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Insights into internal effects of common-envelope evolution using the extended Kepler mission
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Hermes, J. J., Gänsicke, B. T. (Boris T.), Bischoff-Kim, A., Kawaler, S. D., Fuchs, J. T., Dunlap, Bart H., Clemens, J. Christopher, Montgomery, M. H., Chote, Paul, Barclay, T., Marsh, T. R., Gianninas, A., Koester, Detlev, Winget, D. E., Armstrong, David J., Rebassa-Mansergas, A. and Schreiber, Matthias R. (2015) Insights into internal effects of common-envelope evolution using the extended Kepler mission. Monthly Notices of the Royal Astronomical Society, 451 (2). pp. 1701-1712. doi:10.1093/mnras/stv1053 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stv1053
Abstract
We present an analysis of the binary and physical parameters of a unique pulsating white dwarf with a main-sequence companion, SDSS J1136+0409, observed for more than 77 d during the first pointing of the extended Kepler mission: K2 Campaign 1. Using new groundbased spectroscopy, we show that this post-common-envelope binary has an orbital period of 6.89760103(60) h, which is also seen in the photometry as a result of Doppler beaming and ellipsoidal variations of the secondary. We spectroscopically refine the temperature of the white dwarf to 12 330 ± 260 K and its mass to 0.601 ± 0.036 M. We detect seven independent pulsation modes in the K2 light curve. A preliminary asteroseismic solution is in reasonable agreement with the spectroscopic atmospheric parameters. Three of the pulsation modes are clearly rotationally split multiplets, which we use to demonstrate that the white dwarf is not synchronously rotating with the orbital period but has a rotation period of 2.49 ± 0.53 h. This is faster than any known isolated white dwarf, but slower than almost all white dwarfs measured in non-magnetic cataclysmic variables, the likely future state of this binary.
Item Type: | Journal Article | ||||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
Library of Congress Subject Headings (LCSH): | Double stars, White dwarf stars | ||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||
Publisher: | Oxford University Press | ||||||||||
ISSN: | 0035-8711 | ||||||||||
Official Date: | 1 August 2015 | ||||||||||
Dates: |
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Volume: | 451 | ||||||||||
Number: | 2 | ||||||||||
Number of Pages: | 12 | ||||||||||
Page Range: | pp. 1701-1712 | ||||||||||
DOI: | 10.1093/mnras/stv1053 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||
Date of first compliant deposit: | 15 April 2016 | ||||||||||
Date of first compliant Open Access: | 18 April 2016 | ||||||||||
Funder: | European Research Council (ERC), Seventh Framework Programme (European Commission) (FP7), National Science Foundation (U.S.) (NSF), Science and Technology Facilities Council (Great Britain) (STFC), Fondo Nacional de Desarrollo Científico y Tecnológico (Chile) (FONDECYT), Chile. Ministerio de Economía, Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC) | ||||||||||
Grant number: | 320964 (FP7), AST-1312983 (NSF), AST-1413001 (NSF), NNX12AC96G (NASA), ST/L000733/1 (STFC), HST-GO-13319.01 (NASA), NAS 5-26555 (NASA), 1141269 (FONDECYT), RC130007, 2013M530470 (NSFC), 2014T70010 (NSFC), 11350110496 (NSFC) |
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