White dwarf–main-sequence binaries from Gaia EDR3: the unresolved 100 pc volume-limited sample

We use the data provided by the Gaia Early Data Release 3 to search for a highly-complete volume-limited sample of unresolved binaries consisting of a white dwarf and a main sequence companion (i.e. WDMS binaries) within 100pc. We select 112 objects based on their location within the Hertzsprung-Rus...

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Autores principales: Rebassa Mansergas, Alberto, Solano, Enrique, Jiménez Esteban, F. M., Torres, Santiago Hernán, Rodrigo, Carlos, Ferrer Burjachs, A, Calcaferro, Leila Magdalena, Althaus, Leandro Gabriel, Córsico, Alejandro Hugo
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2021
Materias:
Astronomía
(stars:) white dwarfs
(stars:) binaries (including multiple): close
virtual observatory tools
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/139127
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-139127
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Astronomía
(stars:) white dwarfs
(stars:) binaries (including multiple): close
virtual observatory tools
spellingShingle Astronomía
(stars:) white dwarfs
(stars:) binaries (including multiple): close
virtual observatory tools
Rebassa Mansergas, Alberto
Solano, Enrique
Jiménez Esteban, F. M.
Torres, Santiago Hernán
Rodrigo, Carlos
Ferrer Burjachs, A
Calcaferro, Leila Magdalena
Althaus, Leandro Gabriel
Córsico, Alejandro Hugo
White dwarf–main-sequence binaries from Gaia EDR3: the unresolved 100 pc volume-limited sample
topic_facet Astronomía
(stars:) white dwarfs
(stars:) binaries (including multiple): close
virtual observatory tools
description We use the data provided by the Gaia Early Data Release 3 to search for a highly-complete volume-limited sample of unresolved binaries consisting of a white dwarf and a main sequence companion (i.e. WDMS binaries) within 100pc. We select 112 objects based on their location within the Hertzsprung-Russell diagram, of which 97 are new identifications. We fit their spectral energy distributions (SED) with a two-body fitting algorithm implemented in VOSA (Virtual Observatory SED Analyser) to derive the effective temperatures, luminosities and radii (hence surface gravities and masses) of both components. The stellar parameters are compared to those from the currently largest catalogue of close WDMS binaries, from the Sloan Digital Sky Survey (SDSS). We find important differences between the properties of the Gaia and SDSS samples. In particular, the Gaia sample contains WDMS binaries with considerably cooler white dwarfs and main sequence companions (some expected to be brown dwarfs). The Gaia sample also shows an important population of systems consisting of cool and extremely low-mass white dwarfs, not present in the SDSS sample. Finally, using a Monte Carlo population synthesis code, we find that the volume-limited sample of systems identified here seems to be highly complete (~80+-9 per cent), however it only represents ~9 per cent of the total underlying population. The missing ~91 per cent includes systems in which the main sequence companions entirely dominate the SEDs. We also estimate an upper limit to the total space density of close WDMS binaries of ~(3.7+-1.9)x10^{-4} pc{-3}.
format Articulo
Preprint
author Rebassa Mansergas, Alberto
Solano, Enrique
Jiménez Esteban, F. M.
Torres, Santiago Hernán
Rodrigo, Carlos
Ferrer Burjachs, A
Calcaferro, Leila Magdalena
Althaus, Leandro Gabriel
Córsico, Alejandro Hugo
author_facet Rebassa Mansergas, Alberto
Solano, Enrique
Jiménez Esteban, F. M.
Torres, Santiago Hernán
Rodrigo, Carlos
Ferrer Burjachs, A
Calcaferro, Leila Magdalena
Althaus, Leandro Gabriel
Córsico, Alejandro Hugo
author_sort Rebassa Mansergas, Alberto
title White dwarf–main-sequence binaries from Gaia EDR3: the unresolved 100 pc volume-limited sample
title_short White dwarf–main-sequence binaries from Gaia EDR3: the unresolved 100 pc volume-limited sample
title_full White dwarf–main-sequence binaries from Gaia EDR3: the unresolved 100 pc volume-limited sample
title_fullStr White dwarf–main-sequence binaries from Gaia EDR3: the unresolved 100 pc volume-limited sample
title_full_unstemmed White dwarf–main-sequence binaries from Gaia EDR3: the unresolved 100 pc volume-limited sample
title_sort white dwarf–main-sequence binaries from gaia edr3: the unresolved 100 pc volume-limited sample
publishDate 2021
url http://sedici.unlp.edu.ar/handle/10915/139127
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