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Radius constraints from high-speed photometry of 20 low-mass white dwarf binaries
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Hermes, J. J., Brown, Warren R., Kilic, Mukremin, Gianninas, A., Chote, Paul, Sullivan, Denis J., Winget, D. E., Bell, Keaton J., Falcon, R. E., Winget, K. I., Mason, Paul A., Harrold, Samuel T. and Montgomery, M. H. (2014) Radius constraints from high-speed photometry of 20 low-mass white dwarf binaries. The Astrophysical Journal, Volume 792 (Number 1). Article number 39. doi:10.1088/0004-637X/792/1/39 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1088/0004-637X/792/1/39
Abstract
We carry out high-speed photometry on 20 of the shortest-period, detached white dwarf binaries known and discover systems with eclipses, ellipsoidal variations (due to tidal deformations of the visible white dwarf), and Doppler beaming. All of the binaries contain low-mass white dwarfs with orbital periods of less than four hr. Our observations identify the first eight tidally distorted white dwarfs, four of which are reported for the first time here. We use these observations to place empirical constraints on the mass-radius relationship for extremely low-mass (≤0.30 M ☉) white dwarfs. We also detect Doppler beaming in several of these binaries, which confirms their high-amplitude radial-velocity variability. All of these systems are strong sources of gravitational radiation, and long-term monitoring of those that display ellipsoidal variations can be used to detect spin-up of the tidal bulge due to orbital decay.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Journal or Publication Title: | The Astrophysical Journal | ||||||||
Publisher: | Institute of Physics Publishing, Inc. | ||||||||
ISSN: | 0004-637X | ||||||||
Official Date: | 13 August 2014 | ||||||||
Dates: |
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Volume: | Volume 792 | ||||||||
Number: | Number 1 | ||||||||
Article Number: | Article number 39 | ||||||||
DOI: | 10.1088/0004-637X/792/1/39 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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