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We report photometric observations of the eclipsing close binary CSS21055(SDSS J141126+200911) that strongly suggest that the companion to thecarbon-oxygen white dwarf is a brown dwarf with a mass between 0.030 and 0.074Msun. The measured orbital period is 121.73min and the totality of the eclipselasts 125s. If confirmed, CSS21055 would be the first detached eclipsing WD+BDbinary. Spectroscopy in the eclipse could provide information about thecompanion's evolutionary state and atmospheric structure.

The eclipsing post-common envelope binary CSS21055: a white dwarf with a probable brown-dwarf companion