The eclipsing post-common envelope binary CSS21055: a white dwarf with a probable brown-dwarf companion
- K. Beuermann
- S. Dreizler
- F. V. Hessman
- U. Backhaus
- A. Boesch
- T.-O. Husser
- L. Nortmann
- A. Schmelev
- R. Springer
DOIAbstract
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
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