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The shortest period detached white dwarf + main-sequence binary

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Parsons, S. G., Marsh, T. R., Gaensicke, B. T. (Boris T.), Dhillon, V. S., Copperwheat, C. M., Littlefair, S. P., Pyrzas, S., Drake, A. J., Koester, Detlev, 1941-, Schreiber, Matthias R. and Rebassa-Mansergas, A.. (2012) The shortest period detached white dwarf + main-sequence binary. Monthly Notices of the Royal Astronomical Society, Vol.419 (No.1). pp. 304-313. ISSN 0035-8711

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Abstract

We present high-speed ULTRACAM and SOFI photometry and X-shooter spectroscopy of the recently discovered 94-min orbital period eclipsing white dwarf/main-sequence binary SDSS J085746.18+034255.3 (CSS 03170) and use these observations to measure the system parameters. We detect a shallow secondary eclipse and hence are able to determine an orbital inclination of i= 85?5 ± 0?2. The white dwarf has a mass of 0.51 ± 0.05 Msun and a radius of 0.0247 ± 0.0008 Rsun. With a temperature of 35 300 ± 400 K the white dwarf is highly overinflated if it has a carbon-oxygen core; however, if it has a helium core then its mass and radius are consistent with evolutionary models. Therefore, the white dwarf in SDSS J085746.18+034255.3 is most likely a helium core white dwarf with a mass close to the upper limit expected from evolution. The main-sequence star is an M8 dwarf with a mass of 0.09 ± 0.01 Msun and a radius of 0.110 ± 0.004 Rsun placing it close to the hydrogen burning limit. The system emerged from a common envelope ˜20 million years ago and will reach a semidetached configuration in ˜400 million years, becoming a cataclysmic variable with a period of 66 min, below the period minimum.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Eclipsing binaries, White dwarf stars, Low mass stars
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Wiley
ISSN: 0035-8711
Official Date: January 2012
Volume: Vol.419
Number: No.1
Page Range: pp. 304-313
Identification Number: 10.1111/j.1365-2966.2011.19691.x
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Science and Technology Facilities Council (Great Britain) (STFC), Fondo Nacional de Desarrollo Científico y Tecnológico (Chile) (FONDECYT)
Grant number: 3110049 (FONDECYT), 1100782 (FONDECYT)
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URI: http://wrap.warwick.ac.uk/id/eprint/39777

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