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dc.contributor.author
Hollands, M. A.
dc.contributor.author
Tremblay, P. E.
dc.contributor.author
Gänsicke, B. T.
dc.contributor.author
Camisassa, María Eugenia
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dc.contributor.author
Koester, D.
dc.contributor.author
Aungwerojwit, A.
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Chote, P.
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Corsico, Alejandro Hugo
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dc.contributor.author
Dhillon, V. S.
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Gentile Fusillo, N. P.
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Hoskin, M. J.
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Izquierdo, P.
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Marsh, T. R.
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Steeghs, D.
dc.date.available
2021-11-02T17:09:54Z
dc.date.issued
2020-03
dc.identifier.citation
Hollands, M. A.; Tremblay, P. E.; Gänsicke, B. T.; Camisassa, María Eugenia; Koester, D.; et al.; An ultra-massive white dwarf with a mixed hydrogen–carbon atmosphere as a likely merger remnant; Nature Publishing Group; Nature Astronomy; 4; 3-2020; 663–669
dc.identifier.uri
http://hdl.handle.net/11336/145761
dc.description.abstract
White dwarfs are dense, cooling stellar embers consisting mostly of carbon and oxygen, or oxygen and neon (with a few per cent carbon) at higher initial stellar masses. These stellar cores are enveloped by a shell of helium, which in turn, is usually surrounded by a layer of hydrogen, generally prohibiting direct observation of the interior composition. However, carbon is observed at the surface of a sizeable fraction of white dwarfs, sometimes with traces of oxygen, and is thought to be dredged up from the core by a deep helium convection zone. In these objects, only traces of hydrogen are found, as large masses of hydrogen are predicted to inhibit hydrogen-helium convective mixing within the envelope. We report the identification of WD J055134.612+413531.09, an ultra-massive (1.14 solar masses (M☉)) white dwarf with a unique carbon-hydrogen mixed atmosphere (atomic ratio C/H = 0.15). Our analysis of the envelope and interior indicates that the total hydrogen and helium mass fractions must be several orders of magnitude lower than predictions of single-star evolution: less than 10-9.5 and 10-7.0, respectively. Due to the fast kinematics (129 ± 5 km s-1 relative to the local standard of rest), large mass and peculiar envelope composition, we argue that WD J0551+4135 is consistent with formation from the merger of two white dwarfs in a tight binary system.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Nature Publishing Group
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Astrophysics
dc.subject
Solar and Stellar Astrophysics
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
An ultra-massive white dwarf with a mixed hydrogen–carbon atmosphere as a likely merger remnant
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-08-17T15:54:38Z
dc.identifier.eissn
2397-3366
dc.journal.number
4
dc.journal.pagination
663–669
dc.journal.pais
Reino Unido
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dc.description.fil
Fil: Hollands, M. A.. University of Warwick; Reino Unido
dc.description.fil
Fil: Tremblay, P. E.. University of Warwick; Reino Unido
dc.description.fil
Fil: Gänsicke, B. T.. University of Warwick; Reino Unido
dc.description.fil
Fil: Camisassa, María Eugenia. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
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Fil: Koester, D.. Christian Albrechts Universitat Zu Kiel.; Alemania
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Fil: Aungwerojwit, A.. Naresuan University; Tailandia
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Fil: Chote, P.. University of Warwick; Reino Unido
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Fil: Corsico, Alejandro Hugo. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
dc.description.fil
Fil: Dhillon, V. S.. University Of Sheffield; Reino Unido
dc.description.fil
Fil: Gentile Fusillo, N. P.. University of Warwick; Reino Unido
dc.description.fil
Fil: Hoskin, M. J.. University of Warwick; Reino Unido
dc.description.fil
Fil: Izquierdo, P.. Universidad de La Laguna; España
dc.description.fil
Fil: Marsh, T. R.. University of Warwick; Reino Unido
dc.description.fil
Fil: Steeghs, D.. University of Warwick; Reino Unido
dc.journal.title
Nature Astronomy
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.nature.com/articles/s41550-020-1028-0
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info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1038/s41550-020-1028-0
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/2003.00028#:~:text=28%20Feb%202020%5D-,An%20ultra%2Dmassive%20white%20dwarf%20with%20a%20mixed%20hydrogen%2Dcarbon,as%20a%20likely%20merger%20remnant&text=White%20dwarfs%20are%20dense%2C%20cooling,at%20higher%20initial%20stellar%20masses.
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