High-resolution smoothed particle hydrodynamics simulations of the merger of binary white dwarfs
Context. The coalescence of two white dwarfs is the final outcome of a sizeable fraction of binary stellar systems. Moreover, this process has been proposed to explain several interesting astrophysical phenomena. Aims. We present the results of a set of high-resolution simulations of the merging pro...
| Autores: | , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2009 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/24914 |
| Acceso en línea: | https://hdl.handle.net/2117/24914 https://dx.doi.org/10.1051/0004-6361/200811060 |
| Access Level: | acceso abierto |
| Palabra clave: | White dwarf stars stars: white dwarfs — stars: interiors — stars: binaries: close — hydrodynamics — methods: numerical — accretion: accretion disks Estels nans Àrees temàtiques de la UPC::Física::Astronomia i astrofísica |
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High-resolution smoothed particle hydrodynamics simulations of the merger of binary white dwarfsLorén Aguilar, PabloIsern Vilaboy, JordiGarcía-Berro Montilla, Enrique|||0000-0002-1623-5838White dwarf starsstars: white dwarfs — stars: interiors — stars: binaries: close — hydrodynamics — methods: numerical — accretion: accretion disksEstels nansÀrees temàtiques de la UPC::Física::Astronomia i astrofísicaContext. The coalescence of two white dwarfs is the final outcome of a sizeable fraction of binary stellar systems. Moreover, this process has been proposed to explain several interesting astrophysical phenomena. Aims. We present the results of a set of high-resolution simulations of the merging process of two white dwarfs. Methods. We use an up-to-date Smoothed Particle Hydrodynamics code which incorporates very detailed input physics and an improved treatment of the artificial viscosity. Our simulations have been done using a large number of particles (~ 4 × 105 ) and cover the full range of masses and chemical compositions of the coalescing white dwarfs. We also compare the time evolution of the system during the first phases of the coalescence with that obtained using a simplified treatment of mass transfer, we discuss in detail the characteristics of the final configuration, we assess the possible observational signatures of the merger, like the associated gravitational waveforms and the fallback X-ray flares, and we study the long-term evolution of the coalescence. Results. The mass transfer rates obtained during the first phases of the merger episode are in agreement the theoretical expectations. In all the cases studied the merged configuration is a central compact object surrounded by a self-gravitating keplerian disk, except in the case in which two equal-mass white dwarfs coalesce. Conclusions. We find that the overall evolution the system and the main characteristics of the of the final object are in agreement with other previous studies in which smaller resolutions were used. We also find the the fallback X-ray luminosities are of the order of 1047 erg/s. The gravitational waveforms are characterized by the sudden dissapearance of the signal in a few orbital periods.Peer Reviewed20092009-06-0120142014-12-03journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/24914https://dx.doi.org/10.1051/0004-6361/200811060reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/249142026-05-27T15:37:01Z |
| dc.title.none.fl_str_mv |
High-resolution smoothed particle hydrodynamics simulations of the merger of binary white dwarfs |
| title |
High-resolution smoothed particle hydrodynamics simulations of the merger of binary white dwarfs |
| spellingShingle |
High-resolution smoothed particle hydrodynamics simulations of the merger of binary white dwarfs Lorén Aguilar, Pablo White dwarf stars stars: white dwarfs — stars: interiors — stars: binaries: close — hydrodynamics — methods: numerical — accretion: accretion disks Estels nans Àrees temàtiques de la UPC::Física::Astronomia i astrofísica |
| title_short |
High-resolution smoothed particle hydrodynamics simulations of the merger of binary white dwarfs |
| title_full |
High-resolution smoothed particle hydrodynamics simulations of the merger of binary white dwarfs |
| title_fullStr |
High-resolution smoothed particle hydrodynamics simulations of the merger of binary white dwarfs |
| title_full_unstemmed |
High-resolution smoothed particle hydrodynamics simulations of the merger of binary white dwarfs |
| title_sort |
High-resolution smoothed particle hydrodynamics simulations of the merger of binary white dwarfs |
| dc.creator.none.fl_str_mv |
Lorén Aguilar, Pablo Isern Vilaboy, Jordi García-Berro Montilla, Enrique|||0000-0002-1623-5838 |
| author |
Lorén Aguilar, Pablo |
| author_facet |
Lorén Aguilar, Pablo Isern Vilaboy, Jordi García-Berro Montilla, Enrique|||0000-0002-1623-5838 |
| author_role |
author |
| author2 |
Isern Vilaboy, Jordi García-Berro Montilla, Enrique|||0000-0002-1623-5838 |
| author2_role |
author author |
| dc.subject.none.fl_str_mv |
White dwarf stars stars: white dwarfs — stars: interiors — stars: binaries: close — hydrodynamics — methods: numerical — accretion: accretion disks Estels nans Àrees temàtiques de la UPC::Física::Astronomia i astrofísica |
| topic |
White dwarf stars stars: white dwarfs — stars: interiors — stars: binaries: close — hydrodynamics — methods: numerical — accretion: accretion disks Estels nans Àrees temàtiques de la UPC::Física::Astronomia i astrofísica |
| description |
Context. The coalescence of two white dwarfs is the final outcome of a sizeable fraction of binary stellar systems. Moreover, this process has been proposed to explain several interesting astrophysical phenomena. Aims. We present the results of a set of high-resolution simulations of the merging process of two white dwarfs. Methods. We use an up-to-date Smoothed Particle Hydrodynamics code which incorporates very detailed input physics and an improved treatment of the artificial viscosity. Our simulations have been done using a large number of particles (~ 4 × 105 ) and cover the full range of masses and chemical compositions of the coalescing white dwarfs. We also compare the time evolution of the system during the first phases of the coalescence with that obtained using a simplified treatment of mass transfer, we discuss in detail the characteristics of the final configuration, we assess the possible observational signatures of the merger, like the associated gravitational waveforms and the fallback X-ray flares, and we study the long-term evolution of the coalescence. Results. The mass transfer rates obtained during the first phases of the merger episode are in agreement the theoretical expectations. In all the cases studied the merged configuration is a central compact object surrounded by a self-gravitating keplerian disk, except in the case in which two equal-mass white dwarfs coalesce. Conclusions. We find that the overall evolution the system and the main characteristics of the of the final object are in agreement with other previous studies in which smaller resolutions were used. We also find the the fallback X-ray luminosities are of the order of 1047 erg/s. The gravitational waveforms are characterized by the sudden dissapearance of the signal in a few orbital periods. |
| publishDate |
2009 |
| dc.date.none.fl_str_mv |
2009 2009-06-01 2014 2014-12-03 |
| dc.type.none.fl_str_mv |
journal article http://purl.org/coar/resource_type/c_6501 VoR http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
| format |
article |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/2117/24914 https://dx.doi.org/10.1051/0004-6361/200811060 |
| url |
https://hdl.handle.net/2117/24914 https://dx.doi.org/10.1051/0004-6361/200811060 |
| dc.language.none.fl_str_mv |
Inglés eng |
| language_invalid_str_mv |
Inglés |
| language |
eng |
| dc.rights.none.fl_str_mv |
open access http://purl.org/coar/access_right/c_abf2 |
| dc.rights.openaire.fl_str_mv |
info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
open access http://purl.org/coar/access_right/c_abf2 |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
application/pdf |
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reponame:UPCommons. Portal del coneixement obert de la UPC instname:Universitat Politècnica de Catalunya (UPC) |
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Universitat Politècnica de Catalunya (UPC) |
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UPCommons. Portal del coneixement obert de la UPC |
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UPCommons. Portal del coneixement obert de la UPC |
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15.301629 |