Volume 558, October 2013
|Number of page(s)||6|
|Section||Stellar structure and evolution|
|Published online||11 October 2013|
The eclipsing post-common envelope binary CSS21055: a white dwarf with a probable brown-dwarf companion⋆
1 Institut für Astrophysik, Georg-August-Universität, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
2 Didaktik der Physik, Universität Duisburg-Essen, Universitätsstr. 2, 45117 Essen, Germany
Received: 9 July 2013
Accepted: 19 September 2013
We report photometric observations of the eclipsing close binary CSS21055 (SDSS J141126+200911) that strongly suggest that the companion to the carbon-oxygen white dwarf is a brown dwarf with a mass between 0.030 and 0.074 M⊙. The measured orbital period is 121.73 min and the totality of the eclipse lasts 125 s. If confirmed, CSS21055 would be the first detached eclipsing WD+BD binary. Spectroscopy in the eclipse could provide information about the companion’s evolutionary state and atmospheric structure.
Key words: binaries: close / binaries: eclipsing / white dwarfs / brown dwarfs / stars: individual: CSS21055 / stars: individual: SDSS J141126+200911
Light curves are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (126.96.36.199) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/558/A96
© ESO, 2013
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