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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

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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
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:
DateEvent
11 February 2018Published
22 November 2018Available
19 November 2018Accepted
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:
Project/Grant IDRIOXX Funder NameFunder ID
RYC-2016-2025[MINECO] Ministerio de Economía y Competitividadhttp://dx.doi.org/10.13039/501100003329
AYA2017-86274-P[MINECO] Ministerio de Economía y Competitividadhttp://dx.doi.org/10.13039/501100003329
GR-661/2017Agència de Gestió d’Ajuts Universitaris i de Recercahttp://dx.doi.org/10.13039/501100003030
639.041.645[NWO] Nederlandse Organisatie voor Wetenschappelijk Onderzoekhttp://dx.doi.org/10.13039/501100003246
320964Seventh Framework Programmehttp://dx.doi.org/10.13039/100011102
677706-WD3DH2020 European Research Councilhttp://dx.doi.org/10.13039/100010663
#HST-HF2-51357.001-A[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
NAS5-26555[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
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