The DBL Survey I: discovery of 34 double-lined double white dwarf binaries
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arXiv
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| Auteurs principaux: | , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910946571583488 |
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| author | Munday, James Pelisoli, Ingrid Tremblay, P. E. Marsh, T. R. Nelemans, Gijs Bédard, Antoine Toonen, Silvia Breedt, Elmé Cunningham, Tim O'Brien, Mairi W. Dawson, Harry |
| author_facet | Munday, James Pelisoli, Ingrid Tremblay, P. E. Marsh, T. R. Nelemans, Gijs Bédard, Antoine Toonen, Silvia Breedt, Elmé Cunningham, Tim O'Brien, Mairi W. Dawson, Harry |
| contents | We present the first discoveries of the double-lined double white dwarf (DBL) survey that targets over-luminous sources with respect to the canonical white dwarf cooling sequence according to a set of well-defined criteria. The primary goal of the DBL survey is to identify compact double white dwarf binary star systems from a unique spectral detection of both stars, which then enables a precise quantification of the atmospheric parameters and radial velocity variability of a system. Our search of 117 candidates that were randomly selected from a magnitude limited sample of 399 yielded a 29% detection efficiency with 34 systems exhibiting a double-lined signature. A further 38 systems show strong evidence of being single-lined or potentially-double-lined double white dwarf binaries and 7 single-lined sources from the full observed sample are radial velocity variable. The 45 remaining candidates appear as a single WD with no companion or a non-DA white dwarf, bringing the efficiency of detecting binaries to 62%. Atmospheric fitting of all double-lined systems reveals a large fraction that have two similar mass components that combine to a total mass of 1.0-1.3 solar masses - a class of double white dwarf binaries that may undergo a sub-Chandrasekhar mass type Ia detonation or merge to form a massive O/Ne WD, although orbital periods are required to infer on which timescales. One double-lined system located 49pc away, WDJ181058.67+311940.94, is super-Chandrasekhar mass, making it the second such double white dwarf binary to be discovered. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_02594 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The DBL Survey I: discovery of 34 double-lined double white dwarf binaries Munday, James Pelisoli, Ingrid Tremblay, P. E. Marsh, T. R. Nelemans, Gijs Bédard, Antoine Toonen, Silvia Breedt, Elmé Cunningham, Tim O'Brien, Mairi W. Dawson, Harry Solar and Stellar Astrophysics We present the first discoveries of the double-lined double white dwarf (DBL) survey that targets over-luminous sources with respect to the canonical white dwarf cooling sequence according to a set of well-defined criteria. The primary goal of the DBL survey is to identify compact double white dwarf binary star systems from a unique spectral detection of both stars, which then enables a precise quantification of the atmospheric parameters and radial velocity variability of a system. Our search of 117 candidates that were randomly selected from a magnitude limited sample of 399 yielded a 29% detection efficiency with 34 systems exhibiting a double-lined signature. A further 38 systems show strong evidence of being single-lined or potentially-double-lined double white dwarf binaries and 7 single-lined sources from the full observed sample are radial velocity variable. The 45 remaining candidates appear as a single WD with no companion or a non-DA white dwarf, bringing the efficiency of detecting binaries to 62%. Atmospheric fitting of all double-lined systems reveals a large fraction that have two similar mass components that combine to a total mass of 1.0-1.3 solar masses - a class of double white dwarf binaries that may undergo a sub-Chandrasekhar mass type Ia detonation or merge to form a massive O/Ne WD, although orbital periods are required to infer on which timescales. One double-lined system located 49pc away, WDJ181058.67+311940.94, is super-Chandrasekhar mass, making it the second such double white dwarf binary to be discovered. |
| title | The DBL Survey I: discovery of 34 double-lined double white dwarf binaries |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2407.02594 |