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We report the discovery by the CoRoT space mission of a transiting browndwarf orbiting a F7V star with an orbital period of 3.06 days. CoRoT-15b has aradius of 1.12 +0.30 -0.15 Rjup, a mass of 63.3 +- 4.1 Mjup, and is thus thesecond transiting companion lying in the theoretical mass domain of browndwarfs. CoRoT-15b is either very young or inflated compared to standardevolution models, a situation similar to that of M-dwarfs stars orbiting closeto solar-type stars. Spectroscopic constraints and an analysis of thelightcurve favors a spin period between 2.9 and 3.1 days for the central star,compatible with a double-synchronisation of the system.

Transiting exoplanets from the CoRoT space mission. XV. CoRoT-15b: a brown dwarf transiting companion