Bours, M.C.P., Marsh, T.R., Parsons, S.G. et al. (6 more authors) (2014) Precise parameters for both white dwarfs in the eclipsing binary CSS 41177. Monthly Notices of the Royal Astronomical Society, 438 (4). pp. 3399-3408. ISSN 0035-8711
Abstract
We present ULTRACAM photometry and X-Shooter spectroscopy of the eclipsing double white dwarf binary CSS 41177, the only such system that is also a double-lined spectroscopic binary. Combined modelling of the light curves and radial velocities yield masses and radii for both white dwarfs without the need to assume mass–radius relations. We find that the primary white dwarf has a mass of M1 = 0.38 ± 0.02 M⊙ and a radius of R1 = 0.0222 ± 0.0004 R⊙. The secondary white dwarf's mass and radius are M2 = 0.32 ± 0.01 M⊙ and R2 = 0.0207 ± 0.0004 R⊙, and its temperature and surface gravity (T2 = 11678 ± 313 K, log(g2) = 7.32 ± 0.02) put it close to the white dwarf instability strip. However, we find no evidence for pulsations to roughly 0.5 per cent relative amplitude. Both masses and radii are consistent with helium white dwarf models with thin hydrogen envelopes of ≤10−4 M*. The two stars will merge in 1.14 ± 0.07 Gyr due to angular momentum loss via gravitational wave emission.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2014 The Authors. This is an author produced version of a paper subsequently published in Monthly Notices of the Royal Astronomical Society. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | methods: statistical; techniques: radial velocities; binaries: eclipsing; stars: individual: SDSS J100559; 10+224932; 3; white dwarfs |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 14 Dec 2016 16:37 |
Last Modified: | 26 Mar 2018 16:08 |
Published Version: | https://doi.org/10.1093/mnras/stt2453 |
Status: | Published |
Publisher: | Oxford University Press |
Refereed: | Yes |
Identification Number: | 10.1093/mnras/stt2453 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:108495 |