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Precise parameters for both white dwarfs in the eclipsing binary CSS 41177
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Bours, Madelon C. P., Marsh, T. R., Parsons, S. G., Copperwheat, C. M., Dhillon, V. S., Littlefair, S. P., Gänsicke, B. T. (Boris T.), Gianninas, A. and Tremblay, Pier-Emmanuel (2014) Precise parameters for both white dwarfs in the eclipsing binary CSS 41177. Monthly Notices of the Royal Astronomical Society, Volume 438 (Number 4). pp. 3399-3408. doi:10.1093/mnras/stt2453 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stt2453
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.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||
| Publisher: | Oxford University Press | ||||||||
| ISSN: | 0035-8711 | ||||||||
| Official Date: | 27 January 2014 | ||||||||
| Dates: |
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| Volume: | Volume 438 | ||||||||
| Number: | Number 4 | ||||||||
| Page Range: | pp. 3399-3408 | ||||||||
| DOI: | 10.1093/mnras/stt2453 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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