Two new double-lined spectroscopic binary white dwarfs

Author:

Kilic Mukremin1ORCID,Bédard A2,Bergeron P2,Kosakowski Alekzander1

Affiliation:

1. Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, 440 W. Brooks St, Norman, OK 73019, USA

2. Département de Physique, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, QC H3C 3J7, Canada

Abstract

ABSTRACT We present radial velocity observations of four binary white dwarf candidates identified through their overluminosity. We identify two new double-lined spectroscopic binary systems, WD 0311–649 and WD 1606+422, and constrain their orbital parameters. WD 0311–649 is a 17.7 h period system with a mass ratio of 1.44 ± 0.06 and WD 1606+422 is a 20.1 h period system with a mass ratio of 1.33 ± 0.03. An additional object, WD 1447–190, is a 43 h period single-lined white dwarf binary, whereas WD 1418–088 does not show any significant velocity variations over time-scales ranging from minutes to decades. We present an overview of the 14 overluminous white dwarfs that were identified by Bédard et al., and find the fraction of double- and single-lined systems to be both 31 per cent. However, an additional 31 per cent of these overluminous white dwarfs do not show any significant radial velocity variations. We demonstrate that these must be in long-period binaries that may be resolved by Gaia astrometry. We also discuss the overabundance of single low-mass white dwarfs identified in the SPY survey, and suggest that some of those systems are also likely long-period binary systems of more massive white dwarfs.

Funder

NSF

NSERC

Danish National Research Foundation

NASA Exoplanet Science Institute

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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1. The Gaia white dwarf revolution;New Astronomy Reviews;2024-12

2. The DBL Survey I: discovery of 34 double-lined double white dwarf binaries;Monthly Notices of the Royal Astronomical Society;2024-07-04

3. The 40 pc sample of white dwarfs from Gaia;Monthly Notices of the Royal Astronomical Society;2023-11-27

4. The ELM Survey South. II. Two Dozen New Low-mass White Dwarf Binaries;The Astrophysical Journal;2023-06-01

5. Gaia white dwarfs within 40 pc – III. Spectroscopic observations of new candidates in the Southern hemisphere;Monthly Notices of the Royal Astronomical Society;2022-11-12

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