---
_id: '15130'
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 infection1.
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.
article_processing_charge: Yes (in subscription journal)
article_type: original
author:
- first_name: Jack Peter Kelly
full_name: Bravo, Jack Peter Kelly
id: 96aecfa5-8931-11ee-af30-aa6a5d6eee0e
last_name: Bravo
orcid: 0000-0003-0456-0753
- first_name: Thomson
full_name: Hallmark, Thomson
last_name: Hallmark
- first_name: Bronson
full_name: Naegle, Bronson
last_name: Naegle
- first_name: Chase L.
full_name: Beisel, Chase L.
last_name: Beisel
- first_name: Ryan N.
full_name: Jackson, Ryan N.
last_name: Jackson
- first_name: David W.
full_name: Taylor, David W.
last_name: Taylor
citation:
ama: Bravo JPK, Hallmark T, Naegle B, Beisel CL, Jackson RN, Taylor DW. RNA targeting
unleashes indiscriminate nuclease activity of CRISPR–Cas12a2. Nature. 2023;613(7944):582-587.
doi:10.1038/s41586-022-05560-w
apa: Bravo, J. P. K., Hallmark, T., Naegle, B., Beisel, C. L., Jackson, R. N., &
Taylor, D. W. (2023). RNA targeting unleashes indiscriminate nuclease activity
of CRISPR–Cas12a2. Nature. Springer Nature. https://doi.org/10.1038/s41586-022-05560-w
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.” Nature. Springer Nature, 2023. https://doi.org/10.1038/s41586-022-05560-w.
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,”
Nature, vol. 613, no. 7944. Springer Nature, pp. 582–587, 2023.
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.
mla: Bravo, Jack Peter Kelly, et al. “RNA Targeting Unleashes Indiscriminate Nuclease
Activity of CRISPR–Cas12a2.” Nature, vol. 613, no. 7944, Springer Nature,
2023, pp. 582–87, doi:10.1038/s41586-022-05560-w.
short: J.P.K. Bravo, T. Hallmark, B. Naegle, C.L. Beisel, R.N. Jackson, D.W. Taylor,
Nature 613 (2023) 582–587.
date_created: 2024-03-20T10:41:36Z
date_published: 2023-01-04T00:00:00Z
date_updated: 2024-06-04T06:30:59Z
day: '04'
doi: 10.1038/s41586-022-05560-w
extern: '1'
external_id:
pmid:
- '36599980'
intvolume: ' 613'
issue: '7944'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1038/s41586-022-05560-w
month: '01'
oa: 1
oa_version: Published Version
page: 582-587
pmid: 1
publication: Nature
publication_identifier:
eissn:
- 1476-4687
issn:
- 0028-0836
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: RNA targeting unleashes indiscriminate nuclease activity of CRISPR–Cas12a2
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 613
year: '2023'
...
---
_id: '15148'
abstract:
- lang: eng
text: 'The basic helix–loop–helix (bHLH) family of transcription factors recognizes
DNA motifs known as E-boxes (CANNTG) and includes 108 members1.
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. 2,3). 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
patch4, the CLOCK-BMAL1 Per-Arnt-Sim (PAS) dimerization domains
engage the histone octamer disc. Binding of tandem E-boxes5–7
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.'
article_processing_charge: No
article_type: original
author:
- first_name: Alicia
full_name: Michael, Alicia
id: 6437c950-2a03-11ee-914d-d6476dd7b75c
last_name: Michael
orcid: 0000-0002-6080-839X
- first_name: Lisa
full_name: Stoos, Lisa
last_name: Stoos
- first_name: Priya
full_name: Crosby, Priya
last_name: Crosby
- first_name: Nikolas
full_name: Eggers, Nikolas
last_name: Eggers
- first_name: Xinyu Y.
full_name: Nie, Xinyu Y.
last_name: Nie
- first_name: Kristina
full_name: Makasheva, Kristina
last_name: Makasheva
- first_name: Martina
full_name: Minnich, Martina
last_name: Minnich
- first_name: Kelly L.
full_name: Healy, Kelly L.
last_name: Healy
- first_name: Joscha
full_name: Weiss, Joscha
last_name: Weiss
- first_name: Georg
full_name: Kempf, Georg
last_name: Kempf
- first_name: Simone
full_name: Cavadini, Simone
last_name: Cavadini
- first_name: Lukas
full_name: Kater, Lukas
last_name: Kater
- first_name: Jan
full_name: Seebacher, Jan
last_name: Seebacher
- first_name: Luca
full_name: Vecchia, Luca
last_name: Vecchia
- first_name: Deyasini
full_name: Chakraborty, Deyasini
last_name: Chakraborty
- first_name: Luke
full_name: Isbel, Luke
last_name: Isbel
- first_name: Ralph S.
full_name: Grand, Ralph S.
last_name: Grand
- first_name: Florian
full_name: Andersch, Florian
last_name: Andersch
- first_name: Jennifer L.
full_name: Fribourgh, Jennifer L.
last_name: Fribourgh
- first_name: Dirk
full_name: Schübeler, Dirk
last_name: Schübeler
- first_name: Johannes
full_name: Zuber, Johannes
last_name: Zuber
- first_name: Andrew C.
full_name: Liu, Andrew C.
last_name: Liu
- first_name: Peter B.
full_name: Becker, Peter B.
last_name: Becker
- first_name: Beat
full_name: Fierz, Beat
last_name: Fierz
- first_name: Carrie L.
full_name: Partch, Carrie L.
last_name: Partch
- first_name: Jerome S.
full_name: Menet, Jerome S.
last_name: Menet
- first_name: Nicolas H.
full_name: Thomä, Nicolas H.
last_name: Thomä
citation:
ama: Michael AK, Stoos L, Crosby P, et al. Cooperation between bHLH transcription
factors and histones for DNA access. Nature. 2023;619(7969):385-393. doi:10.1038/s41586-023-06282-3
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. Nature. Springer Nature. https://doi.org/10.1038/s41586-023-06282-3
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.” Nature. Springer Nature, 2023. https://doi.org/10.1038/s41586-023-06282-3.
ieee: A. K. Michael et al., “Cooperation between bHLH transcription factors
and histones for DNA access,” Nature, vol. 619, no. 7969. Springer Nature,
pp. 385–393, 2023.
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.
mla: Michael, Alicia K., et al. “Cooperation between BHLH Transcription Factors
and Histones for DNA Access.” Nature, vol. 619, no. 7969, Springer Nature,
2023, pp. 385–93, doi:10.1038/s41586-023-06282-3.
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.
date_created: 2024-03-21T07:52:44Z
date_published: 2023-07-05T00:00:00Z
date_updated: 2024-03-25T12:42:29Z
day: '05'
doi: 10.1038/s41586-023-06282-3
extern: '1'
intvolume: ' 619'
issue: '7969'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1038/s41586-023-06282-3
month: '07'
oa: 1
oa_version: Published Version
page: 385-393
publication: Nature
publication_identifier:
eissn:
- 1476-4687
issn:
- 0028-0836
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Cooperation between bHLH transcription factors and histones for DNA access
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 619
year: '2023'
...
---
_id: '15149'
abstract:
- lang: eng
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.
article_processing_charge: No
article_type: original
author:
- first_name: Luke
full_name: Isbel, Luke
last_name: Isbel
- first_name: Murat
full_name: Iskar, Murat
last_name: Iskar
- first_name: Sevi
full_name: Durdu, Sevi
last_name: Durdu
- first_name: Joscha
full_name: Weiss, Joscha
last_name: Weiss
- first_name: Ralph S.
full_name: Grand, Ralph S.
last_name: Grand
- first_name: Eric
full_name: Hietter-Pfeiffer, Eric
last_name: Hietter-Pfeiffer
- first_name: Zuzanna
full_name: Kozicka, Zuzanna
last_name: Kozicka
- first_name: Alicia
full_name: Michael, Alicia
id: 6437c950-2a03-11ee-914d-d6476dd7b75c
last_name: Michael
orcid: 0000-0002-6080-839X
- first_name: Lukas
full_name: Burger, Lukas
last_name: Burger
- first_name: Nicolas H.
full_name: Thomä, Nicolas H.
last_name: Thomä
- first_name: Dirk
full_name: Schübeler, Dirk
last_name: Schübeler
citation:
ama: Isbel L, Iskar M, Durdu S, et al. Readout of histone methylation by Trim24
locally restricts chromatin opening by p53. Nature Structural & Molecular
Biology. 2023;30(7):948-957. doi:10.1038/s41594-023-01021-8
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. Nature Structural & Molecular Biology. Springer
Nature. https://doi.org/10.1038/s41594-023-01021-8
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.” Nature Structural & Molecular
Biology. Springer Nature, 2023. https://doi.org/10.1038/s41594-023-01021-8.
ieee: L. Isbel et al., “Readout of histone methylation by Trim24 locally
restricts chromatin opening by p53,” Nature Structural & Molecular Biology,
vol. 30, no. 7. Springer Nature, pp. 948–957, 2023.
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 &
Molecular Biology. 30(7), 948–957.
mla: Isbel, Luke, et al. “Readout of Histone Methylation by Trim24 Locally Restricts
Chromatin Opening by P53.” Nature Structural & Molecular Biology, vol.
30, no. 7, Springer Nature, 2023, pp. 948–57, doi:10.1038/s41594-023-01021-8.
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
& Molecular Biology 30 (2023) 948–957.
date_created: 2024-03-21T07:53:24Z
date_published: 2023-06-29T00:00:00Z
date_updated: 2024-03-25T12:37:20Z
day: '29'
doi: 10.1038/s41594-023-01021-8
extern: '1'
external_id:
pmid:
- '37386214'
intvolume: ' 30'
issue: '7'
keyword:
- Molecular Biology
- Structural Biology
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1038/s41594-023-01021-8
month: '06'
oa: 1
oa_version: Published Version
page: 948-957
pmid: 1
publication: Nature Structural & Molecular Biology
publication_identifier:
eissn:
- 1545-9985
issn:
- 1545-9993
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Readout of histone methylation by Trim24 locally restricts chromatin opening
by p53
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 30
year: '2023'
...
---
_id: '15173'
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.'
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."
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Matthew Alan
full_name: Kwan, Matthew Alan
id: 5fca0887-a1db-11eb-95d1-ca9d5e0453b3
last_name: Kwan
orcid: 0000-0002-4003-7567
- first_name: Ashwin
full_name: Sah, Ashwin
last_name: Sah
- first_name: Mehtaab
full_name: Sawhney, Mehtaab
last_name: Sawhney
citation:
ama: Kwan MA, Sah A, Sawhney M. Enumerating matroids and linear spaces. Comptes
Rendus Mathematique. 2023;361(G2):565-575. doi:10.5802/crmath.423
apa: Kwan, M. A., Sah, A., & Sawhney, M. (2023). Enumerating matroids and linear
spaces. Comptes Rendus Mathematique. Academie des Sciences. https://doi.org/10.5802/crmath.423
chicago: Kwan, Matthew Alan, Ashwin Sah, and Mehtaab Sawhney. “Enumerating Matroids
and Linear Spaces.” Comptes Rendus Mathematique. Academie des Sciences,
2023. https://doi.org/10.5802/crmath.423.
ieee: M. A. Kwan, A. Sah, and M. Sawhney, “Enumerating matroids and linear spaces,”
Comptes Rendus Mathematique, vol. 361, no. G2. Academie des Sciences, pp.
565–575, 2023.
ista: Kwan MA, Sah A, Sawhney M. 2023. Enumerating matroids and linear spaces. Comptes
Rendus Mathematique. 361(G2), 565–575.
mla: Kwan, Matthew Alan, et al. “Enumerating Matroids and Linear Spaces.” Comptes
Rendus Mathematique, vol. 361, no. G2, Academie des Sciences, 2023, pp. 565–75,
doi:10.5802/crmath.423.
short: M.A. Kwan, A. Sah, M. Sawhney, Comptes Rendus Mathematique 361 (2023) 565–575.
date_created: 2024-03-24T23:01:00Z
date_published: 2023-02-01T00:00:00Z
date_updated: 2025-09-09T14:26:32Z
day: '01'
ddc:
- '510'
department:
- _id: MaKw
doi: 10.5802/crmath.423
external_id:
arxiv:
- '2112.03788'
isi:
- '001167671400009'
file:
- access_level: open_access
checksum: d1d0e0a854a79ae95fb66d75d9117a68
content_type: application/pdf
creator: dernst
date_created: 2024-03-25T07:21:52Z
date_updated: 2024-03-25T07:21:52Z
file_id: '15174'
file_name: 2023_ComptesRendusMath_Kwan.pdf
file_size: 598097
relation: main_file
success: 1
file_date_updated: 2024-03-25T07:21:52Z
has_accepted_license: '1'
intvolume: ' 361'
isi: 1
issue: G2
language:
- iso: eng
month: '02'
oa: 1
oa_version: Published Version
page: 565-575
publication: Comptes Rendus Mathematique
publication_identifier:
eissn:
- 1778-3569
issn:
- 1631-073X
publication_status: published
publisher: Academie des Sciences
quality_controlled: '1'
scopus_import: '1'
status: public
title: Enumerating matroids and linear spaces
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 361
year: '2023'
...
---
_id: '15190'
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.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Jeremy
full_name: Heyl, Jeremy
last_name: Heyl
- first_name: Roberto
full_name: Taverna, Roberto
last_name: Taverna
- first_name: Roberto
full_name: Turolla, Roberto
last_name: Turolla
- first_name: Gian Luca
full_name: Israel, Gian Luca
last_name: Israel
- first_name: Mason
full_name: Ng, Mason
last_name: Ng
- first_name: Demet
full_name: Kırmızıbayrak, Demet
last_name: Kırmızıbayrak
- first_name: Denis
full_name: González-Caniulef, Denis
last_name: González-Caniulef
- first_name: Ilaria
full_name: Caiazzo, Ilaria
id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
last_name: Caiazzo
orcid: 0000-0002-4770-5388
- first_name: Silvia
full_name: Zane, Silvia
last_name: Zane
- first_name: Steven R
full_name: Ehlert, Steven R
last_name: Ehlert
- first_name: Michela
full_name: Negro, Michela
last_name: Negro
- first_name: Iván
full_name: Agudo, Iván
last_name: Agudo
- first_name: Lucio Angelo
full_name: Antonelli, Lucio Angelo
last_name: Antonelli
- first_name: Matteo
full_name: Bachetti, Matteo
last_name: Bachetti
- first_name: Luca
full_name: Baldini, Luca
last_name: Baldini
- first_name: Wayne H
full_name: Baumgartner, Wayne H
last_name: Baumgartner
- first_name: Ronaldo
full_name: Bellazzini, Ronaldo
last_name: Bellazzini
- first_name: Stefano
full_name: Bianchi, Stefano
last_name: Bianchi
- first_name: Stephen D
full_name: Bongiorno, Stephen D
last_name: Bongiorno
- first_name: Raffaella
full_name: Bonino, Raffaella
last_name: Bonino
- first_name: Alessandro
full_name: Brez, Alessandro
last_name: Brez
- first_name: Niccolò
full_name: Bucciantini, Niccolò
last_name: Bucciantini
- first_name: Fiamma
full_name: Capitanio, Fiamma
last_name: Capitanio
- first_name: Simone
full_name: Castellano, Simone
last_name: Castellano
- first_name: Elisabetta
full_name: Cavazzuti, Elisabetta
last_name: Cavazzuti
- first_name: Chien-Ting
full_name: Chen, Chien-Ting
last_name: Chen
- first_name: Stefano
full_name: Ciprini, Stefano
last_name: Ciprini
- first_name: Enrico
full_name: Costa, Enrico
last_name: Costa
- first_name: Alessandra
full_name: De Rosa, Alessandra
last_name: De Rosa
- first_name: Ettore
full_name: Del Monte, Ettore
last_name: Del Monte
- first_name: Laura
full_name: Di Gesu, Laura
last_name: Di Gesu
- first_name: Niccolò
full_name: Di Lalla, Niccolò
last_name: Di Lalla
- first_name: Alessandro
full_name: Di Marco, Alessandro
last_name: Di Marco
- first_name: Immacolata
full_name: Donnarumma, Immacolata
last_name: Donnarumma
- first_name: Victor
full_name: Doroshenko, Victor
last_name: Doroshenko
- first_name: Michal
full_name: Dovčiak, Michal
last_name: Dovčiak
- first_name: Teruaki
full_name: Enoto, Teruaki
last_name: Enoto
- first_name: Yuri
full_name: Evangelista, Yuri
last_name: Evangelista
- first_name: Sergio
full_name: Fabiani, Sergio
last_name: Fabiani
- first_name: Riccardo
full_name: Ferrazzoli, Riccardo
last_name: Ferrazzoli
- first_name: Javier A
full_name: Garcia, Javier A
last_name: Garcia
- first_name: Shuichi
full_name: Gunji, Shuichi
last_name: Gunji
- first_name: Kiyoshi
full_name: Hayashida, Kiyoshi
last_name: Hayashida
- first_name: Wataru
full_name: Iwakiri, Wataru
last_name: Iwakiri
- first_name: Svetlana G
full_name: Jorstad, Svetlana G
last_name: Jorstad
- first_name: Philip
full_name: Kaaret, Philip
last_name: Kaaret
- first_name: Vladimir
full_name: Karas, Vladimir
last_name: Karas
- first_name: Fabian
full_name: Kislat, Fabian
last_name: Kislat
- first_name: Takao
full_name: Kitaguchi, Takao
last_name: Kitaguchi
- first_name: Jeffery J
full_name: Kolodziejczak, Jeffery J
last_name: Kolodziejczak
- first_name: Henric
full_name: Krawczynski, Henric
last_name: Krawczynski
- first_name: Fabio La
full_name: Monaca, Fabio La
last_name: Monaca
- first_name: Luca
full_name: Latronico, Luca
last_name: Latronico
- first_name: Ioannis
full_name: Liodakis, Ioannis
last_name: Liodakis
- first_name: Simone
full_name: Maldera, Simone
last_name: Maldera
- first_name: Alberto
full_name: Manfreda, Alberto
last_name: Manfreda
- first_name: Frédéric
full_name: Marin, Frédéric
last_name: Marin
- first_name: Andrea
full_name: Marinucci, Andrea
last_name: Marinucci
- first_name: Alan P
full_name: Marscher, Alan P
last_name: Marscher
- first_name: Herman L
full_name: Marshall, Herman L
last_name: Marshall
- first_name: Francesco
full_name: Massaro, Francesco
last_name: Massaro
- first_name: Giorgio
full_name: Matt, Giorgio
last_name: Matt
- first_name: Ikuyuki
full_name: Mitsuishi, Ikuyuki
last_name: Mitsuishi
- first_name: Tsunefumi
full_name: Mizuno, Tsunefumi
last_name: Mizuno
- first_name: Fabio
full_name: Muleri, Fabio
last_name: Muleri
- first_name: C-Y
full_name: Ng, C-Y
last_name: Ng
- first_name: Stephen L
full_name: O’Dell, Stephen L
last_name: O’Dell
- first_name: Nicola
full_name: Omodei, Nicola
last_name: Omodei
- first_name: Chiara
full_name: Oppedisano, Chiara
last_name: Oppedisano
- first_name: Alessandro
full_name: Papitto, Alessandro
last_name: Papitto
- first_name: George G
full_name: Pavlov, George G
last_name: Pavlov
- first_name: Abel Lawrence
full_name: Peirson, Abel Lawrence
last_name: Peirson
- first_name: Matteo
full_name: Perri, Matteo
last_name: Perri
- first_name: Melissa
full_name: Pesce-Rollins, Melissa
last_name: Pesce-Rollins
- first_name: Pierre-Olivier
full_name: Petrucci, Pierre-Olivier
last_name: Petrucci
- first_name: Maura
full_name: Pilia, Maura
last_name: Pilia
- first_name: Andrea
full_name: Possenti, Andrea
last_name: Possenti
- first_name: Juri
full_name: Poutanen, Juri
last_name: Poutanen
- first_name: Simonetta
full_name: Puccetti, Simonetta
last_name: Puccetti
- first_name: Brian D
full_name: Ramsey, Brian D
last_name: Ramsey
- first_name: John
full_name: Rankin, John
last_name: Rankin
- first_name: Ajay
full_name: Ratheesh, Ajay
last_name: Ratheesh
- first_name: Oliver J
full_name: Roberts, Oliver J
last_name: Roberts
- first_name: Roger W
full_name: Romani, Roger W
last_name: Romani
- first_name: Carmelo
full_name: Sgrò, Carmelo
last_name: Sgrò
- first_name: Patrick
full_name: Slane, Patrick
last_name: Slane
- first_name: Paolo
full_name: Soffitta, Paolo
last_name: Soffitta
- first_name: Gloria
full_name: Spandre, Gloria
last_name: Spandre
- first_name: Douglas A
full_name: Swartz, Douglas A
last_name: Swartz
- first_name: Toru
full_name: Tamagawa, Toru
last_name: Tamagawa
- first_name: Fabrizio
full_name: Tavecchio, Fabrizio
last_name: Tavecchio
- first_name: Yuzuru
full_name: Tawara, Yuzuru
last_name: Tawara
- first_name: Allyn F
full_name: Tennant, Allyn F
last_name: Tennant
- first_name: Nicholas E
full_name: Thomas, Nicholas E
last_name: Thomas
- first_name: Francesco
full_name: Tombesi, Francesco
last_name: Tombesi
- first_name: Alessio
full_name: Trois, Alessio
last_name: Trois
- first_name: Sergey S
full_name: Tsygankov, Sergey S
last_name: Tsygankov
- first_name: Jacco
full_name: Vink, Jacco
last_name: Vink
- first_name: Martin C
full_name: Weisskopf, Martin C
last_name: Weisskopf
- first_name: Kinwah
full_name: Wu, Kinwah
last_name: Wu
- first_name: Fei
full_name: Xie, Fei
last_name: Xie
citation:
ama: Heyl J, Taverna R, Turolla R, et al. The detection of polarized X-ray emission
from the magnetar 1E 2259+586. Monthly Notices of the Royal Astronomical Society.
2023;527(4):12219-12231. doi:10.1093/mnras/stad3680
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. Monthly Notices of the Royal Astronomical Society. Oxford
University Press. https://doi.org/10.1093/mnras/stad3680
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.” Monthly Notices of the Royal
Astronomical Society. Oxford University Press, 2023. https://doi.org/10.1093/mnras/stad3680.
ieee: J. Heyl et al., “The detection of polarized X-ray emission from the
magnetar 1E 2259+586,” Monthly Notices of the Royal Astronomical Society,
vol. 527, no. 4. Oxford University Press, pp. 12219–12231, 2023.
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.
mla: Heyl, Jeremy, et al. “The Detection of Polarized X-Ray Emission from the Magnetar
1E 2259+586.” Monthly Notices of the Royal Astronomical Society, vol. 527,
no. 4, Oxford University Press, 2023, pp. 12219–31, doi:10.1093/mnras/stad3680.
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.
date_created: 2024-03-26T09:44:24Z
date_published: 2023-12-01T00:00:00Z
date_updated: 2024-04-02T06:51:04Z
day: '01'
doi: 10.1093/mnras/stad3680
extern: '1'
external_id:
arxiv:
- '2311.03637'
intvolume: ' 527'
issue: '4'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1093/mnras/stad3680
month: '12'
oa: 1
oa_version: Published Version
page: 12219-12231
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
eissn:
- 1365-2966
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: The detection of polarized X-ray emission from the magnetar 1E 2259+586
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 527
year: '2023'
...
---
_id: '15192'
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.
article_number: L41
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: David R.
full_name: Miller, David R.
last_name: Miller
- first_name: Ilaria
full_name: Caiazzo, Ilaria
id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
last_name: Caiazzo
orcid: 0000-0002-4770-5388
- first_name: Jeremy
full_name: Heyl, Jeremy
last_name: Heyl
- first_name: Harvey B.
full_name: Richer, Harvey B.
last_name: Richer
- first_name: Kareem
full_name: El-Badry, Kareem
last_name: El-Badry
- first_name: Antonio C.
full_name: Rodriguez, Antonio C.
last_name: Rodriguez
- first_name: Zachary P.
full_name: Vanderbosch, Zachary P.
last_name: Vanderbosch
- first_name: Jan
full_name: van Roestel, Jan
last_name: van Roestel
citation:
ama: Miller DR, Caiazzo I, Heyl J, et al. An extremely massive white dwarf escaped
from the Hyades star cluster. The Astrophysical Journal Letters. 2023;956(2).
doi:10.3847/2041-8213/acffc4
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. The Astrophysical Journal Letters. American Astronomical
Society. https://doi.org/10.3847/2041-8213/acffc4
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.” The Astrophysical
Journal Letters. American Astronomical Society, 2023. https://doi.org/10.3847/2041-8213/acffc4.
ieee: D. R. Miller et al., “An extremely massive white dwarf escaped from
the Hyades star cluster,” The Astrophysical Journal Letters, vol. 956,
no. 2. American Astronomical Society, 2023.
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.
mla: Miller, David R., et al. “An Extremely Massive White Dwarf Escaped from the
Hyades Star Cluster.” The Astrophysical Journal Letters, vol. 956, no.
2, L41, American Astronomical Society, 2023, doi:10.3847/2041-8213/acffc4.
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).
date_created: 2024-03-26T09:45:38Z
date_published: 2023-10-19T00:00:00Z
date_updated: 2024-04-02T06:56:01Z
day: '19'
doi: 10.3847/2041-8213/acffc4
extern: '1'
external_id:
arxiv:
- '2310.03204'
intvolume: ' 956'
issue: '2'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3847/2041-8213/acffc4
month: '10'
oa: 1
oa_version: Published Version
publication: The Astrophysical Journal Letters
publication_identifier:
eissn:
- 2041-8213
issn:
- 2041-8205
publication_status: published
publisher: American Astronomical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: An extremely massive white dwarf escaped from the Hyades star cluster
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 956
year: '2023'
...
---
_id: '15193'
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.
article_number: A57
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Victor
full_name: Doroshenko, Victor
last_name: Doroshenko
- first_name: Juri
full_name: Poutanen, Juri
last_name: Poutanen
- first_name: Jeremy
full_name: Heyl, Jeremy
last_name: Heyl
- first_name: Sergey S.
full_name: Tsygankov, Sergey S.
last_name: Tsygankov
- first_name: Ilaria
full_name: Caiazzo, Ilaria
id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
last_name: Caiazzo
orcid: 0000-0002-4770-5388
- first_name: Roberto
full_name: Turolla, Roberto
last_name: Turolla
- first_name: Alexandra
full_name: Veledina, Alexandra
last_name: Veledina
- first_name: Martin C.
full_name: Weisskopf, Martin C.
last_name: Weisskopf
- first_name: Sofia V.
full_name: Forsblom, Sofia V.
last_name: Forsblom
- first_name: Denis
full_name: González-Caniulef, Denis
last_name: González-Caniulef
- first_name: Vladislav
full_name: Loktev, Vladislav
last_name: Loktev
- first_name: Christian
full_name: Malacaria, Christian
last_name: Malacaria
- first_name: Alexander A.
full_name: Mushtukov, Alexander A.
last_name: Mushtukov
- first_name: Valery F.
full_name: Suleimanov, Valery F.
last_name: Suleimanov
- first_name: Alexander A.
full_name: Lutovinov, Alexander A.
last_name: Lutovinov
- first_name: Ilya A.
full_name: Mereminskiy, Ilya A.
last_name: Mereminskiy
- first_name: Sergey V.
full_name: Molkov, Sergey V.
last_name: Molkov
- first_name: Alexander
full_name: Salganik, Alexander
last_name: Salganik
- first_name: Andrea
full_name: Santangelo, Andrea
last_name: Santangelo
- first_name: Andrei V.
full_name: Berdyugin, Andrei V.
last_name: Berdyugin
- first_name: Vadim
full_name: Kravtsov, Vadim
last_name: Kravtsov
- first_name: Anagha P.
full_name: Nitindala, Anagha P.
last_name: Nitindala
- first_name: Iván
full_name: Agudo, Iván
last_name: Agudo
- first_name: Lucio A.
full_name: Antonelli, Lucio A.
last_name: Antonelli
- first_name: Matteo
full_name: Bachetti, Matteo
last_name: Bachetti
- first_name: Luca
full_name: Baldini, Luca
last_name: Baldini
- first_name: Wayne H.
full_name: Baumgartner, Wayne H.
last_name: Baumgartner
- first_name: Ronaldo
full_name: Bellazzini, Ronaldo
last_name: Bellazzini
- first_name: Stefano
full_name: Bianchi, Stefano
last_name: Bianchi
- first_name: Stephen D.
full_name: Bongiorno, Stephen D.
last_name: Bongiorno
- first_name: Raffaella
full_name: Bonino, Raffaella
last_name: Bonino
- first_name: Alessandro
full_name: Brez, Alessandro
last_name: Brez
- first_name: Niccolò
full_name: Bucciantini, Niccolò
last_name: Bucciantini
- first_name: Fiamma
full_name: Capitanio, Fiamma
last_name: Capitanio
- first_name: Simone
full_name: Castellano, Simone
last_name: Castellano
- first_name: Elisabetta
full_name: Cavazzuti, Elisabetta
last_name: Cavazzuti
- first_name: Chien-Ting
full_name: Chen, Chien-Ting
last_name: Chen
- first_name: Stefano
full_name: Ciprini, Stefano
last_name: Ciprini
- first_name: Enrico
full_name: Costa, Enrico
last_name: Costa
- first_name: Alessandra
full_name: De Rosa, Alessandra
last_name: De Rosa
- first_name: Ettore
full_name: Del Monte, Ettore
last_name: Del Monte
- first_name: Laura
full_name: Di Gesu, Laura
last_name: Di Gesu
- first_name: Niccolò
full_name: Di Lalla, Niccolò
last_name: Di Lalla
- first_name: Alessandro
full_name: Di Marco, Alessandro
last_name: Di Marco
- first_name: Immacolata
full_name: Donnarumma, Immacolata
last_name: Donnarumma
- first_name: Michal
full_name: Dovčiak, Michal
last_name: Dovčiak
- first_name: Steven R.
full_name: Ehlert, Steven R.
last_name: Ehlert
- first_name: Teruaki
full_name: Enoto, Teruaki
last_name: Enoto
- first_name: Yuri
full_name: Evangelista, Yuri
last_name: Evangelista
- first_name: Sergio
full_name: Fabiani, Sergio
last_name: Fabiani
- first_name: Riccardo
full_name: Ferrazzoli, Riccardo
last_name: Ferrazzoli
- first_name: Javier A.
full_name: García, Javier A.
last_name: García
- first_name: Shuichi
full_name: Gunji, Shuichi
last_name: Gunji
- first_name: Kiyoshi
full_name: Hayashida, Kiyoshi
last_name: Hayashida
- first_name: Wataru
full_name: Iwakiri, Wataru
last_name: Iwakiri
- first_name: Svetlana G.
full_name: Jorstad, Svetlana G.
last_name: Jorstad
- first_name: Philip
full_name: Kaaret, Philip
last_name: Kaaret
- first_name: Vladimir
full_name: Karas, Vladimir
last_name: Karas
- first_name: Fabian
full_name: Kislat, Fabian
last_name: Kislat
- first_name: Takao
full_name: Kitaguchi, Takao
last_name: Kitaguchi
- first_name: Jeffery J.
full_name: Kolodziejczak, Jeffery J.
last_name: Kolodziejczak
- first_name: Henric
full_name: Krawczynski, Henric
last_name: Krawczynski
- first_name: Fabio
full_name: La Monaca, Fabio
last_name: La Monaca
- first_name: Luca
full_name: Latronico, Luca
last_name: Latronico
- first_name: Ioannis
full_name: Liodakis, Ioannis
last_name: Liodakis
- first_name: Simone
full_name: Maldera, Simone
last_name: Maldera
- first_name: Alberto
full_name: Manfreda, Alberto
last_name: Manfreda
- first_name: Frédéric
full_name: Marin, Frédéric
last_name: Marin
- first_name: Andrea
full_name: Marinucci, Andrea
last_name: Marinucci
- first_name: Alan P.
full_name: Marscher, Alan P.
last_name: Marscher
- first_name: Herman L.
full_name: Marshall, Herman L.
last_name: Marshall
- first_name: Francesco
full_name: Massaro, Francesco
last_name: Massaro
- first_name: Giorgio
full_name: Matt, Giorgio
last_name: Matt
- first_name: Ikuyuki
full_name: Mitsuishi, Ikuyuki
last_name: Mitsuishi
- first_name: Tsunefumi
full_name: Mizuno, Tsunefumi
last_name: Mizuno
- first_name: Fabio
full_name: Muleri, Fabio
last_name: Muleri
- first_name: Michela
full_name: Negro, Michela
last_name: Negro
- first_name: Chi-Yung
full_name: Ng, Chi-Yung
last_name: Ng
- first_name: Stephen L.
full_name: O’Dell, Stephen L.
last_name: O’Dell
- first_name: Nicola
full_name: Omodei, Nicola
last_name: Omodei
- first_name: Chiara
full_name: Oppedisano, Chiara
last_name: Oppedisano
- first_name: Alessandro
full_name: Papitto, Alessandro
last_name: Papitto
- first_name: George G.
full_name: Pavlov, George G.
last_name: Pavlov
- first_name: Abel L.
full_name: Peirson, Abel L.
last_name: Peirson
- first_name: Matteo
full_name: Perri, Matteo
last_name: Perri
- first_name: Melissa
full_name: Pesce-Rollins, Melissa
last_name: Pesce-Rollins
- first_name: Pierre-Olivier
full_name: Petrucci, Pierre-Olivier
last_name: Petrucci
- first_name: Maura
full_name: Pilia, Maura
last_name: Pilia
- first_name: Andrea
full_name: Possenti, Andrea
last_name: Possenti
- first_name: Simonetta
full_name: Puccetti, Simonetta
last_name: Puccetti
- first_name: Brian D.
full_name: Ramsey, Brian D.
last_name: Ramsey
- first_name: John
full_name: Rankin, John
last_name: Rankin
- first_name: Ajay
full_name: Ratheesh, Ajay
last_name: Ratheesh
- first_name: Oliver J.
full_name: Roberts, Oliver J.
last_name: Roberts
- first_name: Roger W.
full_name: Romani, Roger W.
last_name: Romani
- first_name: Carmelo
full_name: Sgrò, Carmelo
last_name: Sgrò
- first_name: Patrick
full_name: Slane, Patrick
last_name: Slane
- first_name: Paolo
full_name: Soffitta, Paolo
last_name: Soffitta
- first_name: Gloria
full_name: Spandre, Gloria
last_name: Spandre
- first_name: Douglas A.
full_name: Swartz, Douglas A.
last_name: Swartz
- first_name: Toru
full_name: Tamagawa, Toru
last_name: Tamagawa
- first_name: Fabrizio
full_name: Tavecchio, Fabrizio
last_name: Tavecchio
- first_name: Roberto
full_name: Taverna, Roberto
last_name: Taverna
- first_name: Yuzuru
full_name: Tawara, Yuzuru
last_name: Tawara
- first_name: Allyn F.
full_name: Tennant, Allyn F.
last_name: Tennant
- first_name: Nicholas E.
full_name: Thomas, Nicholas E.
last_name: Thomas
- first_name: Francesco
full_name: Tombesi, Francesco
last_name: Tombesi
- first_name: Alessio
full_name: Trois, Alessio
last_name: Trois
- first_name: Jacco
full_name: Vink, Jacco
last_name: Vink
- first_name: Kinwah
full_name: Wu, Kinwah
last_name: Wu
- first_name: Fei
full_name: Xie, Fei
last_name: Xie
- first_name: Silvia
full_name: Zane, Silvia
last_name: Zane
citation:
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. Astronomy & Astrophysics.
2023;677. doi:10.1051/0004-6361/202347088
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. Astronomy & Astrophysics. EDP Sciences.
https://doi.org/10.1051/0004-6361/202347088
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.” Astronomy &
Astrophysics. EDP Sciences, 2023. https://doi.org/10.1051/0004-6361/202347088.
ieee: V. Doroshenko et al., “Complex variations in X-ray polarization in
the X-ray pulsar LS V +44 17/RX J0440.9+4431,” Astronomy & Astrophysics,
vol. 677. EDP Sciences, 2023.
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 & 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.” Astronomy & Astrophysics,
vol. 677, A57, EDP Sciences, 2023, doi:10.1051/0004-6361/202347088.
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
& Astrophysics 677 (2023).
date_created: 2024-03-26T09:46:01Z
date_published: 2023-09-04T00:00:00Z
date_updated: 2024-04-02T06:57:11Z
day: '04'
doi: 10.1051/0004-6361/202347088
extern: '1'
external_id:
arxiv:
- '2306.02116'
intvolume: ' 677'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1051/0004-6361/202347088
month: '09'
oa: 1
oa_version: Published Version
publication: Astronomy & Astrophysics
publication_identifier:
eissn:
- 1432-0746
issn:
- 0004-6361
publication_status: published
publisher: EDP Sciences
quality_controlled: '1'
scopus_import: '1'
status: public
title: Complex variations in X-ray polarization in the X-ray pulsar LS V +44 17/RX
J0440.9+4431
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 677
year: '2023'
...
---
_id: '15194'
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."
article_number: '63'
article_processing_charge: No
article_type: original
author:
- first_name: Antonio C.
full_name: Rodriguez, Antonio C.
last_name: Rodriguez
- first_name: Ilkham
full_name: Galiullin, Ilkham
last_name: Galiullin
- first_name: Marat
full_name: Gilfanov, Marat
last_name: Gilfanov
- first_name: Shrinivas R.
full_name: Kulkarni, Shrinivas R.
last_name: Kulkarni
- first_name: Irek
full_name: Khamitov, Irek
last_name: Khamitov
- first_name: Ilfan
full_name: Bikmaev, Ilfan
last_name: Bikmaev
- first_name: Jan
full_name: van Roestel, Jan
last_name: van Roestel
- first_name: Lev
full_name: Yungelson, Lev
last_name: Yungelson
- first_name: Kareem
full_name: El-Badry, Kareem
last_name: El-Badry
- first_name: Rashid
full_name: Sunayev, Rashid
last_name: Sunayev
- first_name: Thomas A.
full_name: Prince, Thomas A.
last_name: Prince
- first_name: Mikhail
full_name: Buntov, Mikhail
last_name: Buntov
- first_name: Ilaria
full_name: Caiazzo, Ilaria
id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
last_name: Caiazzo
orcid: 0000-0002-4770-5388
- first_name: Andrew
full_name: Drake, Andrew
last_name: Drake
- first_name: Mark
full_name: Gorbachev, Mark
last_name: Gorbachev
- first_name: Matthew J.
full_name: Graham, Matthew J.
last_name: Graham
- first_name: Rustam
full_name: Gumerov, Rustam
last_name: Gumerov
- first_name: Eldar
full_name: Irtuganov, Eldar
last_name: Irtuganov
- first_name: Russ R.
full_name: Laher, Russ R.
last_name: Laher
- first_name: Frank J.
full_name: Masci, Frank J.
last_name: Masci
- first_name: Pavel
full_name: Medvedev, Pavel
last_name: Medvedev
- first_name: Josiah
full_name: Purdum, Josiah
last_name: Purdum
- first_name: Nail
full_name: Sakhibullin, Nail
last_name: Sakhibullin
- first_name: Alexander
full_name: Sklyanov, Alexander
last_name: Sklyanov
- first_name: Roger
full_name: Smith, Roger
last_name: Smith
- first_name: Paula
full_name: Szkody, Paula
last_name: Szkody
- first_name: Zachary P.
full_name: Vanderbosch, Zachary P.
last_name: Vanderbosch
citation:
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. The Astrophysical Journal. 2023;954(1). doi:10.3847/1538-4357/ace698'
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. The Astrophysical Journal. American Astronomical Society.
https://doi.org/10.3847/1538-4357/ace698'
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.” The Astrophysical Journal. American Astronomical
Society, 2023. https://doi.org/10.3847/1538-4357/ace698.'
ieee: 'A. C. Rodriguez et al., “SRGeJ045359.9+622444: A 55 minute period
eclipsing AM Canum Venaticorum star discovered from a joint SRG/eROSITA + ZTF
search,” The Astrophysical Journal, vol. 954, no. 1. American Astronomical
Society, 2023.'
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.'
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.” The
Astrophysical Journal, vol. 954, no. 1, 63, American Astronomical Society,
2023, doi:10.3847/1538-4357/ace698.'
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).
date_created: 2024-03-26T09:46:30Z
date_published: 2023-08-23T00:00:00Z
date_updated: 2024-04-02T06:58:03Z
day: '23'
doi: 10.3847/1538-4357/ace698
extern: '1'
intvolume: ' 954'
issue: '1'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3847/1538-4357/ace698
month: '08'
oa: 1
oa_version: Published Version
publication: The Astrophysical Journal
publication_identifier:
eissn:
- 1538-4357
issn:
- 0004-637X
publication_status: published
publisher: American Astronomical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'SRGeJ045359.9+622444: A 55 minute period eclipsing AM Canum Venaticorum star
discovered from a joint SRG/eROSITA + ZTF search'
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 954
year: '2023'
...
---
_id: '15195'
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.'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Ilaria
full_name: Caiazzo, Ilaria
id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
last_name: Caiazzo
orcid: 0000-0002-4770-5388
- first_name: Kevin B.
full_name: Burdge, Kevin B.
last_name: Burdge
- first_name: Pier-Emmanuel
full_name: Tremblay, Pier-Emmanuel
last_name: Tremblay
- first_name: James
full_name: Fuller, James
last_name: Fuller
- first_name: Lilia
full_name: Ferrario, Lilia
last_name: Ferrario
- first_name: Boris T.
full_name: Gänsicke, Boris T.
last_name: Gänsicke
- first_name: J. J.
full_name: Hermes, J. J.
last_name: Hermes
- first_name: Jeremy
full_name: Heyl, Jeremy
last_name: Heyl
- first_name: Adela
full_name: Kawka, Adela
last_name: Kawka
- first_name: S. R.
full_name: Kulkarni, S. R.
last_name: Kulkarni
- first_name: Thomas R.
full_name: Marsh, Thomas R.
last_name: Marsh
- first_name: Przemek
full_name: Mróz, Przemek
last_name: Mróz
- first_name: Thomas A.
full_name: Prince, Thomas A.
last_name: Prince
- first_name: Harvey B.
full_name: Richer, Harvey B.
last_name: Richer
- first_name: Antonio C.
full_name: Rodriguez, Antonio C.
last_name: Rodriguez
- first_name: Jan
full_name: van Roestel, Jan
last_name: van Roestel
- first_name: Zachary P.
full_name: Vanderbosch, Zachary P.
last_name: Vanderbosch
- first_name: Stéphane
full_name: Vennes, Stéphane
last_name: Vennes
- first_name: Dayal
full_name: Wickramasinghe, Dayal
last_name: Wickramasinghe
- first_name: Vikram S.
full_name: Dhillon, Vikram S.
last_name: Dhillon
- first_name: Stuart P.
full_name: Littlefair, Stuart P.
last_name: Littlefair
- first_name: James
full_name: Munday, James
last_name: Munday
- first_name: Ingrid
full_name: Pelisoli, Ingrid
last_name: Pelisoli
- first_name: Daniel
full_name: Perley, Daniel
last_name: Perley
- first_name: Eric C.
full_name: Bellm, Eric C.
last_name: Bellm
- first_name: Elmé
full_name: Breedt, Elmé
last_name: Breedt
- first_name: Alex J.
full_name: Brown, Alex J.
last_name: Brown
- first_name: Richard
full_name: Dekany, Richard
last_name: Dekany
- first_name: Andrew
full_name: Drake, Andrew
last_name: Drake
- first_name: Martin J.
full_name: Dyer, Martin J.
last_name: Dyer
- first_name: Matthew J.
full_name: Graham, Matthew J.
last_name: Graham
- first_name: Matthew J.
full_name: Green, Matthew J.
last_name: Green
- first_name: Russ R.
full_name: Laher, Russ R.
last_name: Laher
- first_name: Paul
full_name: Kerry, Paul
last_name: Kerry
- first_name: Steven G.
full_name: Parsons, Steven G.
last_name: Parsons
- first_name: Reed L.
full_name: Riddle, Reed L.
last_name: Riddle
- first_name: Ben
full_name: Rusholme, Ben
last_name: Rusholme
- first_name: Dave I.
full_name: Sahman, Dave I.
last_name: Sahman
citation:
ama: Caiazzo I, Burdge KB, Tremblay P-E, et al. A rotating white dwarf shows different
compositions on its opposite faces. Nature. 2023;620(7972):61-66. doi:10.1038/s41586-023-06171-9
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. Nature. Springer Nature. https://doi.org/10.1038/s41586-023-06171-9
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.” Nature. Springer Nature,
2023. https://doi.org/10.1038/s41586-023-06171-9.
ieee: I. Caiazzo et al., “A rotating white dwarf shows different compositions
on its opposite faces,” Nature, vol. 620, no. 7972. Springer Nature, pp.
61–66, 2023.
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.
mla: Caiazzo, Ilaria, et al. “A Rotating White Dwarf Shows Different Compositions
on Its Opposite Faces.” Nature, vol. 620, no. 7972, Springer Nature, 2023,
pp. 61–66, doi:10.1038/s41586-023-06171-9.
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.
date_created: 2024-03-26T09:46:57Z
date_published: 2023-07-19T00:00:00Z
date_updated: 2024-10-14T12:32:28Z
day: '19'
doi: 10.1038/s41586-023-06171-9
extern: '1'
external_id:
arxiv:
- '2308.07430'
intvolume: ' 620'
issue: '7972'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2308.07430
month: '07'
oa: 1
oa_version: Preprint
page: 61-66
publication: Nature
publication_identifier:
eissn:
- 1476-4687
issn:
- 0028-0836
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: A rotating white dwarf shows different compositions on its opposite faces
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 620
year: '2023'
...
---
_id: '15196'
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.
article_number: L1
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Kevin B.
full_name: Burdge, Kevin B.
last_name: Burdge
- first_name: Kareem
full_name: El-Badry, Kareem
last_name: El-Badry
- first_name: Saul
full_name: Rappaport, Saul
last_name: Rappaport
- first_name: Tin Long
full_name: Sunny Wong, Tin Long
last_name: Sunny Wong
- first_name: Evan B.
full_name: Bauer, Evan B.
last_name: Bauer
- first_name: Lars
full_name: Bildsten, Lars
last_name: Bildsten
- first_name: Ilaria
full_name: Caiazzo, Ilaria
id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
last_name: Caiazzo
orcid: 0000-0002-4770-5388
- first_name: Deepto
full_name: Chakrabarty, Deepto
last_name: Chakrabarty
- first_name: Emma
full_name: Chickles, Emma
last_name: Chickles
- first_name: Matthew J.
full_name: Graham, Matthew J.
last_name: Graham
- first_name: Erin
full_name: Kara, Erin
last_name: Kara
- first_name: S. R.
full_name: Kulkarni, S. R.
last_name: Kulkarni
- first_name: Thomas R.
full_name: Marsh, Thomas R.
last_name: Marsh
- first_name: Melania
full_name: Nynka, Melania
last_name: Nynka
- first_name: Thomas A.
full_name: Prince, Thomas A.
last_name: Prince
- first_name: Robert A.
full_name: Simcoe, Robert A.
last_name: Simcoe
- first_name: Jan
full_name: van Roestel, Jan
last_name: van Roestel
- first_name: Zach
full_name: Vanderbosch, Zach
last_name: Vanderbosch
- first_name: Eric C.
full_name: Bellm, Eric C.
last_name: Bellm
- first_name: Richard G.
full_name: Dekany, Richard G.
last_name: Dekany
- first_name: Andrew J.
full_name: Drake, Andrew J.
last_name: Drake
- first_name: George
full_name: Helou, George
last_name: Helou
- first_name: Frank J.
full_name: Masci, Frank J.
last_name: Masci
- first_name: Jennifer
full_name: Milburn, Jennifer
last_name: Milburn
- first_name: Reed
full_name: Riddle, Reed
last_name: Riddle
- first_name: Ben
full_name: Rusholme, Ben
last_name: Rusholme
- first_name: Roger
full_name: Smith, Roger
last_name: Smith
citation:
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. The Astrophysical
Journal Letters. 2023;953(1). doi:10.3847/2041-8213/ace7cf
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. The Astrophysical
Journal Letters. American Astronomical Society. https://doi.org/10.3847/2041-8213/ace7cf
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.” The
Astrophysical Journal Letters. American Astronomical Society, 2023. https://doi.org/10.3847/2041-8213/ace7cf.
ieee: K. B. Burdge et al., “Orbital decay in an accreting and eclipsing 13.7
minute orbital period binary with a luminous donor,” The Astrophysical Journal
Letters, vol. 953, no. 1. American Astronomical Society, 2023.
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.” The Astrophysical Journal
Letters, vol. 953, no. 1, L1, American Astronomical Society, 2023, doi:10.3847/2041-8213/ace7cf.
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).
date_created: 2024-03-26T09:47:22Z
date_published: 2023-08-08T00:00:00Z
date_updated: 2024-04-02T07:01:46Z
day: '08'
doi: 10.3847/2041-8213/ace7cf
extern: '1'
external_id:
arxiv:
- '2303.13573'
intvolume: ' 953'
issue: '1'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3847/2041-8213/ace7cf
month: '08'
oa: 1
oa_version: Published Version
publication: The Astrophysical Journal Letters
publication_identifier:
eissn:
- 2041-8213
issn:
- 2041-8205
publication_status: published
publisher: American Astronomical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Orbital decay in an accreting and eclipsing 13.7 minute orbital period binary
with a luminous donor
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 953
year: '2023'
...
---
_id: '15197'
abstract:
- lang: eng
text: Recently, the inner main belt asteroid (152830) Dinkinesh was identified as
an additional fly- by target for the Lucy mission. The heliocentric orbit and
approximate absolute magnitude of Dinkinesh are known, but little additional information
was available prior to its selection as a target. In particular, the lack of color
spectrophotometry or spectra made it impossible to assign a spectral type to Dinkinesh
from which its albedo could be estimated. We set out to remedy this knowledge
gap by obtaining visible wavelength spectra with the Keck telescope on 2022 November
23 and with Gemini-South on 2022 December 27. The spectra measured with the Keck
I/Low Resolution Imaging Spectrometer (LRIS) and the Gemini South/Gemini Multi-Object
Spectrograph South (GMOS-S) are most similar to the average spectrum of S- and
Sq-type asteroids. The most diagnostic feature is the ≈15 ± 1% silicate absorption
feature at ≈0.9–1.0 μm. Small S- and Sq-type asteroids have moderately high albedos
ranging from 0.17 to 0.35. Using this albedo range for Dinkinesh in combination
with measured absolute magnitude, it is possible to derive an effective diameter
and surface brightness for this body. The albedo, size and surface brightness
are important inputs required for planning a successful encounter by the Lucy
spacecraft.
article_number: '115562'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: B.T.
full_name: Bolin, B.T.
last_name: Bolin
- first_name: K.S.
full_name: Noll, K.S.
last_name: Noll
- first_name: Ilaria
full_name: Caiazzo, Ilaria
id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
last_name: Caiazzo
orcid: 0000-0002-4770-5388
- first_name: C.
full_name: Fremling, C.
last_name: Fremling
- first_name: R.P.
full_name: Binzel, R.P.
last_name: Binzel
citation:
ama: Bolin BT, Noll KS, Caiazzo I, Fremling C, Binzel RP. Keck and Gemini spectral
characterization of Lucy mission fly-by target (152830) Dinkinesh. Icarus.
2023;400. doi:10.1016/j.icarus.2023.115562
apa: Bolin, B. T., Noll, K. S., Caiazzo, I., Fremling, C., & Binzel, R. P. (2023).
Keck and Gemini spectral characterization of Lucy mission fly-by target (152830)
Dinkinesh. Icarus. Elsevier. https://doi.org/10.1016/j.icarus.2023.115562
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.”
Icarus. Elsevier, 2023. https://doi.org/10.1016/j.icarus.2023.115562.
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,”
Icarus, vol. 400. Elsevier, 2023.
ista: Bolin BT, Noll KS, Caiazzo I, Fremling C, Binzel RP. 2023. Keck and Gemini
spectral characterization of Lucy mission fly-by target (152830) Dinkinesh. Icarus.
400, 115562.
mla: Bolin, B. T., et al. “Keck and Gemini Spectral Characterization of Lucy Mission
Fly-by Target (152830) Dinkinesh.” Icarus, vol. 400, 115562, Elsevier,
2023, doi:10.1016/j.icarus.2023.115562.
short: B.T. Bolin, K.S. Noll, I. Caiazzo, C. Fremling, R.P. Binzel, Icarus 400 (2023).
date_created: 2024-03-26T09:47:44Z
date_published: 2023-04-07T00:00:00Z
date_updated: 2024-04-02T07:02:28Z
day: '07'
doi: 10.1016/j.icarus.2023.115562
extern: '1'
external_id:
arxiv:
- '2303.08130'
intvolume: ' 400'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2303.08130
month: '04'
oa: 1
oa_version: Preprint
publication: Icarus
publication_identifier:
issn:
- 0019-1035
publication_status: published
publisher: Elsevier
quality_controlled: '1'
scopus_import: '1'
status: public
title: Keck and Gemini spectral characterization of Lucy mission fly-by target (152830)
Dinkinesh
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 400
year: '2023'
...
---
_id: '15198'
abstract:
- lang: eng
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.
article_number: L101303
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Leesa
full_name: Fleury, Leesa
last_name: Fleury
- first_name: Ilaria
full_name: Caiazzo, Ilaria
id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
last_name: Caiazzo
orcid: 0000-0002-4770-5388
- first_name: Jeremy
full_name: Heyl, Jeremy
last_name: Heyl
citation:
ama: Fleury L, Caiazzo I, Heyl J. Constraining axions with ZTF J1901+1458. Physical
Review D. 2023;107(10). doi:10.1103/physrevd.107.l101303
apa: Fleury, L., Caiazzo, I., & Heyl, J. (2023). Constraining axions with ZTF
J1901+1458. Physical Review D. American Physical Society. https://doi.org/10.1103/physrevd.107.l101303
chicago: Fleury, Leesa, Ilaria Caiazzo, and Jeremy Heyl. “Constraining Axions with
ZTF J1901+1458.” Physical Review D. American Physical Society, 2023. https://doi.org/10.1103/physrevd.107.l101303.
ieee: L. Fleury, I. Caiazzo, and J. Heyl, “Constraining axions with ZTF J1901+1458,”
Physical Review D, vol. 107, no. 10. American Physical Society, 2023.
ista: Fleury L, Caiazzo I, Heyl J. 2023. Constraining axions with ZTF J1901+1458.
Physical Review D. 107(10), L101303.
mla: Fleury, Leesa, et al. “Constraining Axions with ZTF J1901+1458.” Physical
Review D, vol. 107, no. 10, L101303, American Physical Society, 2023, doi:10.1103/physrevd.107.l101303.
short: L. Fleury, I. Caiazzo, J. Heyl, Physical Review D 107 (2023).
date_created: 2024-03-26T09:48:05Z
date_published: 2023-05-17T00:00:00Z
date_updated: 2024-04-02T07:11:34Z
day: '17'
doi: 10.1103/physrevd.107.l101303
extern: '1'
external_id:
arxiv:
- '2208.00405'
intvolume: ' 107'
issue: '10'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2208.00405
month: '05'
oa: 1
oa_version: Preprint
publication: Physical Review D
publication_identifier:
eissn:
- 2470-0029
issn:
- 2470-0010
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Constraining axions with ZTF J1901+1458
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 107
year: '2023'
...
---
_id: '15199'
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.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Leesa
full_name: Fleury, Leesa
last_name: Fleury
- first_name: Ilaria
full_name: Caiazzo, Ilaria
id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
last_name: Caiazzo
orcid: 0000-0002-4770-5388
- first_name: Jeremy
full_name: Heyl, Jeremy
last_name: Heyl
citation:
ama: 'Fleury L, Caiazzo I, Heyl J. The origin of ultramassive white dwarfs: hints
from Gaia EDR3. Monthly Notices of the Royal Astronomical Society.
2023;520(1):364-374. doi:10.1093/mnras/stad068'
apa: 'Fleury, L., Caiazzo, I., & Heyl, J. (2023). The origin of ultramassive
white dwarfs: hints from Gaia EDR3. Monthly Notices of the Royal Astronomical
Society. Oxford University Press. https://doi.org/10.1093/mnras/stad068'
chicago: 'Fleury, Leesa, Ilaria Caiazzo, and Jeremy Heyl. “The Origin of Ultramassive
White Dwarfs: Hints from Gaia EDR3.” Monthly Notices of the Royal Astronomical
Society. Oxford University Press, 2023. https://doi.org/10.1093/mnras/stad068.'
ieee: 'L. Fleury, I. Caiazzo, and J. Heyl, “The origin of ultramassive white dwarfs:
hints from Gaia EDR3,” Monthly Notices of the Royal Astronomical Society,
vol. 520, no. 1. Oxford University Press, pp. 364–374, 2023.'
ista: 'Fleury L, Caiazzo I, Heyl J. 2023. The origin of ultramassive white dwarfs:
hints from Gaia EDR3. Monthly Notices of the Royal Astronomical Society.
520(1), 364–374.'
mla: 'Fleury, Leesa, et al. “The Origin of Ultramassive White Dwarfs: Hints from
Gaia EDR3.” Monthly Notices of the Royal Astronomical Society, vol.
520, no. 1, Oxford University Press, 2023, pp. 364–74, doi:10.1093/mnras/stad068.'
short: L. Fleury, I. Caiazzo, J. Heyl, Monthly Notices of the Royal Astronomical
Society 520 (2023) 364–374.
date_created: 2024-03-26T09:48:27Z
date_published: 2023-01-12T00:00:00Z
date_updated: 2024-04-02T07:13:10Z
day: '12'
doi: 10.1093/mnras/stad068
extern: '1'
external_id:
arxiv:
- '2205.01015'
intvolume: ' 520'
issue: '1'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2205.01015
month: '01'
oa: 1
oa_version: Preprint
page: 364-374
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
eissn:
- 1365-2966
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'The origin of ultramassive white dwarfs: hints from Gaia EDR3'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 520
year: '2023'
...
---
_id: '15200'
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.
article_number: '141'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Antonio C.
full_name: Rodriguez, Antonio C.
last_name: Rodriguez
- first_name: Shrinivas R.
full_name: Kulkarni, Shrinivas R.
last_name: Kulkarni
- first_name: Thomas A.
full_name: Prince, Thomas A.
last_name: Prince
- first_name: Paula
full_name: Szkody, Paula
last_name: Szkody
- first_name: Kevin B.
full_name: Burdge, Kevin B.
last_name: Burdge
- first_name: Ilaria
full_name: Caiazzo, Ilaria
id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
last_name: Caiazzo
orcid: 0000-0002-4770-5388
- first_name: Jan
full_name: van Roestel, Jan
last_name: van Roestel
- first_name: Zachary P.
full_name: Vanderbosch, Zachary P.
last_name: Vanderbosch
- first_name: Kareem
full_name: El-Badry, Kareem
last_name: El-Badry
- first_name: Eric C.
full_name: Bellm, Eric C.
last_name: Bellm
- first_name: Boris T.
full_name: Gänsicke, Boris T.
last_name: Gänsicke
- first_name: Matthew J.
full_name: Graham, Matthew J.
last_name: Graham
- first_name: Ashish A.
full_name: Mahabal, Ashish A.
last_name: Mahabal
- first_name: Frank J.
full_name: Masci, Frank J.
last_name: Masci
- first_name: Przemek
full_name: Mróz, Przemek
last_name: Mróz
- first_name: Reed
full_name: Riddle, Reed
last_name: Riddle
- first_name: Ben
full_name: Rusholme, Ben
last_name: Rusholme
citation:
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. The Astrophysical Journal.
2023;945(2). doi:10.3847/1538-4357/acbb6f
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. The Astrophysical Journal. American
Astronomical Society. https://doi.org/10.3847/1538-4357/acbb6f
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.” The Astrophysical
Journal. American Astronomical Society, 2023. https://doi.org/10.3847/1538-4357/acbb6f.
ieee: A. C. Rodriguez et al., “Discovery of two polars from a crossmatch
of ZTF and the SRG/eFEDS x-ray catalog,” The Astrophysical Journal, vol.
945, no. 2. American Astronomical Society, 2023.
ista: Rodriguez AC, Kulkarni SR, Prince TA, Szkody P, Burdge KB, Caiazzo I, van
Roestel J, Vanderbosch ZP, El-Badry K, Bellm EC, Gänsicke BT, Graham MJ, Mahabal
AA, Masci FJ, Mróz P, Riddle R, Rusholme B. 2023. Discovery of two polars from
a crossmatch of ZTF and the SRG/eFEDS x-ray catalog. The Astrophysical Journal.
945(2), 141.
mla: Rodriguez, Antonio C., et al. “Discovery of Two Polars from a Crossmatch of
ZTF and the SRG/EFEDS x-Ray Catalog.” The Astrophysical Journal, vol. 945,
no. 2, 141, American Astronomical Society, 2023, doi:10.3847/1538-4357/acbb6f.
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).
date_created: 2024-03-26T09:48:51Z
date_published: 2023-03-15T00:00:00Z
date_updated: 2024-04-02T07:13:55Z
day: '15'
doi: 10.3847/1538-4357/acbb6f
extern: '1'
external_id:
arxiv:
- '2206.04714'
intvolume: ' 945'
issue: '2'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3847/1538-4357/acbb6f
month: '03'
oa: 1
oa_version: Published Version
publication: The Astrophysical Journal
publication_identifier:
eissn:
- 1538-4357
issn:
- 0004-637X
publication_status: published
publisher: American Astronomical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Discovery of two polars from a crossmatch of ZTF and the SRG/eFEDS x-ray catalog
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 945
year: '2023'
...
---
_id: '15201'
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."
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Denis
full_name: González-Caniulef, Denis
last_name: González-Caniulef
- first_name: Ilaria
full_name: Caiazzo, Ilaria
id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
last_name: Caiazzo
orcid: 0000-0002-4770-5388
- first_name: Jeremy
full_name: Heyl, Jeremy
last_name: Heyl
citation:
ama: González-Caniulef D, Caiazzo I, Heyl J. Unbinned likelihood analysis for X-ray
polarization. Monthly Notices of the Royal Astronomical Society. 2023;519(4):5902-5912.
doi:10.1093/mnras/stad033
apa: González-Caniulef, D., Caiazzo, I., & Heyl, J. (2023). Unbinned likelihood
analysis for X-ray polarization. Monthly Notices of the Royal Astronomical
Society. Oxford University Press. https://doi.org/10.1093/mnras/stad033
chicago: González-Caniulef, Denis, Ilaria Caiazzo, and Jeremy Heyl. “Unbinned Likelihood
Analysis for X-Ray Polarization.” Monthly Notices of the Royal Astronomical
Society. Oxford University Press, 2023. https://doi.org/10.1093/mnras/stad033.
ieee: D. González-Caniulef, I. Caiazzo, and J. Heyl, “Unbinned likelihood analysis
for X-ray polarization,” Monthly Notices of the Royal Astronomical Society,
vol. 519, no. 4. Oxford University Press, pp. 5902–5912, 2023.
ista: González-Caniulef D, Caiazzo I, Heyl J. 2023. Unbinned likelihood analysis
for X-ray polarization. Monthly Notices of the Royal Astronomical Society. 519(4),
5902–5912.
mla: González-Caniulef, Denis, et al. “Unbinned Likelihood Analysis for X-Ray Polarization.”
Monthly Notices of the Royal Astronomical Society, vol. 519, no. 4, Oxford
University Press, 2023, pp. 5902–12, doi:10.1093/mnras/stad033.
short: D. González-Caniulef, I. Caiazzo, J. Heyl, Monthly Notices of the Royal Astronomical
Society 519 (2023) 5902–5912.
date_created: 2024-03-26T09:49:52Z
date_published: 2023-01-16T00:00:00Z
date_updated: 2024-04-02T07:14:49Z
day: '16'
doi: 10.1093/mnras/stad033
extern: '1'
external_id:
arxiv:
- '2204.00140'
intvolume: ' 519'
issue: '4'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2204.00140
month: '01'
oa: 1
oa_version: Preprint
page: 5902-5912
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
eissn:
- 1365-2966
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Unbinned likelihood analysis for X-ray polarization
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 519
year: '2023'
...
---
_id: '15202'
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.
article_number: L27
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Silvia
full_name: Zane, Silvia
last_name: Zane
- first_name: Roberto
full_name: Taverna, Roberto
last_name: Taverna
- first_name: Denis
full_name: González–Caniulef, Denis
last_name: González–Caniulef
- first_name: Fabio
full_name: Muleri, Fabio
last_name: Muleri
- first_name: Roberto
full_name: Turolla, Roberto
last_name: Turolla
- first_name: Jeremy
full_name: Heyl, Jeremy
last_name: Heyl
- first_name: Keisuke
full_name: Uchiyama, Keisuke
last_name: Uchiyama
- first_name: Mason
full_name: Ng, Mason
last_name: Ng
- first_name: Toru
full_name: Tamagawa, Toru
last_name: Tamagawa
- first_name: Ilaria
full_name: Caiazzo, Ilaria
id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
last_name: Caiazzo
orcid: 0000-0002-4770-5388
- first_name: Niccolò
full_name: Di Lalla, Niccolò
last_name: Di Lalla
- first_name: Herman L.
full_name: Marshall, Herman L.
last_name: Marshall
- first_name: Matteo
full_name: Bachetti, Matteo
last_name: Bachetti
- first_name: Fabio
full_name: La Monaca, Fabio
last_name: La Monaca
- first_name: Ephraim
full_name: Gau, Ephraim
last_name: Gau
- first_name: Alessandro
full_name: Di Marco, Alessandro
last_name: Di Marco
- first_name: Luca
full_name: Baldini, Luca
last_name: Baldini
- first_name: Michela
full_name: Negro, Michela
last_name: Negro
- first_name: Nicola
full_name: Omodei, Nicola
last_name: Omodei
- first_name: John
full_name: Rankin, John
last_name: Rankin
- first_name: Giorgio
full_name: Matt, Giorgio
last_name: Matt
- first_name: George G.
full_name: Pavlov, George G.
last_name: Pavlov
- first_name: Takao
full_name: Kitaguchi, Takao
last_name: Kitaguchi
- first_name: Henric
full_name: Krawczynski, Henric
last_name: Krawczynski
- first_name: Fabian
full_name: Kislat, Fabian
last_name: Kislat
- first_name: Ruth
full_name: Kelly, Ruth
last_name: Kelly
- first_name: Iván
full_name: Agudo, Iván
last_name: Agudo
- first_name: Lucio A.
full_name: Antonelli, Lucio A.
last_name: Antonelli
- first_name: Wayne H.
full_name: Baumgartner, Wayne H.
last_name: Baumgartner
- first_name: Ronaldo
full_name: Bellazzini, Ronaldo
last_name: Bellazzini
- first_name: Stefano
full_name: Bianchi, Stefano
last_name: Bianchi
- first_name: Stephen D.
full_name: Bongiorno, Stephen D.
last_name: Bongiorno
- first_name: Raffaella
full_name: Bonino, Raffaella
last_name: Bonino
- first_name: Alessandro
full_name: Brez, Alessandro
last_name: Brez
- first_name: Niccolò
full_name: Bucciantini, Niccolò
last_name: Bucciantini
- first_name: Fiamma
full_name: Capitanio, Fiamma
last_name: Capitanio
- first_name: Simone
full_name: Castellano, Simone
last_name: Castellano
- first_name: Elisabetta
full_name: Cavazzuti, Elisabetta
last_name: Cavazzuti
- first_name: Chieng-Ting
full_name: Chen, Chieng-Ting
last_name: Chen
- first_name: Stefano
full_name: Ciprini, Stefano
last_name: Ciprini
- first_name: Enrico
full_name: Costa, Enrico
last_name: Costa
- first_name: Alessandra
full_name: De Rosa, Alessandra
last_name: De Rosa
- first_name: Ettore
full_name: Del Monte, Ettore
last_name: Del Monte
- first_name: Laura
full_name: Di Gesu, Laura
last_name: Di Gesu
- first_name: Immacolata
full_name: Donnarumma, Immacolata
last_name: Donnarumma
- first_name: Victor
full_name: Doroshenko, Victor
last_name: Doroshenko
- first_name: Michal
full_name: Dovčiak, Michal
last_name: Dovčiak
- first_name: Steven R.
full_name: Ehlert, Steven R.
last_name: Ehlert
- first_name: Teruaki
full_name: Enoto, Teruaki
last_name: Enoto
- first_name: Yuri
full_name: Evangelista, Yuri
last_name: Evangelista
- first_name: Sergio
full_name: Fabiani, Sergio
last_name: Fabiani
- first_name: Riccardo
full_name: Ferrazzoli, Riccardo
last_name: Ferrazzoli
- first_name: Javier A.
full_name: Garcia, Javier A.
last_name: Garcia
- first_name: Shuichi
full_name: Gunji, Shuichi
last_name: Gunji
- first_name: Kiyoshi
full_name: Hayashida, Kiyoshi
last_name: Hayashida
- first_name: Wataru
full_name: Iwakiri, Wataru
last_name: Iwakiri
- first_name: Svetlana G.
full_name: Jorstad, Svetlana G.
last_name: Jorstad
- first_name: Philip
full_name: Kaaret, Philip
last_name: Kaaret
- first_name: Vladimir
full_name: Karas, Vladimir
last_name: Karas
- first_name: Jeffery J.
full_name: Kolodziejczak, Jeffery J.
last_name: Kolodziejczak
- first_name: Luca
full_name: Latronico, Luca
last_name: Latronico
- first_name: Ioannis
full_name: Liodakis, Ioannis
last_name: Liodakis
- first_name: Simone
full_name: Maldera, Simone
last_name: Maldera
- first_name: Alberto
full_name: Manfreda, Alberto
last_name: Manfreda
- first_name: Frédéric
full_name: Marin, Frédéric
last_name: Marin
- first_name: Andrea
full_name: Marinucci, Andrea
last_name: Marinucci
- first_name: Alan P.
full_name: Marscher, Alan P.
last_name: Marscher
- first_name: Francesco
full_name: Massaro, Francesco
last_name: Massaro
- first_name: Ikuyuki
full_name: Mitsuishi, Ikuyuki
last_name: Mitsuishi
- first_name: Tsunefumi
full_name: Mizuno, Tsunefumi
last_name: Mizuno
- first_name: C.-Y.
full_name: Ng, C.-Y.
last_name: Ng
- first_name: Stephen L.
full_name: O’Dell, Stephen L.
last_name: O’Dell
- first_name: Chiara
full_name: Oppedisano, Chiara
last_name: Oppedisano
- first_name: Alessandro
full_name: Papitto, Alessandro
last_name: Papitto
- first_name: Abel L.
full_name: Peirson, Abel L.
last_name: Peirson
- first_name: Matteo
full_name: Perri, Matteo
last_name: Perri
- first_name: Melissa
full_name: Pesce-Rollins, Melissa
last_name: Pesce-Rollins
- first_name: Pierre-Olivier
full_name: Petrucci, Pierre-Olivier
last_name: Petrucci
- first_name: Maura
full_name: Pilia, Maura
last_name: Pilia
- first_name: Andrea
full_name: Possenti, Andrea
last_name: Possenti
- first_name: Juri
full_name: Poutanen, Juri
last_name: Poutanen
- first_name: Simonetta
full_name: Puccetti, Simonetta
last_name: Puccetti
- first_name: Brian D.
full_name: Ramsey, Brian D.
last_name: Ramsey
- first_name: Ajay
full_name: Ratheesh, Ajay
last_name: Ratheesh
- first_name: Oliver J.
full_name: Roberts, Oliver J.
last_name: Roberts
- first_name: Roger W.
full_name: Romani, Roger W.
last_name: Romani
- first_name: Carmelo
full_name: Sgró, Carmelo
last_name: Sgró
- first_name: Patrick
full_name: Slane, Patrick
last_name: Slane
- first_name: Paolo
full_name: Soffitta, Paolo
last_name: Soffitta
- first_name: Gloria
full_name: Spandre, Gloria
last_name: Spandre
- first_name: Douglas A.
full_name: Swartz, Douglas A.
last_name: Swartz
- first_name: Fabrizio
full_name: Tavecchio, Fabrizio
last_name: Tavecchio
- first_name: Yuzuru
full_name: Tawara, Yuzuru
last_name: Tawara
- first_name: Allyn F.
full_name: Tennant, Allyn F.
last_name: Tennant
- first_name: Nicholas E.
full_name: Thomas, Nicholas E.
last_name: Thomas
- first_name: Francesco
full_name: Tombesi, Francesco
last_name: Tombesi
- first_name: Alessio
full_name: Trois, Alessio
last_name: Trois
- first_name: Sergey S.
full_name: Tsygankov, Sergey S.
last_name: Tsygankov
- first_name: Jacco
full_name: Vink, Jacco
last_name: Vink
- first_name: Martin C.
full_name: Weisskopf, Martin C.
last_name: Weisskopf
- first_name: Kinwah
full_name: Wu, Kinwah
last_name: Wu
- first_name: Fei
full_name: Xie, Fei
last_name: Xie
citation:
ama: Zane S, Taverna R, González–Caniulef D, et al. A strong x-ray polarization
signal from the magnetar 1RXS J170849.0-400910. The Astrophysical Journal Letters.
2023;944(2). doi:10.3847/2041-8213/acb703
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. The Astrophysical Journal Letters. American Astronomical
Society. https://doi.org/10.3847/2041-8213/acb703
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.” The Astrophysical Journal Letters.
American Astronomical Society, 2023. https://doi.org/10.3847/2041-8213/acb703.
ieee: S. Zane et al., “A strong x-ray polarization signal from the magnetar
1RXS J170849.0-400910,” The Astrophysical Journal Letters, vol. 944, no.
2. American Astronomical Society, 2023.
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.
mla: Zane, Silvia, et al. “A Strong X-Ray Polarization Signal from the Magnetar
1RXS J170849.0-400910.” The Astrophysical Journal Letters, vol. 944, no.
2, L27, American Astronomical Society, 2023, doi:10.3847/2041-8213/acb703.
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).
date_created: 2024-03-26T09:50:12Z
date_published: 2023-02-15T00:00:00Z
date_updated: 2024-04-02T07:15:41Z
day: '15'
doi: 10.3847/2041-8213/acb703
extern: '1'
external_id:
arxiv:
- '2301.12919'
intvolume: ' 944'
issue: '2'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3847/2041-8213/acb703
month: '02'
oa: 1
oa_version: Published Version
publication: The Astrophysical Journal Letters
publication_identifier:
eissn:
- 2041-8213
issn:
- 2041-8205
publication_status: published
publisher: American Astronomical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: A strong x-ray polarization signal from the magnetar 1RXS J170849.0-400910
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 944
year: '2023'
...
---
_id: '15225'
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.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Jeremy
full_name: Heyl, Jeremy
last_name: Heyl
- first_name: Ilaria
full_name: Caiazzo, Ilaria
id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
last_name: Caiazzo
orcid: 0000-0002-4770-5388
- first_name: Denis
full_name: González-Caniulef, Denis
last_name: González-Caniulef
citation:
ama: Heyl J, Caiazzo I, González-Caniulef D. X-ray polarization at the crossroads.
Proceedings of the International Astronomical Union. 2023;16(S363):80-91.
doi:10.1017/s1743921322000916
apa: Heyl, J., Caiazzo, I., & González-Caniulef, D. (2023). X-ray polarization
at the crossroads. Proceedings of the International Astronomical Union.
Cambridge University Press. https://doi.org/10.1017/s1743921322000916
chicago: Heyl, Jeremy, Ilaria Caiazzo, and Denis González-Caniulef. “X-Ray Polarization
at the Crossroads.” Proceedings of the International Astronomical Union.
Cambridge University Press, 2023. https://doi.org/10.1017/s1743921322000916.
ieee: J. Heyl, I. Caiazzo, and D. González-Caniulef, “X-ray polarization at the
crossroads,” Proceedings of the International Astronomical Union, vol.
16, no. S363. Cambridge University Press, pp. 80–91, 2023.
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.” Proceedings
of the International Astronomical Union, vol. 16, no. S363, Cambridge University
Press, 2023, pp. 80–91, doi:10.1017/s1743921322000916.
short: J. Heyl, I. Caiazzo, D. González-Caniulef, Proceedings of the International
Astronomical Union 16 (2023) 80–91.
date_created: 2024-03-26T10:35:20Z
date_published: 2023-02-27T00:00:00Z
date_updated: 2024-04-04T09:46:17Z
day: '27'
doi: 10.1017/s1743921322000916
extern: '1'
external_id:
arxiv:
- '2203.09066'
intvolume: ' 16'
issue: S363
keyword:
- Astronomy and Astrophysics
- Space and Planetary Science
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1017/S1743921322000916
month: '02'
oa: 1
oa_version: Published Version
page: 80-91
publication: Proceedings of the International Astronomical Union
publication_identifier:
eissn:
- 1743-9221
issn:
- 1743-9213
publication_status: published
publisher: Cambridge University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: X-ray polarization at the crossroads
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 16
year: '2023'
...
---
_id: '15226'
abstract:
- lang: eng
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"
article_processing_charge: No
article_type: original
author:
- first_name: Denis
full_name: González-Caniulef, Denis
last_name: González-Caniulef
- first_name: Ilaria
full_name: Caiazzo, Ilaria
id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
last_name: Caiazzo
orcid: 0000-0002-4770-5388
- first_name: Jeremy
full_name: Heyl, Jeremy
last_name: Heyl
citation:
ama: González-Caniulef D, Caiazzo I, Heyl J. IXPE simulations for magnetars. Proceedings
of the International Astronomical Union. 2023;16(S363):314-317. doi:10.1017/s1743921322000679
apa: González-Caniulef, D., Caiazzo, I., & Heyl, J. (2023). IXPE simulations
for magnetars. Proceedings of the International Astronomical Union. Cambridge
University Press. https://doi.org/10.1017/s1743921322000679
chicago: González-Caniulef, Denis, Ilaria Caiazzo, and Jeremy Heyl. “IXPE Simulations
for Magnetars.” Proceedings of the International Astronomical Union. Cambridge
University Press, 2023. https://doi.org/10.1017/s1743921322000679.
ieee: D. González-Caniulef, I. Caiazzo, and J. Heyl, “IXPE simulations for magnetars,”
Proceedings of the International Astronomical Union, vol. 16, no. S363.
Cambridge University Press, pp. 314–317, 2023.
ista: González-Caniulef D, Caiazzo I, Heyl J. 2023. IXPE simulations for magnetars.
Proceedings of the International Astronomical Union. 16(S363), 314–317.
mla: González-Caniulef, Denis, et al. “IXPE Simulations for Magnetars.” Proceedings
of the International Astronomical Union, vol. 16, no. S363, Cambridge University
Press, 2023, pp. 314–17, doi:10.1017/s1743921322000679.
short: D. González-Caniulef, I. Caiazzo, J. Heyl, Proceedings of the International
Astronomical Union 16 (2023) 314–317.
date_created: 2024-03-26T10:35:43Z
date_published: 2023-02-27T00:00:00Z
date_updated: 2024-04-04T12:54:59Z
day: '27'
doi: 10.1017/s1743921322000679
extern: '1'
intvolume: ' 16'
issue: S363
keyword:
- Astronomy and Astrophysics
- Space and Planetary Science
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1017/S1743921322000679
month: '02'
oa: 1
oa_version: Published Version
page: 314-317
publication: Proceedings of the International Astronomical Union
publication_identifier:
eissn:
- 1743-9221
issn:
- 1743-9213
publication_status: published
publisher: Cambridge University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: IXPE simulations for magnetars
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 16
year: '2023'
...
---
_id: '15292'
abstract:
- lang: eng
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.
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)
article_processing_charge: No
author:
- first_name: Yi-Lu
full_name: Chen, Yi-Lu
id: 0b467602-dbcd-11ea-9d1d-ed480aa46b70
last_name: Chen
- first_name: Mickaël
full_name: Ly, Mickaël
id: 6340d7f0-b48d-11eb-b10d-b7487e71d9f1
last_name: Ly
- first_name: Christopher J
full_name: Wojtan, Christopher J
id: 3C61F1D2-F248-11E8-B48F-1D18A9856A87
last_name: Wojtan
orcid: 0000-0001-6646-5546
citation:
ama: Chen Y-L, Ly M, Wojtan C. Unified Treatment of Contact, Friction and Shock-Propagation
in Rigid Body Animation. ACM; 2023. doi:10.1145/3606037.3606836
apa: 'Chen, Y.-L., Ly, M., & Wojtan, C. (2023). Unified treatment of contact,
friction and shock-propagation in rigid body animation. Proceedings of
the ACM SIGGRAPH/Eurographics Symposium on Computer Animation. Los Angeles,
CA, United States: ACM. https://doi.org/10.1145/3606037.3606836'
chicago: Chen, Yi-Lu, Mickaël Ly, and Chris Wojtan. Unified Treatment of Contact,
Friction and Shock-Propagation in Rigid Body Animation. Proceedings of
the ACM SIGGRAPH/Eurographics Symposium on Computer Animation. ACM, 2023.
https://doi.org/10.1145/3606037.3606836.
ieee: Y.-L. Chen, M. Ly, and C. Wojtan, Unified treatment of contact, friction
and shock-propagation in rigid body animation. ACM, 2023.
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.” Proceedings of the ACM SIGGRAPH/Eurographics Symposium
on Computer Animation, ACM, 2023, doi:10.1145/3606037.3606836.
short: Y.-L. Chen, M. Ly, C. Wojtan, Unified Treatment of Contact, Friction and
Shock-Propagation in Rigid Body Animation, ACM, 2023.
conference:
end_date: 2023-08-06
location: Los Angeles, CA, United States
name: 'SCA: Symposium on Computer Animation'
start_date: 2023-08-04
corr_author: '1'
date_created: 2024-04-03T14:57:23Z
date_published: 2023-08-01T00:00:00Z
date_updated: 2025-04-14T12:58:27Z
day: '01'
ddc:
- '005'
- '531'
department:
- _id: GradSch
- _id: ChWo
doi: 10.1145/3606037.3606836
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creator: yichen
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date_updated: 2024-04-03T14:58:23Z
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file_name: frictionPoster_clean.pdf
file_size: 3951968
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language:
- iso: eng
month: '08'
oa: 1
oa_version: None
project:
- _id: 34bc2376-11ca-11ed-8bc3-9a3b3961a088
grant_number: '101045083'
name: Computational Discovery of Numerical Algorithms for Animation and Simulation
of Natural Phenomena
publication: Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation
publication_status: published
publisher: ACM
related_material:
record:
- id: '14748'
relation: other
status: public
status: public
title: Unified treatment of contact, friction and shock-propagation in rigid body
animation
type: conference_poster
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2023'
...
---
_id: '15363'
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.
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."
alternative_title:
- NeurIPS
article_processing_charge: Yes
arxiv: 1
author:
- first_name: Mher
full_name: Safaryan, Mher
id: dd546b39-0804-11ed-9c55-ef075c39778d
last_name: Safaryan
- first_name: Elena-Alexandra
full_name: Peste, Elena-Alexandra
id: 32D78294-F248-11E8-B48F-1D18A9856A87
last_name: Peste
- first_name: Dan-Adrian
full_name: Alistarh, Dan-Adrian
id: 4A899BFC-F248-11E8-B48F-1D18A9856A87
last_name: Alistarh
orcid: 0000-0003-3650-940X
citation:
ama: 'Safaryan M, Krumes A, Alistarh D-A. Knowledge distillation performs partial
variance reduction. In: 36th Conference on Neural Information Processing Systems.
Vol 36. ; 2023.'
apa: Safaryan, M., Krumes, A., & Alistarh, D.-A. (2023). Knowledge distillation
performs partial variance reduction. In 36th Conference on Neural Information
Processing Systems (Vol. 36). New Orleans, LA, United States.
chicago: Safaryan, Mher, Alexandra Krumes, and Dan-Adrian Alistarh. “Knowledge Distillation
Performs Partial Variance Reduction.” In 36th Conference on Neural Information
Processing Systems, Vol. 36, 2023.
ieee: M. Safaryan, A. Krumes, and D.-A. Alistarh, “Knowledge distillation performs
partial variance reduction,” in 36th Conference on Neural Information Processing
Systems, New Orleans, LA, United States, 2023, vol. 36.
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.'
mla: Safaryan, Mher, et al. “Knowledge Distillation Performs Partial Variance Reduction.”
36th Conference on Neural Information Processing Systems, vol. 36, 2023.
short: M. Safaryan, A. Krumes, D.-A. Alistarh, in:, 36th Conference on Neural Information
Processing Systems, 2023.
conference:
end_date: 2023-12-16
location: New Orleans, LA, United States
name: 'NeurIPS: Neural Information Processing Systems'
start_date: 2023-12-10
corr_author: '1'
date_created: 2024-05-05T22:01:04Z
date_published: 2023-12-15T00:00:00Z
date_updated: 2025-04-14T07:54:55Z
day: '15'
ddc:
- '000'
department:
- _id: DaAl
ec_funded: 1
external_id:
arxiv:
- '2305.17581'
file:
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creator: dernst
date_created: 2024-05-22T08:08:08Z
date_updated: 2024-05-22T08:08:08Z
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file_date_updated: 2024-05-22T08:08:08Z
has_accepted_license: '1'
intvolume: ' 36'
language:
- iso: eng
month: '12'
oa: 1
oa_version: Published Version
project:
- _id: fc2ed2f7-9c52-11eb-aca3-c01059dda49c
call_identifier: H2020
grant_number: '101034413'
name: 'IST-BRIDGE: International postdoctoral program'
publication: 36th Conference on Neural Information Processing Systems
publication_identifier:
issn:
- 1049-5258
publication_status: published
quality_controlled: '1'
scopus_import: '1'
status: public
title: Knowledge distillation performs partial variance reduction
tmp:
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legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 36
year: '2023'
...