":"original","publisher":"American Astronomical Society","extern":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87"},{"year":"2023","citation":{"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.","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>","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>","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.","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>.","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).","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>."},"external_id":{"arxiv":["2306.02116"]},"publication":"Astronomy & Astrophysics","month":"09","date_updated":"2024-04-02T06:57:11Z","publication_status":"published","status":"public","doi":"10.1051/0004-6361/202347088","oa":1,"oa_version":"Published Version","volume":677,"day":"04","article_processing_charge":"No","extern":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"EDP Sciences","article_type":"original","date_created":"2024-03-26T09:46:01Z","scopus_import":"1","language":[{"iso":"eng"}],"date_published":"2023-09-04T00:00:00Z","intvolume":"       677","_id":"15193","article_number":"A57","keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"main_file_link":[{"url":"https://doi.org/10.1051/0004-6361/202347088","open_access":"1"}],"type":"journal_article","publication_identifier":{"issn":["0004-6361"],"eissn":["1432-0746"]},"arxiv":1,"title":"Complex variations in X-ray polarization in the X-ray pulsar LS V +44 17/RX J0440.9+4431","tmp":{"short":"CC BY (4.0)","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"},"author":[{"full_name":"Doroshenko, Victor","first_name":"Victor","last_name":"Doroshenko"},{"full_name":"Poutanen, Juri","last_name":"Poutanen","first_name":"Juri"},{"full_name":"Heyl, Jeremy","last_name":"Heyl","first_name":"Jeremy"},{"full_name":"Tsygankov, Sergey S.","first_name":"Sergey S.","last_name":"Tsygankov"},{"full_name":"Caiazzo, Ilaria","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","orcid":"0000-0002-4770-5388","first_name":"Ilaria","last_name":"Caiazzo"},{"first_name":"Roberto","last_name":"Turolla","full_name":"Turolla, Roberto"},{"first_name":"Alexandra","last_name":"Veledina","full_name":"Veledina, Alexandra"},{"full_name":"Weisskopf, Martin C.","first_name":"Martin C.","last_name":"Weisskopf"},{"last_name":"Forsblom","first_name":"Sofia V.","full_name":"Forsblom, Sofia V."},{"first_name":"Denis","last_name":"González-Caniulef","full_name":"González-Caniulef, Denis"},{"first_name":"Vladislav","last_name":"Loktev","full_name":"Loktev, Vladislav"},{"last_name":"Malacaria","first_name":"Christian","full_name":"Malacaria, Christian"},{"last_name":"Mushtukov","first_name":"Alexander A.","full_name":"Mushtukov, Alexander A."},{"full_name":"Suleimanov, Valery F.","last_name":"Suleimanov","first_name":"Valery F."},{"first_name":"Alexander A.","last_name":"Lutovinov","full_name":"Lutovinov, Alexander A."},{"first_name":"Ilya A.","last_name":"Mereminskiy","full_name":"Mereminskiy, Ilya A."},{"first_name":"Sergey V.","last_name":"Molkov","full_name":"Molkov, Sergey V."},{"first_name":"Alexander","last_name":"Salganik","full_name":"Salganik, Alexander"},{"full_name":"Santangelo, Andrea","last_name":"Santangelo","first_name":"Andrea"},{"first_name":"Andrei V.","last_name":"Berdyugin","full_name":"Berdyugin, Andrei V."},{"full_name":"Kravtsov, Vadim","last_name":"Kravtsov","first_name":"Vadim"},{"last_name":"Nitindala","first_name":"Anagha P.","full_name":"Nitindala, Anagha P."},{"first_name":"Iván","last_name":"Agudo","full_name":"Agudo, Iván"},{"full_name":"Antonelli, Lucio A.","first_name":"Lucio A.","last_name":"Antonelli"},{"full_name":"Bachetti, Matteo","last_name":"Bachetti","first_name":"Matteo"},{"full_name":"Baldini, Luca","first_name":"Luca","last_name":"Baldini"},{"full_name":"Baumgartner, Wayne H.","last_name":"Baumgartner","first_name":"Wayne H."},{"full_name":"Bellazzini, Ronaldo","last_name":"Bellazzini","first_name":"Ronaldo"},{"full_name":"Bianchi, Stefano","first_name":"Stefano","last_name":"Bianchi"},{"full_name":"Bongiorno, Stephen D.","first_name":"Stephen D.","last_name":"Bongiorno"},{"full_name":"Bonino, Raffaella","last_name":"Bonino","first_name":"Raffaella"},{"full_name":"Brez, Alessandro","last_name":"Brez","first_name":"Alessandro"},{"last_name":"Bucciantini","first_name":"Niccolò","full_name":"Bucciantini, Niccolò"},{"last_name":"Capitanio","first_name":"Fiamma","full_name":"Capitanio, Fiamma"},{"full_name":"Castellano, Simone","first_name":"Simone","last_name":"Castellano"},{"full_name":"Cavazzuti, Elisabetta","first_name":"Elisabetta","last_name":"Cavazzuti"},{"first_name":"Chien-Ting","last_name":"Chen","full_name":"Chen, Chien-Ting"},{"last_name":"Ciprini","first_name":"Stefano","full_name":"Ciprini, Stefano"},{"last_name":"Costa","first_name":"Enrico","full_name":"Costa, Enrico"},{"full_name":"De Rosa, Alessandra","first_name":"Alessandra","last_name":"De Rosa"},{"first_name":"Ettore","last_name":"Del Monte","full_name":"Del Monte, Ettore"},{"full_name":"Di Gesu, Laura","last_name":"Di Gesu","first_name":"Laura"},{"full_name":"Di Lalla, Niccolò","first_name":"Niccolò","last_name":"Di Lalla"},{"full_name":"Di Marco, Alessandro","first_name":"Alessandro","last_name":"Di Marco"},{"first_name":"Immacolata","last_name":"Donnarumma","full_name":"Donnarumma, Immacolata"},{"last_name":"Dovčiak","first_name":"Michal","full_name":"Dovčiak, Michal"},{"full_name":"Ehlert, Steven R.","last_name":"Ehlert","first_name":"Steven R."},{"full_name":"Enoto, Teruaki","last_name":"Enoto","first_name":"Teruaki"},{"first_name":"Yuri","last_name":"Evangelista","full_name":"Evangelista, Yuri"},{"full_name":"Fabiani, Sergio","first_name":"Sergio","last_name":"Fabiani"},{"full_name":"Ferrazzoli, Riccardo","last_name":"Ferrazzoli","first_name":"Riccardo"},{"first_name":"Javier A.","last_name":"García","full_name":"García, Javier A."},{"full_name":"Gunji, Shuichi","last_name":"Gunji","first_name":"Shuichi"},{"first_name":"Kiyoshi","last_name":"Hayashida","full_name":"Hayashida, Kiyoshi"},{"last_name":"Iwakiri","first_name":"Wataru","full_name":"Iwakiri, Wataru"},{"first_name":"Svetlana G.","last_name":"Jorstad","full_name":"Jorstad, Svetlana G."},{"full_name":"Kaaret, Philip","first_name":"Philip","last_name":"Kaaret"},{"full_name":"Karas, Vladimir","first_name":"Vladimir","last_name":"Karas"},{"first_name":"Fabian","last_name":"Kislat","full_name":"Kislat, Fabian"},{"full_name":"Kitaguchi, Takao","first_name":"Takao","last_name":"Kitaguchi"},{"full_name":"Kolodziejczak, Jeffery J.","last_name":"Kolodziejczak","first_name":"Jeffery J."},{"last_name":"Krawczynski","first_name":"Henric","full_name":"Krawczynski, Henric"},{"full_name":"La Monaca, Fabio","first_name":"Fabio","last_name":"La Monaca"},{"full_name":"Latronico, Luca","first_name":"Luca","last_name":"Latronico"},{"last_name":"Liodakis","first_name":"Ioannis","full_name":"Liodakis, Ioannis"},{"full_name":"Maldera, Simone","last_name":"Maldera","first_name":"Simone"},{"full_name":"Manfreda, Alberto","first_name":"Alberto","last_name":"Manfreda"},{"full_name":"Marin, Frédéric","first_name":"Frédéric","last_name":"Marin"},{"full_name":"Marinucci, Andrea","first_name":"Andrea","last_name":"Marinucci"},{"first_name":"Alan P.","last_name":"Marscher","full_name":"Marscher, Alan P."},{"full_name":"Marshall, Herman L.","last_name":"Marshall","first_name":"Herman L."},{"last_name":"Massaro","first_name":"Francesco","full_name":"Massaro, Francesco"},{"full_name":"Matt, Giorgio","last_name":"Matt","first_name":"Giorgio"},{"last_name":"Mitsuishi","first_name":"Ikuyuki","full_name":"Mitsuishi, Ikuyuki"},{"full_name":"Mizuno, Tsunefumi","first_name":"Tsunefumi","last_name":"Mizuno"},{"full_name":"Muleri, Fabio","first_name":"Fabio","last_name":"Muleri"},{"full_name":"Negro, Michela","last_name":"Negro","first_name":"Michela"},{"last_name":"Ng","first_name":"Chi-Yung","full_name":"Ng, Chi-Yung"},{"last_name":"O’Dell","first_name":"Stephen L.","full_name":"O’Dell, Stephen L."},{"full_name":"Omodei, Nicola","first_name":"Nicola","last_name":"Omodei"},{"full_name":"Oppedisano, Chiara","first_name":"Chiara","last_name":"Oppedisano"},{"last_name":"Papitto","first_name":"Alessandro","full_name":"Papitto, Alessandro"},{"full_name":"Pavlov, George G.","last_name":"Pavlov","first_name":"George G."},{"full_name":"Peirson, Abel L.","last_name":"Peirson","first_name":"Abel L."},{"full_name":"Perri, Matteo","last_name":"Perri","first_name":"Matteo"},{"first_name":"Melissa","last_name":"Pesce-Rollins","full_name":"Pesce-Rollins, Melissa"},{"full_name":"Petrucci, Pierre-Olivier","first_name":"Pierre-Olivier","last_name":"Petrucci"},{"first_name":"Maura","last_name":"Pilia","full_name":"Pilia, Maura"},{"full_name":"Possenti, Andrea","last_name":"Possenti","first_name":"Andrea"},{"last_name":"Puccetti","first_name":"Simonetta","full_name":"Puccetti, Simonetta"},{"full_name":"Ramsey, Brian D.","last_name":"Ramsey","first_name":"Brian D."},{"full_name":"Rankin, John","first_name":"John","last_name":"Rankin"},{"last_name":"Ratheesh","first_name":"Ajay","full_name":"Ratheesh, 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."},{"full_name":"Sgrò, Carmelo","last_name":"Sgrò","first_name":"Carmelo"},{"full_name":"Slane, Patrick","last_name":"Slane","first_name":"Patrick"},{"last_name":"Soffitta","first_name":"Paolo","full_name":"Soffitta, Paolo"},{"full_name":"Spandre, Gloria","first_name":"Gloria","last_name":"Spandre"},{"first_name":"Douglas A.","last_name":"Swartz","full_name":"Swartz, Douglas A."},{"last_name":"Tamagawa","first_name":"Toru","full_name":"Tamagawa, Toru"},{"full_name":"Tavecchio, Fabrizio","first_name":"Fabrizio","last_name":"Tavecchio"},{"full_name":"Taverna, Roberto","first_name":"Roberto","last_name":"Taverna"},{"full_name":"Tawara, Yuzuru","last_name":"Tawara","first_name":"Yuzuru"},{"last_name":"Tennant","first_name":"Allyn F.","full_name":"Tennant, Allyn F."},{"full_name":"Thomas, Nicholas E.","first_name":"Nicholas E.","last_name":"Thomas"},{"first_name":"Francesco","last_name":"Tombesi","full_name":"Tombesi, Francesco"},{"first_name":"Alessio","last_name":"Trois","full_name":"Trois, Alessio"},{"full_name":"Vink, Jacco","last_name":"Vink","first_name":"Jacco"},{"full_name":"Wu, Kinwah","last_name":"Wu","first_name":"Kinwah"},{"full_name":"Xie, Fei","last_name":"Xie","first_name":"Fei"},{"full_name":"Zane, Silvia","first_name":"Silvia","last_name":"Zane"}],"abstract":[{"lang":"eng","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."}],"quality_controlled":"1"},{"publication_identifier":{"issn":["0004-637X"],"eissn":["1538-4357"]},"type":"journal_article","main_file_link":[{"url":"https://doi.org/10.3847/1538-4357/ace698","open_access":"1"}],"keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"title":"SRGeJ045359.9+622444: A 55 minute period eclipsing AM Canum Venaticorum star discovered from a joint SRG/eROSITA + ZTF search","author":[{"first_name":"Antonio C.","last_name":"Rodriguez","full_name":"Rodriguez, Antonio C."},{"first_name":"Ilkham","last_name":"Galiullin","full_name":"Galiullin, Ilkham"},{"full_name":"Gilfanov, Marat","last_name":"Gilfanov","first_name":"Marat"},{"last_name":"Kulkarni","first_name":"Shrinivas R.","full_name":"Kulkarni, Shrinivas R."},{"full_name":"Khamitov, Irek","first_name":"Irek","last_name":"Khamitov"},{"full_name":"Bikmaev, Ilfan","first_name":"Ilfan","last_name":"Bikmaev"},{"last_name":"van Roestel","first_name":"Jan","full_name":"van Roestel, Jan"},{"first_name":"Lev","last_name":"Yungelson","full_name":"Yungelson, Lev"},{"full_name":"El-Badry, Kareem","last_name":"El-Badry","first_name":"Kareem"},{"last_name":"Sunayev","first_name":"Rashid","full_name":"Sunayev, Rashid"},{"full_name":"Prince, Thomas A.","first_name":"Thomas A.","last_name":"Prince"},{"last_name":"Buntov","first_name":"Mikhail","full_name":"Buntov, Mikhail"},{"full_name":"Caiazzo, Ilaria","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","orcid":"0000-0002-4770-5388","first_name":"Ilaria","last_name":"Caiazzo"},{"full_name":"Drake, Andrew","first_name":"Andrew","last_name":"Drake"},{"last_name":"Gorbachev","first_name":"Mark","full_name":"Gorbachev, Mark"},{"last_name":"Graham","first_name":"Matthew J.","full_name":"Graham, Matthew J."},{"last_name":"Gumerov","first_name":"Rustam","full_name":"Gumerov, Rustam"},{"full_name":"Irtuganov, Eldar","last_name":"Irtuganov","first_name":"Eldar"},{"full_name":"Laher, Russ R.","first_name":"Russ R.","last_name":"Laher"},{"last_name":"Masci","first_name":"Frank J.","full_name":"Masci, Frank J."},{"full_name":"Medvedev, Pavel","last_name":"Medvedev","first_name":"Pavel"},{"first_name":"Josiah","last_name":"Purdum","full_name":"Purdum, Josiah"},{"full_name":"Sakhibullin, Nail","first_name":"Nail","last_name":"Sakhibullin"},{"first_name":"Alexander","last_name":"Sklyanov","full_name":"Sklyanov, Alexander"},{"last_name":"Smith","first_name":"Roger","full_name":"Smith, Roger"},{"last_name":"Szkody","first_name":"Paula","full_name":"Szkody, Paula"},{"full_name":"Vanderbosch, Zachary P.","last_name":"Vanderbosch","first_name":"Zachary P."}],"tmp":{"short":"CC BY (4.0)","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"},"quality_controlled":"1","abstract":[{"lang":"eng","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."}],"publisher":"American Astronomical Society","article_type":"original","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","extern":"1","language":[{"iso":"eng"}],"scopus_import":"1","issue":"1","date_created":"2024-03-26T09:46:30Z","article_number":"63","_id":"15194","intvolume":"       954","date_published":"2023-08-23T00:00:00Z","date_updated":"2024-04-02T06:58:03Z","doi":"10.3847/1538-4357/ace698","status":"public","publication_status":"published","oa_version":"Published Version","oa":1,"article_processing_charge":"No","day":"23","volume":954,"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>","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>.","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>.","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).","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."},"year":"2023","publication":"The Astrophysical Journal","month":"08"},{"month":"07","publication":"Nature","citation":{"ieee":"I. Caiazzo <i>et al.</i>, “A rotating white dwarf shows different compositions on its opposite faces,” <i>Nature</i>, vol. 620, no. 7972. Springer Nature, pp. 61–66, 2023.","chicago":"Caiazzo, Ilaria, Kevin B. Burdge, Pier-Emmanuel Tremblay, James Fuller, Lilia Ferrario, Boris T. Gänsicke, J. J. Hermes, et al. “A Rotating White Dwarf Shows Different Compositions on Its Opposite Faces.” <i>Nature</i>. Springer Nature, 2023. <a href=\"https://doi.org/10.1038/s41586-023-06171-9\">https://doi.org/10.1038/s41586-023-06171-9</a>.","mla":"Caiazzo, Ilaria, et al. “A Rotating White Dwarf Shows Different Compositions on Its Opposite Faces.” <i>Nature</i>, vol. 620, no. 7972, Springer Nature, 2023, pp. 61–66, doi:<a href=\"https://doi.org/10.1038/s41586-023-06171-9\">10.1038/s41586-023-06171-9</a>.","ista":"Caiazzo I, Burdge KB, Tremblay P-E, Fuller J, Ferrario L, Gänsicke BT, Hermes JJ, Heyl J, Kawka A, Kulkarni SR, Marsh TR, Mróz P, Prince TA, Richer HB, Rodriguez AC, van Roestel J, Vanderbosch ZP, Vennes S, Wickramasinghe D, Dhillon VS, Littlefair SP, Munday J, Pelisoli I, Perley D, Bellm EC, Breedt E, Brown AJ, Dekany R, Drake A, Dyer MJ, Graham MJ, Green MJ, Laher RR, Kerry P, Parsons SG, Riddle RL, Rusholme B, Sahman DI. 2023. A rotating white dwarf shows different compositions on its opposite faces. Nature. 620(7972), 61–66.","short":"I. Caiazzo, K.B. Burdge, P.-E. Tremblay, J. Fuller, L. Ferrario, B.T. Gänsicke, J.J. Hermes, J. Heyl, A. Kawka, S.R. Kulkarni, T.R. Marsh, P. Mróz, T.A. Prince, H.B. Richer, A.C. Rodriguez, J. van Roestel, Z.P. Vanderbosch, S. Vennes, D. Wickramasinghe, V.S. Dhillon, S.P. Littlefair, J. Munday, I. Pelisoli, D. Perley, E.C. Bellm, E. Breedt, A.J. Brown, R. Dekany, A. Drake, M.J. Dyer, M.J. Graham, M.J. Green, R.R. Laher, P. Kerry, S.G. Parsons, R.L. Riddle, B. Rusholme, D.I. Sahman, Nature 620 (2023) 61–66.","ama":"Caiazzo I, Burdge KB, Tremblay P-E, et al. A rotating white dwarf shows different compositions on its opposite faces. <i>Nature</i>. 2023;620(7972):61-66. doi:<a href=\"https://doi.org/10.1038/s41586-023-06171-9\">10.1038/s41586-023-06171-9</a>","apa":"Caiazzo, I., Burdge, K. B., Tremblay, P.-E., Fuller, J., Ferrario, L., Gänsicke, B. T., … Sahman, D. I. (2023). A rotating white dwarf shows different compositions on its opposite faces. <i>Nature</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41586-023-06171-9\">https://doi.org/10.1038/s41586-023-06171-9</a>"},"year":"2023","external_id":{"arxiv":["2308.07430"]},"oa":1,"oa_version":"Preprint","volume":620,"day":"19","article_processing_charge":"No","date_updated":"2024-10-14T12:32:28Z","publication_status":"published","status":"public","doi":"10.1038/s41586-023-06171-9","issue":"7972","date_created":"2024-03-26T09:46:57Z","scopus_import":"1","language":[{"iso":"eng"}],"date_published":"2023-07-19T00:00:00Z","_id":"15195","intvolume":"       620","page":"61-66","extern":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Springer Nature","article_type":"original","author":[{"last_name":"Caiazzo","orcid":"0000-0002-4770-5388","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","first_name":"Ilaria","full_name":"Caiazzo, Ilaria"},{"last_name":"Burdge","first_name":"Kevin B.","full_name":"Burdge, Kevin B."},{"full_name":"Tremblay, Pier-Emmanuel","last_name":"Tremblay","first_name":"Pier-Emmanuel"},{"first_name":"James","last_name":"Fuller","full_name":"Fuller, James"},{"first_name":"Lilia","last_name":"Ferrario","full_name":"Ferrario, Lilia"},{"last_name":"Gänsicke","first_name":"Boris T.","full_name":"Gänsicke, Boris T."},{"full_name":"Hermes, J. J.","first_name":"J. J.","last_name":"Hermes"},{"full_name":"Heyl, Jeremy","last_name":"Heyl","first_name":"Jeremy"},{"first_name":"Adela","last_name":"Kawka","full_name":"Kawka, Adela"},{"first_name":"S. R.","last_name":"Kulkarni","full_name":"Kulkarni, S. R."},{"last_name":"Marsh","first_name":"Thomas R.","full_name":"Marsh, Thomas R."},{"first_name":"Przemek","last_name":"Mróz","full_name":"Mróz, Przemek"},{"last_name":"Prince","first_name":"Thomas A.","full_name":"Prince, Thomas A."},{"full_name":"Richer, Harvey B.","last_name":"Richer","first_name":"Harvey B."},{"first_name":"Antonio C.","last_name":"Rodriguez","full_name":"Rodriguez, Antonio C."},{"full_name":"van Roestel, Jan","first_name":"Jan","last_name":"van Roestel"},{"last_name":"Vanderbosch","first_name":"Zachary P.","full_name":"Vanderbosch, Zachary P."},{"first_name":"Stéphane","last_name":"Vennes","full_name":"Vennes, Stéphane"},{"full_name":"Wickramasinghe, Dayal","last_name":"Wickramasinghe","first_name":"Dayal"},{"full_name":"Dhillon, Vikram S.","first_name":"Vikram S.","last_name":"Dhillon"},{"full_name":"Littlefair, Stuart P.","last_name":"Littlefair","first_name":"Stuart P."},{"full_name":"Munday, James","first_name":"James","last_name":"Munday"},{"full_name":"Pelisoli, Ingrid","last_name":"Pelisoli","first_name":"Ingrid"},{"full_name":"Perley, Daniel","first_name":"Daniel","last_name":"Perley"},{"full_name":"Bellm, Eric C.","first_name":"Eric C.","last_name":"Bellm"},{"full_name":"Breedt, Elmé","last_name":"Breedt","first_name":"Elmé"},{"full_name":"Brown, Alex J.","last_name":"Brown","first_name":"Alex J."},{"full_name":"Dekany, Richard","first_name":"Richard","last_name":"Dekany"},{"full_name":"Drake, Andrew","first_name":"Andrew","last_name":"Drake"},{"last_name":"Dyer","first_name":"Martin J.","full_name":"Dyer, Martin J."},{"first_name":"Matthew J.","last_name":"Graham","full_name":"Graham, Matthew J."},{"full_name":"Green, Matthew J.","first_name":"Matthew J.","last_name":"Green"},{"full_name":"Laher, Russ R.","last_name":"Laher","first_name":"Russ R."},{"full_name":"Kerry, Paul","first_name":"Paul","last_name":"Kerry"},{"full_name":"Parsons, Steven G.","last_name":"Parsons","first_name":"Steven G."},{"full_name":"Riddle, Reed L.","first_name":"Reed L.","last_name":"Riddle"},{"full_name":"Rusholme, Ben","last_name":"Rusholme","first_name":"Ben"},{"full_name":"Sahman, Dave I.","last_name":"Sahman","first_name":"Dave I."}],"quality_controlled":"1","abstract":[{"lang":"eng","text":"White dwarfs, the extremely dense remnants left behind by most stars after their death, are characterized by a mass comparable to that of the Sun compressed into the size of an Earth-like planet. In the resulting strong gravity, heavy elements sink towards the centre and the upper layer of the atmosphere contains only the lightest element present, usually hydrogen or helium1,2. Several mechanisms compete with gravitational settling to change a white dwarf’s surface composition as it cools3, and the fraction of white dwarfs with helium atmospheres is known to increase by a factor of about 2.5 below a temperature of about 30,000 kelvin4,5,6,7,8; therefore, some white dwarfs that appear to have hydrogen-dominated atmospheres above 30,000 kelvin are bound to transition to be helium-dominated as they cool below it. Here we report observations of ZTF J203349.8+322901.1, a transitioning white dwarf with two faces: one side of its atmosphere is dominated by hydrogen and the other one by helium. This peculiar nature is probably caused by the presence of a small magnetic field, which creates an inhomogeneity in temperature, pressure or mixing strength over the surface9,10,11. ZTF J203349.8+322901.1 might be the most extreme member of a class of magnetic, transitioning white dwarfs—together with GD 323 (ref. 12), a white dwarf that shows similar but much more subtle variations. This class of white dwarfs could help shed light on the physical mechanisms behind the spectral evolution of white dwarfs."}],"main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2308.07430"}],"type":"journal_article","publication_identifier":{"issn":["0028-0836"],"eissn":["1476-4687"]},"arxiv":1,"title":"A rotating white dwarf shows different compositions on its opposite faces"},{"publication":"The Astrophysical Journal Letters","month":"08","citation":{"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>","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>","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.","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>.","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)."},"year":"2023","external_id":{"arxiv":["2303.13573"]},"oa_version":"Published Version","oa":1,"volume":953,"day":"08","article_processing_charge":"No","date_updated":"2024-04-02T07:01:46Z","publication_status":"published","status":"public","doi":"10.3847/2041-8213/ace7cf","language":[{"iso":"eng"}],"issue":"1","date_created":"2024-03-26T09:47:22Z","scopus_import":"1","intvolume":"       953","_id":"15196","article_number":"L1","date_published":"2023-08-08T00:00:00Z","article_type":"original","publisher":"American Astronomical Society","extern":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"full_name":"Burdge, Kevin B.","last_name":"Burdge","first_name":"Kevin B."},{"first_name":"Kareem","last_name":"El-Badry","full_name":"El-Badry, Kareem"},{"last_name":"Rappaport","first_name":"Saul","full_name":"Rappaport, Saul"},{"full_name":"Sunny Wong, Tin Long","first_name":"Tin Long","last_name":"Sunny Wong"},{"last_name":"Bauer","first_name":"Evan B.","full_name":"Bauer, Evan B."},{"full_name":"Bildsten, Lars","last_name":"Bildsten","first_name":"Lars"},{"full_name":"Caiazzo, Ilaria","last_name":"Caiazzo","orcid":"0000-0002-4770-5388","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","first_name":"Ilaria"},{"first_name":"Deepto","last_name":"Chakrabarty","full_name":"Chakrabarty, Deepto"},{"first_name":"Emma","last_name":"Chickles","full_name":"Chickles, Emma"},{"full_name":"Graham, Matthew J.","last_name":"Graham","first_name":"Matthew J."},{"full_name":"Kara, Erin","first_name":"Erin","last_name":"Kara"},{"full_name":"Kulkarni, S. R.","last_name":"Kulkarni","first_name":"S. R."},{"full_name":"Marsh, Thomas R.","first_name":"Thomas R.","last_name":"Marsh"},{"full_name":"Nynka, Melania","last_name":"Nynka","first_name":"Melania"},{"full_name":"Prince, Thomas A.","first_name":"Thomas A.","last_name":"Prince"},{"full_name":"Simcoe, Robert A.","last_name":"Simcoe","first_name":"Robert A."},{"full_name":"van Roestel, Jan","last_name":"van Roestel","first_name":"Jan"},{"full_name":"Vanderbosch, Zach","first_name":"Zach","last_name":"Vanderbosch"},{"first_name":"Eric C.","last_name":"Bellm","full_name":"Bellm, Eric C."},{"last_name":"Dekany","first_name":"Richard G.","full_name":"Dekany, Richard G."},{"full_name":"Drake, Andrew J.","last_name":"Drake","first_name":"Andrew J."},{"last_name":"Helou","first_name":"George","full_name":"Helou, George"},{"full_name":"Masci, Frank J.","first_name":"Frank J.","last_name":"Masci"},{"full_name":"Milburn, Jennifer","last_name":"Milburn","first_name":"Jennifer"},{"first_name":"Reed","last_name":"Riddle","full_name":"Riddle, Reed"},{"last_name":"Rusholme","first_name":"Ben","full_name":"Rusholme, Ben"},{"first_name":"Roger","last_name":"Smith","full_name":"Smith, Roger"}],"tmp":{"short":"CC BY (4.0)","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"},"quality_controlled":"1","abstract":[{"lang":"eng","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."}],"type":"journal_article","arxiv":1,"publication_identifier":{"issn":["2041-8205"],"eissn":["2041-8213"]},"keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"main_file_link":[{"open_access":"1","url":"https://doi.org/10.3847/2041-8213/ace7cf"}],"title":"Orbital decay in an accreting and eclipsing 13.7 minute orbital period binary with a luminous donor"},{"title":"Keck and Gemini spectral characterization of Lucy mission fly-by target (152830) Dinkinesh","main_file_link":[{"url":"https://arxiv.org/abs/2303.08130","open_access":"1"}],"keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"arxiv":1,"publication_identifier":{"issn":["0019-1035"]},"type":"journal_article","abstract":[{"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.","lang":"eng"}],"quality_controlled":"1","author":[{"first_name":"B.T.","last_name":"Bolin","full_name":"Bolin, B.T."},{"last_name":"Noll","first_name":"K.S.","full_name":"Noll, K.S."},{"full_name":"Caiazzo, Ilaria","orcid":"0000-0002-4770-5388","first_name":"Ilaria","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","last_name":"Caiazzo"},{"last_name":"Fremling","first_name":"C.","full_name":"Fremling, C."},{"first_name":"R.P.","last_name":"Binzel","full_name":"Binzel, R.P."}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","extern":"1","publisher":"Elsevier","article_type":"original","date_published":"2023-04-07T00:00:00Z","article_number":"115562","intvolume":"       400","_id":"15197","scopus_import":"1","date_created":"2024-03-26T09:47:44Z","language":[{"iso":"eng"}],"doi":"10.1016/j.icarus.2023.115562","status":"public","publication_status":"published","date_updated":"2024-04-02T07:02:28Z","article_processing_charge":"No","day":"07","volume":400,"oa":1,"oa_version":"Preprint","external_id":{"arxiv":["2303.08130"]},"citation":{"short":"B.T. Bolin, K.S. Noll, I. Caiazzo, C. Fremling, R.P. Binzel, Icarus 400 (2023).","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>.","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.","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>.","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>","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."},"year":"2023","publication":"Icarus","month":"04"},{"date_created":"2024-03-26T09:48:05Z","issue":"10","scopus_import":"1","language":[{"iso":"eng"}],"date_published":"2023-05-17T00:00:00Z","intvolume":"       107","_id":"15198","article_number":"L101303","extern":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_type":"original","publisher":"American Physical Society","author":[{"first_name":"Leesa","last_name":"Fleury","full_name":"Fleury, Leesa"},{"full_name":"Caiazzo, Ilaria","last_name":"Caiazzo","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","first_name":"Ilaria","orcid":"0000-0002-4770-5388"},{"first_name":"Jeremy","last_name":"Heyl","full_name":"Heyl, Jeremy"}],"quality_controlled":"1","abstract":[{"text":"The axion-nucleon coupling enables the production of axions through the decay of excited 57Fe nuclei, and axions produced in the Sun through this process are often a target of helioscope searches. We show for the first time that hot, highly magnetic white dwarfs such as ZTF J1901+1458 are a viable target to search for the x-ray signature of axions that were produced by the 57Fe transition in the core and then converted to photons in the magnetosphere. We calculate that a 100 ks observation of ZTF J1901+1458 with NuSTAR would constrain the coupling of axions to nucleons and photons at a level below the bounds of both current and future planned helioscopes.","lang":"eng"}],"main_file_link":[{"url":"https://arxiv.org/abs/2208.00405","open_access":"1"}],"type":"journal_article","arxiv":1,"publication_identifier":{"eissn":["2470-0029"],"issn":["2470-0010"]},"title":"Constraining axions with ZTF J1901+1458","month":"05","publication":"Physical Review D","citation":{"short":"L. Fleury, I. Caiazzo, J. Heyl, Physical Review D 107 (2023).","mla":"Fleury, Leesa, et al. “Constraining Axions with ZTF J1901+1458.” <i>Physical Review D</i>, vol. 107, no. 10, L101303, American Physical Society, 2023, doi:<a href=\"https://doi.org/10.1103/physrevd.107.l101303\">10.1103/physrevd.107.l101303</a>.","ista":"Fleury L, Caiazzo I, Heyl J. 2023. Constraining axions with ZTF J1901+1458. Physical Review D. 107(10), L101303.","chicago":"Fleury, Leesa, Ilaria Caiazzo, and Jeremy Heyl. “Constraining Axions with ZTF J1901+1458.” <i>Physical Review D</i>. American Physical Society, 2023. <a href=\"https://doi.org/10.1103/physrevd.107.l101303\">https://doi.org/10.1103/physrevd.107.l101303</a>.","ama":"Fleury L, Caiazzo I, Heyl J. Constraining axions with ZTF J1901+1458. <i>Physical Review D</i>. 2023;107(10). doi:<a href=\"https://doi.org/10.1103/physrevd.107.l101303\">10.1103/physrevd.107.l101303</a>","apa":"Fleury, L., Caiazzo, I., &#38; Heyl, J. (2023). Constraining axions with ZTF J1901+1458. <i>Physical Review D</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevd.107.l101303\">https://doi.org/10.1103/physrevd.107.l101303</a>","ieee":"L. Fleury, I. Caiazzo, and J. Heyl, “Constraining axions with ZTF J1901+1458,” <i>Physical Review D</i>, vol. 107, no. 10. American Physical Society, 2023."},"year":"2023","external_id":{"arxiv":["2208.00405"]},"oa":1,"oa_version":"Preprint","volume":107,"day":"17","article_processing_charge":"No","date_updated":"2024-04-02T07:11:34Z","status":"public","publication_status":"published","doi":"10.1103/physrevd.107.l101303"},{"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."}],"quality_controlled":"1","author":[{"last_name":"Fleury","first_name":"Leesa","full_name":"Fleury, Leesa"},{"full_name":"Caiazzo, Ilaria","last_name":"Caiazzo","orcid":"0000-0002-4770-5388","first_name":"Ilaria","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d"},{"last_name":"Heyl","first_name":"Jeremy","full_name":"Heyl, Jeremy"}],"title":"The origin of ultramassive white dwarfs: hints from <i>Gaia</i> EDR3","keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2205.01015"}],"type":"journal_article","publication_identifier":{"eissn":["1365-2966"],"issn":["0035-8711"]},"arxiv":1,"date_published":"2023-01-12T00:00:00Z","_id":"15199","intvolume":"       520","page":"364-374","issue":"1","date_created":"2024-03-26T09:48:27Z","scopus_import":"1","language":[{"iso":"eng"}],"extern":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_type":"original","publisher":"Oxford University Press","volume":520,"day":"12","article_processing_charge":"No","oa":1,"oa_version":"Preprint","status":"public","publication_status":"published","doi":"10.1093/mnras/stad068","date_updated":"2024-04-02T07:13:10Z","publication":"Monthly Notices of the Royal Astronomical Society","month":"01","year":"2023","citation":{"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>.","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.","short":"L. Fleury, I. Caiazzo, J. Heyl, Monthly Notices of the Royal Astronomical Society 520 (2023) 364–374.","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>","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."},"external_id":{"arxiv":["2205.01015"]}},{"publication":"The Astrophysical Journal","month":"03","citation":{"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>","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>","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).","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>.","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>.","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."},"year":"2023","external_id":{"arxiv":["2206.04714"]},"oa":1,"oa_version":"Published Version","volume":945,"day":"15","article_processing_charge":"No","date_updated":"2024-04-02T07:13:55Z","status":"public","publication_status":"published","doi":"10.3847/1538-4357/acbb6f","issue":"2","date_created":"2024-03-26T09:48:51Z","scopus_import":"1","language":[{"iso":"eng"}],"date_published":"2023-03-15T00:00:00Z","_id":"15200","intvolume":"       945","article_number":"141","extern":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"American Astronomical Society","article_type":"original","tmp":{"short":"CC BY (4.0)","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"},"author":[{"full_name":"Rodriguez, Antonio C.","first_name":"Antonio C.","last_name":"Rodriguez"},{"last_name":"Kulkarni","first_name":"Shrinivas R.","full_name":"Kulkarni, Shrinivas R."},{"full_name":"Prince, Thomas A.","last_name":"Prince","first_name":"Thomas A."},{"full_name":"Szkody, Paula","last_name":"Szkody","first_name":"Paula"},{"last_name":"Burdge","first_name":"Kevin B.","full_name":"Burdge, Kevin B."},{"full_name":"Caiazzo, Ilaria","last_name":"Caiazzo","orcid":"0000-0002-4770-5388","first_name":"Ilaria","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d"},{"first_name":"Jan","last_name":"van Roestel","full_name":"van Roestel, Jan"},{"full_name":"Vanderbosch, Zachary P.","first_name":"Zachary P.","last_name":"Vanderbosch"},{"full_name":"El-Badry, Kareem","first_name":"Kareem","last_name":"El-Badry"},{"full_name":"Bellm, Eric C.","first_name":"Eric C.","last_name":"Bellm"},{"full_name":"Gänsicke, Boris T.","last_name":"Gänsicke","first_name":"Boris T."},{"full_name":"Graham, Matthew J.","first_name":"Matthew J.","last_name":"Graham"},{"full_name":"Mahabal, Ashish A.","last_name":"Mahabal","first_name":"Ashish A."},{"full_name":"Masci, Frank J.","first_name":"Frank J.","last_name":"Masci"},{"last_name":"Mróz","first_name":"Przemek","full_name":"Mróz, Przemek"},{"last_name":"Riddle","first_name":"Reed","full_name":"Riddle, Reed"},{"last_name":"Rusholme","first_name":"Ben","full_name":"Rusholme, Ben"}],"quality_controlled":"1","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"],"main_file_link":[{"url":"https://doi.org/10.3847/1538-4357/acbb6f","open_access":"1"}],"type":"journal_article","publication_identifier":{"eissn":["1538-4357"],"issn":["0004-637X"]},"arxiv":1,"title":"Discovery of two polars from a crossmatch of ZTF and the SRG/eFEDS x-ray catalog"},{"keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"main_file_link":[{"url":"https://arxiv.org/abs/2204.00140","open_access":"1"}],"type":"journal_article","publication_identifier":{"eissn":["1365-2966"],"issn":["0035-8711"]},"arxiv":1,"title":"Unbinned likelihood analysis for X-ray polarization","author":[{"full_name":"González-Caniulef, Denis","first_name":"Denis","last_name":"González-Caniulef"},{"first_name":"Ilaria","orcid":"0000-0002-4770-5388","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","last_name":"Caiazzo","full_name":"Caiazzo, Ilaria"},{"first_name":"Jeremy","last_name":"Heyl","full_name":"Heyl, Jeremy"}],"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."}],"quality_controlled":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","extern":"1","article_type":"original","publisher":"Oxford University Press","issue":"4","date_created":"2024-03-26T09:49:52Z","scopus_import":"1","language":[{"iso":"eng"}],"date_published":"2023-01-16T00:00:00Z","intvolume":"       519","_id":"15201","page":"5902-5912","date_updated":"2024-04-02T07:14:49Z","status":"public","publication_status":"published","doi":"10.1093/mnras/stad033","oa":1,"oa_version":"Preprint","volume":519,"day":"16","article_processing_charge":"No","citation":{"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>.","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.","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>.","short":"D. González-Caniulef, I. Caiazzo, J. Heyl, Monthly Notices of the Royal Astronomical Society 519 (2023) 5902–5912.","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>","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."},"year":"2023","external_id":{"arxiv":["2204.00140"]},"publication":"Monthly Notices of the Royal Astronomical Society","month":"01"},{"author":[{"last_name":"Zane","first_name":"Silvia","full_name":"Zane, Silvia"},{"full_name":"Taverna, Roberto","first_name":"Roberto","last_name":"Taverna"},{"full_name":"González–Caniulef, Denis","last_name":"González–Caniulef","first_name":"Denis"},{"last_name":"Muleri","first_name":"Fabio","full_name":"Muleri, Fabio"},{"full_name":"Turolla, Roberto","last_name":"Turolla","first_name":"Roberto"},{"full_name":"Heyl, Jeremy","first_name":"Jeremy","last_name":"Heyl"},{"full_name":"Uchiyama, Keisuke","first_name":"Keisuke","last_name":"Uchiyama"},{"first_name":"Mason","last_name":"Ng","full_name":"Ng, Mason"},{"first_name":"Toru","last_name":"Tamagawa","full_name":"Tamagawa, Toru"},{"full_name":"Caiazzo, Ilaria","last_name":"Caiazzo","first_name":"Ilaria","orcid":"0000-0002-4770-5388","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d"},{"full_name":"Di Lalla, Niccolò","first_name":"Niccolò","last_name":"Di Lalla"},{"first_name":"Herman L.","last_name":"Marshall","full_name":"Marshall, Herman L."},{"full_name":"Bachetti, Matteo","last_name":"Bachetti","first_name":"Matteo"},{"full_name":"La Monaca, Fabio","last_name":"La Monaca","first_name":"Fabio"},{"full_name":"Gau, Ephraim","first_name":"Ephraim","last_name":"Gau"},{"first_name":"Alessandro","last_name":"Di Marco","full_name":"Di Marco, Alessandro"},{"full_name":"Baldini, Luca","first_name":"Luca","last_name":"Baldini"},{"full_name":"Negro, Michela","last_name":"Negro","first_name":"Michela"},{"full_name":"Omodei, Nicola","first_name":"Nicola","last_name":"Omodei"},{"first_name":"John","last_name":"Rankin","full_name":"Rankin, John"},{"first_name":"Giorgio","last_name":"Matt","full_name":"Matt, Giorgio"},{"full_name":"Pavlov, George G.","last_name":"Pavlov","first_name":"George G."},{"full_name":"Kitaguchi, Takao","last_name":"Kitaguchi","first_name":"Takao"},{"full_name":"Krawczynski, Henric","last_name":"Krawczynski","first_name":"Henric"},{"full_name":"Kislat, Fabian","last_name":"Kislat","first_name":"Fabian"},{"full_name":"Kelly, Ruth","first_name":"Ruth","last_name":"Kelly"},{"full_name":"Agudo, Iván","last_name":"Agudo","first_name":"Iván"},{"last_name":"Antonelli","first_name":"Lucio A.","full_name":"Antonelli, Lucio A."},{"first_name":"Wayne H.","last_name":"Baumgartner","full_name":"Baumgartner, Wayne H."},{"full_name":"Bellazzini, Ronaldo","last_name":"Bellazzini","first_name":"Ronaldo"},{"last_name":"Bianchi","first_name":"Stefano","full_name":"Bianchi, Stefano"},{"full_name":"Bongiorno, Stephen D.","first_name":"Stephen D.","last_name":"Bongiorno"},{"first_name":"Raffaella","last_name":"Bonino","full_name":"Bonino, Raffaella"},{"last_name":"Brez","first_name":"Alessandro","full_name":"Brez, Alessandro"},{"first_name":"Niccolò","last_name":"Bucciantini","full_name":"Bucciantini, Niccolò"},{"last_name":"Capitanio","first_name":"Fiamma","full_name":"Capitanio, Fiamma"},{"full_name":"Castellano, Simone","last_name":"Castellano","first_name":"Simone"},{"full_name":"Cavazzuti, Elisabetta","last_name":"Cavazzuti","first_name":"Elisabetta"},{"full_name":"Chen, Chieng-Ting","last_name":"Chen","first_name":"Chieng-Ting"},{"full_name":"Ciprini, Stefano","first_name":"Stefano","last_name":"Ciprini"},{"last_name":"Costa","first_name":"Enrico","full_name":"Costa, Enrico"},{"last_name":"De Rosa","first_name":"Alessandra","full_name":"De Rosa, Alessandra"},{"first_name":"Ettore","last_name":"Del Monte","full_name":"Del Monte, Ettore"},{"last_name":"Di Gesu","first_name":"Laura","full_name":"Di Gesu, Laura"},{"full_name":"Donnarumma, Immacolata","first_name":"Immacolata","last_name":"Donnarumma"},{"full_name":"Doroshenko, Victor","first_name":"Victor","last_name":"Doroshenko"},{"full_name":"Dovčiak, Michal","last_name":"Dovčiak","first_name":"Michal"},{"full_name":"Ehlert, Steven R.","first_name":"Steven R.","last_name":"Ehlert"},{"full_name":"Enoto, Teruaki","first_name":"Teruaki","last_name":"Enoto"},{"full_name":"Evangelista, Yuri","first_name":"Yuri","last_name":"Evangelista"},{"full_name":"Fabiani, Sergio","first_name":"Sergio","last_name":"Fabiani"},{"last_name":"Ferrazzoli","first_name":"Riccardo","full_name":"Ferrazzoli, Riccardo"},{"last_name":"Garcia","first_name":"Javier A.","full_name":"Garcia, Javier A."},{"full_name":"Gunji, Shuichi","last_name":"Gunji","first_name":"Shuichi"},{"first_name":"Kiyoshi","last_name":"Hayashida","full_name":"Hayashida, Kiyoshi"},{"full_name":"Iwakiri, Wataru","first_name":"Wataru","last_name":"Iwakiri"},{"first_name":"Svetlana G.","last_name":"Jorstad","full_name":"Jorstad, Svetlana G."},{"full_name":"Kaaret, Philip","last_name":"Kaaret","first_name":"Philip"},{"full_name":"Karas, Vladimir","last_name":"Karas","first_name":"Vladimir"},{"first_name":"Jeffery J.","last_name":"Kolodziejczak","full_name":"Kolodziejczak, Jeffery J."},{"full_name":"Latronico, Luca","first_name":"Luca","last_name":"Latronico"},{"full_name":"Liodakis, Ioannis","first_name":"Ioannis","last_name":"Liodakis"},{"first_name":"Simone","last_name":"Maldera","full_name":"Maldera, Simone"},{"full_name":"Manfreda, Alberto","first_name":"Alberto","last_name":"Manfreda"},{"first_name":"Frédéric","last_name":"Marin","full_name":"Marin, Frédéric"},{"full_name":"Marinucci, Andrea","last_name":"Marinucci","first_name":"Andrea"},{"first_name":"Alan P.","last_name":"Marscher","full_name":"Marscher, Alan P."},{"first_name":"Francesco","last_name":"Massaro","full_name":"Massaro, Francesco"},{"full_name":"Mitsuishi, Ikuyuki","last_name":"Mitsuishi","first_name":"Ikuyuki"},{"full_name":"Mizuno, Tsunefumi","first_name":"Tsunefumi","last_name":"Mizuno"},{"full_name":"Ng, C.-Y.","first_name":"C.-Y.","last_name":"Ng"},{"last_name":"O’Dell","first_name":"Stephen L.","full_name":"O’Dell, Stephen L."},{"full_name":"Oppedisano, Chiara","last_name":"Oppedisano","first_name":"Chiara"},{"last_name":"Papitto","first_name":"Alessandro","full_name":"Papitto, Alessandro"},{"full_name":"Peirson, Abel L.","first_name":"Abel L.","last_name":"Peirson"},{"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","last_name":"Petrucci","full_name":"Petrucci, Pierre-Olivier"},{"full_name":"Pilia, Maura","first_name":"Maura","last_name":"Pilia"},{"full_name":"Possenti, Andrea","last_name":"Possenti","first_name":"Andrea"},{"full_name":"Poutanen, Juri","first_name":"Juri","last_name":"Poutanen"},{"first_name":"Simonetta","last_name":"Puccetti","full_name":"Puccetti, 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.","last_name":"Roberts","full_name":"Roberts, Oliver J."},{"first_name":"Roger W.","last_name":"Romani","full_name":"Romani, Roger W."},{"full_name":"Sgró, Carmelo","first_name":"Carmelo","last_name":"Sgró"},{"full_name":"Slane, Patrick","last_name":"Slane","first_name":"Patrick"},{"full_name":"Soffitta, Paolo","last_name":"Soffitta","first_name":"Paolo"},{"first_name":"Gloria","last_name":"Spandre","full_name":"Spandre, Gloria"},{"full_name":"Swartz, Douglas A.","last_name":"Swartz","first_name":"Douglas A."},{"first_name":"Fabrizio","last_name":"Tavecchio","full_name":"Tavecchio, Fabrizio"},{"first_name":"Yuzuru","last_name":"Tawara","full_name":"Tawara, Yuzuru"},{"full_name":"Tennant, Allyn F.","last_name":"Tennant","first_name":"Allyn F."},{"first_name":"Nicholas E.","last_name":"Thomas","full_name":"Thomas, Nicholas E."},{"first_name":"Francesco","last_name":"Tombesi","full_name":"Tombesi, Francesco"},{"first_name":"Alessio","last_name":"Trois","full_name":"Trois, Alessio"},{"first_name":"Sergey S.","last_name":"Tsygankov","full_name":"Tsygankov, Sergey S."},{"last_name":"Vink","first_name":"Jacco","full_name":"Vink, Jacco"},{"last_name":"Weisskopf","first_name":"Martin C.","full_name":"Weisskopf, Martin C."},{"last_name":"Wu","first_name":"Kinwah","full_name":"Wu, Kinwah"},{"first_name":"Fei","last_name":"Xie","full_name":"Xie, Fei"}],"tmp":{"short":"CC BY (4.0)","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"},"abstract":[{"lang":"eng","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."}],"quality_controlled":"1","arxiv":1,"publication_identifier":{"issn":["2041-8205"],"eissn":["2041-8213"]},"type":"journal_article","main_file_link":[{"open_access":"1","url":"https://doi.org/10.3847/2041-8213/acb703"}],"keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"title":"A strong x-ray polarization signal from the magnetar 1RXS J170849.0-400910","language":[{"iso":"eng"}],"scopus_import":"1","issue":"2","date_created":"2024-03-26T09:50:12Z","article_number":"L27","intvolume":"       944","_id":"15202","date_published":"2023-02-15T00:00:00Z","publisher":"American Astronomical Society","article_type":"original","extern":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","oa_version":"Published Version","oa":1,"day":"15","article_processing_charge":"No","volume":944,"date_updated":"2024-04-02T07:15:41Z","doi":"10.3847/2041-8213/acb703","status":"public","publication_status":"published","publication":"The Astrophysical Journal Letters","month":"02","external_id":{"arxiv":["2301.12919"]},"citation":{"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>","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>","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).","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>.","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.","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>.","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."},"year":"2023"},{"external_id":{"arxiv":["2203.09066"]},"year":"2023","citation":{"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.","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>","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>","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.","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>.","short":"J. Heyl, I. Caiazzo, D. González-Caniulef, Proceedings of the International Astronomical Union 16 (2023) 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>."},"month":"02","publication":"Proceedings of the International Astronomical Union","doi":"10.1017/s1743921322000916","publication_status":"published","status":"public","date_updated":"2024-04-04T09:46:17Z","day":"27","article_processing_charge":"No","volume":16,"oa_version":"Published Version","oa":1,"article_type":"original","publisher":"Cambridge University Press","user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","extern":"1","page":"80-91","_id":"15225","intvolume":"        16","date_published":"2023-02-27T00:00:00Z","language":[{"iso":"eng"}],"scopus_import":"1","issue":"S363","date_created":"2024-03-26T10:35:20Z","title":"X-ray polarization at the crossroads","arxiv":1,"publication_identifier":{"issn":["1743-9213"],"eissn":["1743-9221"]},"type":"journal_article","main_file_link":[{"url":"https://doi.org/10.1017/S1743921322000916","open_access":"1"}],"keyword":["Astronomy and Astrophysics","Space and Planetary Science"],"quality_controlled":"1","abstract":[{"lang":"eng","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."}],"author":[{"full_name":"Heyl, Jeremy","first_name":"Jeremy","last_name":"Heyl"},{"full_name":"Caiazzo, Ilaria","last_name":"Caiazzo","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","first_name":"Ilaria","orcid":"0000-0002-4770-5388"},{"full_name":"González-Caniulef, Denis","first_name":"Denis","last_name":"González-Caniulef"}],"tmp":{"short":"CC BY (4.0)","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"}},{"keyword":["Astronomy and Astrophysics","Space and Planetary Science"],"main_file_link":[{"url":"https://doi.org/10.1017/S1743921322000679","open_access":"1"}],"type":"journal_article","publication_identifier":{"eissn":["1743-9221"],"issn":["1743-9213"]},"title":"IXPE simulations for magnetars","tmp":{"short":"CC BY (4.0)","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"},"author":[{"last_name":"González-Caniulef","first_name":"Denis","full_name":"González-Caniulef, Denis"},{"last_name":"Caiazzo","id":"8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d","first_name":"Ilaria","orcid":"0000-0002-4770-5388","full_name":"Caiazzo, Ilaria"},{"full_name":"Heyl, Jeremy","first_name":"Jeremy","last_name":"Heyl"}],"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"}],"quality_controlled":"1","extern":"1","user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","article_type":"original","publisher":"Cambridge University Press","issue":"S363","date_created":"2024-03-26T10:35:43Z","scopus_import":"1","language":[{"iso":"eng"}],"date_published":"2023-02-27T00:00:00Z","intvolume":"        16","_id":"15226","page":"314-317","date_updated":"2024-04-04T12:54:59Z","publication_status":"published","status":"public","doi":"10.1017/s1743921322000679","oa":1,"oa_version":"Published Version","volume":16,"article_processing_charge":"No","day":"27","year":"2023","citation":{"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.","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>","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>","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>.","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>.","short":"D. González-Caniulef, I. Caiazzo, J. Heyl, Proceedings of the International Astronomical Union 16 (2023) 314–317.","ista":"González-Caniulef D, Caiazzo I, Heyl J. 2023. IXPE simulations for magnetars. Proceedings of the International Astronomical Union. 16(S363), 314–317."},"publication":"Proceedings of the International Astronomical Union","month":"02"},{"related_material":{"record":[{"relation":"other","status":"public","id":"14748"}]},"title":"Unified treatment of contact, friction and shock-propagation in rigid body animation","type":"conference_poster","corr_author":"1","abstract":[{"text":"We present a rigid body animation technique which prevents solids from interpenetrating, dissipates energy through friction, and propagates shocks through contacts. We employ the Alternating Direction Method of Multipliers (ADMM) to couple non-smooth Coulomb friction with impact propagation, allowing efficient and accurate non-smooth dynamics along with a correct transmission of impacts through assemblies of rigid bodies. We further extend our method to model adhesion, dynamic friction and lubricated contact.","lang":"eng"}],"department":[{"_id":"GradSch"},{"_id":"ChWo"}],"author":[{"first_name":"Yi-Lu","id":"0b467602-dbcd-11ea-9d1d-ed480aa46b70","last_name":"Chen","full_name":"Chen, Yi-Lu"},{"full_name":"Ly, Mickaël","first_name":"Mickaël","id":"6340d7f0-b48d-11eb-b10d-b7487e71d9f1","last_name":"Ly"},{"orcid":"0000-0001-6646-5546","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","last_name":"Wojtan","full_name":"Wojtan, Christopher J"}],"conference":{"start_date":"2023-08-04","name":"SCA: Symposium on Computer Animation","location":"Los Angeles, CA, United States","end_date":"2023-08-06"},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"ACM","date_published":"2023-08-01T00:00:00Z","_id":"15292","date_created":"2024-04-03T14:57:23Z","acknowledgement":"We thank the anonymous reviewers and the members of the Visual Computing Group at ISTA for their helpful comments. This research was supported by the Scientific Service Units (SSU) of ISTA through resources provided by Scientific Computing, and was funded in part by the European Union (ERC-2021-COG 101045083 CoDiNA)","language":[{"iso":"eng"}],"ddc":["005","531"],"doi":"10.1145/3606037.3606836","publication_status":"published","status":"public","date_updated":"2025-04-14T12:58:27Z","article_processing_charge":"No","day":"01","project":[{"grant_number":"101045083","_id":"34bc2376-11ca-11ed-8bc3-9a3b3961a088","name":"Computational Discovery of Numerical Algorithms for Animation and Simulation of Natural Phenomena"}],"file_date_updated":"2024-04-03T14:58:24Z","file":[{"creator":"yichen","date_updated":"2024-04-03T14:58:24Z","file_size":58770929,"content_type":"video/mp4","date_created":"2024-04-03T14:58:24Z","success":1,"file_name":"video.mp4","file_id":"15293","access_level":"open_access","checksum":"88bdef929ca262ee0eefae0bbc649139","relation":"main_file"},{"success":1,"file_id":"15294","file_name":"frictionPoster_clean.pdf","date_created":"2024-04-03T14:58:23Z","relation":"main_file","access_level":"open_access","checksum":"c06881ba847da365a74ac09c953eaffd","date_updated":"2024-04-03T14:58:23Z","file_size":3951968,"creator":"yichen","content_type":"application/pdf"}],"oa":1,"oa_version":"None","has_accepted_license":"1","year":"2023","citation":{"ieee":"Y.-L. Chen, M. Ly, and C. Wojtan, <i>Unified treatment of contact, friction and shock-propagation in rigid body animation</i>. ACM, 2023.","apa":"Chen, Y.-L., Ly, M., &#38; Wojtan, C. (2023). <i>Unified treatment of contact, friction and shock-propagation in rigid body animation</i>. <i>Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation</i>. Los Angeles, CA, United States: ACM. <a href=\"https://doi.org/10.1145/3606037.3606836\">https://doi.org/10.1145/3606037.3606836</a>","ama":"Chen Y-L, Ly M, Wojtan C. <i>Unified Treatment of Contact, Friction and Shock-Propagation in Rigid Body Animation</i>. ACM; 2023. doi:<a href=\"https://doi.org/10.1145/3606037.3606836\">10.1145/3606037.3606836</a>","chicago":"Chen, Yi-Lu, Mickaël Ly, and Chris Wojtan. <i>Unified Treatment of Contact, Friction and Shock-Propagation in Rigid Body Animation</i>. <i>Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation</i>. ACM, 2023. <a href=\"https://doi.org/10.1145/3606037.3606836\">https://doi.org/10.1145/3606037.3606836</a>.","ista":"Chen Y-L, Ly M, Wojtan C. 2023. Unified treatment of contact, friction and shock-propagation in rigid body animation, ACM,p.","mla":"Chen, Yi-Lu, et al. “Unified Treatment of Contact, Friction and Shock-Propagation in Rigid Body Animation.” <i>Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation</i>, ACM, 2023, doi:<a href=\"https://doi.org/10.1145/3606037.3606836\">10.1145/3606037.3606836</a>.","short":"Y.-L. Chen, M. Ly, C. Wojtan, Unified Treatment of Contact, Friction and Shock-Propagation in Rigid Body Animation, ACM, 2023."},"publication":"Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation","month":"08"},{"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","conference":{"end_date":"2023-12-16","start_date":"2023-12-10","name":"NeurIPS: Neural Information Processing Systems","location":"New Orleans, LA, United States"},"acknowledgement":"MS has received funding from the European Union’s Horizon 2020 research and innovation programme\r\nunder the Marie Skłodowska-Curie grant agreement No 101034413.","language":[{"iso":"eng"}],"scopus_import":"1","date_created":"2024-05-05T22:01:04Z","_id":"15363","alternative_title":["NeurIPS"],"intvolume":"        36","date_published":"2023-12-15T00:00:00Z","publication_identifier":{"issn":["1049-5258"]},"arxiv":1,"type":"conference","corr_author":"1","title":"Knowledge distillation performs partial variance reduction","author":[{"first_name":"Mher","id":"dd546b39-0804-11ed-9c55-ef075c39778d","last_name":"Safaryan","full_name":"Safaryan, Mher"},{"full_name":"Peste, Elena-Alexandra","last_name":"Peste","id":"32D78294-F248-11E8-B48F-1D18A9856A87","first_name":"Elena-Alexandra"},{"id":"4A899BFC-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-3650-940X","first_name":"Dan-Adrian","last_name":"Alistarh","full_name":"Alistarh, Dan-Adrian"}],"department":[{"_id":"DaAl"}],"tmp":{"short":"CC BY (4.0)","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"},"quality_controlled":"1","abstract":[{"lang":"eng","text":"Knowledge distillation is a popular approach for enhancing the performance of \"student\" models, with lower representational capacity, by taking advantage of more powerful \"teacher\" models. Despite its apparent simplicity, the underlying mechanics behind knowledge distillation (KD) are not yet fully understood. In this work, we shed new light on the inner workings of this method, by examining it from an optimization perspective. Specifically, we show that, in the context of linear and deep linear models, KD can be interpreted as a novel type of stochastic variance reduction mechanism. We provide a detailed convergence analysis of the resulting dynamics, which hold under standard assumptions for both strongly-convex and non-convex losses, showing that KD acts as a form of \\emph{partial variance reduction}, which can reduce the stochastic gradient noise, but may not eliminate it completely, depending on the properties of the teacher'' model. Our analysis puts further emphasis on the need for careful parametrization of KD, in particular w.r.t. the weighting of the distillation loss, and is validated empirically on both linear models and deep neural networks."}],"external_id":{"arxiv":["2305.17581"]},"citation":{"ama":"Safaryan M, Krumes A, Alistarh D-A. Knowledge distillation performs partial variance reduction. In: <i>36th Conference on Neural Information Processing Systems</i>. Vol 36. ; 2023.","apa":"Safaryan, M., Krumes, A., &#38; Alistarh, D.-A. (2023). Knowledge distillation performs partial variance reduction. In <i>36th Conference on Neural Information Processing Systems</i> (Vol. 36). New Orleans, LA, United States.","mla":"Safaryan, Mher, et al. “Knowledge Distillation Performs Partial Variance Reduction.” <i>36th Conference on Neural Information Processing Systems</i>, vol. 36, 2023.","short":"M. Safaryan, A. Krumes, D.-A. Alistarh, in:, 36th Conference on Neural Information Processing Systems, 2023.","ista":"Safaryan M, Krumes A, Alistarh D-A. 2023. Knowledge distillation performs partial variance reduction. 36th Conference on Neural Information Processing Systems. NeurIPS: Neural Information Processing Systems, NeurIPS, vol. 36.","chicago":"Safaryan, Mher, Alexandra Krumes, and Dan-Adrian Alistarh. “Knowledge Distillation Performs Partial Variance Reduction.” In <i>36th Conference on Neural Information Processing Systems</i>, Vol. 36, 2023.","ieee":"M. Safaryan, A. Krumes, and D.-A. Alistarh, “Knowledge distillation performs partial variance reduction,” in <i>36th Conference on Neural Information Processing Systems</i>, New Orleans, LA, United States, 2023, vol. 36."},"year":"2023","has_accepted_license":"1","publication":"36th Conference on Neural Information Processing Systems","month":"12","ec_funded":1,"date_updated":"2025-04-14T07:54:55Z","status":"public","publication_status":"published","ddc":["000"],"oa_version":"Published Version","oa":1,"project":[{"grant_number":"101034413","call_identifier":"H2020","_id":"fc2ed2f7-9c52-11eb-aca3-c01059dda49c","name":"IST-BRIDGE: International postdoctoral program"}],"file":[{"creator":"dernst","date_updated":"2024-05-22T08:08:08Z","file_size":672571,"content_type":"application/pdf","date_created":"2024-05-22T08:08:08Z","success":1,"file_id":"15417","file_name":"2023_Neurips_Safaryan.pdf","access_level":"open_access","checksum":"288c5148a85abf24ad5e22a6b1183655","relation":"main_file"}],"file_date_updated":"2024-05-22T08:08:08Z","article_processing_charge":"Yes","day":"15","volume":36}]