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Discovery of the first resolved triple white dwarf
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Perpinyà-Vallès, M., Rebassa-Mansergas, A., Gaensicke, B. T. (Boris T.), Toonen, S., Hermes, J. J., Gentile Fusillo, N. P. and Tremblay, Pier-Emmanuel (2018) Discovery of the first resolved triple white dwarf. Monthly Notices of the Royal Astronomical Society, 483 (1). pp. 901-907. doi:10.1093/mnras/sty3149
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Official URL: https://doi.org/10.1093/mnras/sty3149
Abstract
We report the discovery of J1953–1019, the first resolved triple white dwarf system. The triplet consists of an inner white dwarf binary and a wider companion. Using Gaia DR2 photometry and astrometry combined with our follow-up spectroscopy, we derive effective temperatures, surface gravities, masses, and cooling ages of the three components. All three white dwarfs have pure-hydrogen (DA) atmospheres, masses of 0.60−0.63M⊙, and cooling ages of 40–290 Myr. We adopt eight initial-to-final mass relations to estimate the main-sequence progenitor masses (which we find to be similar for the three components, 1.6–2.6 M⊙) and lifetimes. The differences between the derived cooling times and main sequence lifetimes agree for most of the adopted initial-to-final mass relations, hence the three white dwarfs in J1953–1019 are consistent with coeval evolution. Furthermore, we calculate the projected orbital separations of the inner white dwarf binary (303.25 ± 0.01 au) and of the centre of mass of the inner binary and the outer companion (6398.97±0.09 au). From these values, and taking into account a wide range of possible configurations for the triplet to be currently dynamically stable, we analyse the future evolution of the system. We find that a collision between the two inner white dwarfs due to Lidov–Kozai oscillations is unlikely, though if it occurs it could result in a sub-Chandrasekhar Type Ia supernova explosion.
| Item Type: | Journal Article | |||||||||||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||||||||||||||||||||
| Divisions: | Faculty of Science > Physics | |||||||||||||||||||||||||||
| SWORD Depositor: | Library Publications Router | |||||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | White dwarf stars | |||||||||||||||||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||||||||||||||
| Publisher: | Oxford University Press (OUP) | |||||||||||||||||||||||||||
| ISSN: | 1365-2966 | |||||||||||||||||||||||||||
| Official Date: | 11 February 2018 | |||||||||||||||||||||||||||
| Dates: |
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| Date of first compliant deposit: | 18 January 2019 | |||||||||||||||||||||||||||
| Volume: | 483 | |||||||||||||||||||||||||||
| Number: | 1 | |||||||||||||||||||||||||||
| Page Range: | pp. 901-907 | |||||||||||||||||||||||||||
| DOI: | 10.1093/mnras/sty3149 | |||||||||||||||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||||||||||||||
| Publication Status: | Published | |||||||||||||||||||||||||||
| Publisher Statement: | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record M Perpinyà-Vallès, A Rebassa-Mansergas, B T Gänsicke, S Toonen, J J Hermes, N P Gentile Fusillo, P-E Tremblay; Discovery of the first resolved triple white dwarf, Monthly Notices of the Royal Astronomical Society, Volume 483, Issue 1, 11 February 2019, Pages 901–907, is available online at: https://doi.org/10.1093/mnras/sty3149 | |||||||||||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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