WASP-10b: a 3MJ, gas-giant planet transiting a late-type K star

We report the discovery ofWASP-10b, a new transiting extrasolar planet (ESP) discovered by the Wide Angle Search for Planets (WASP) Consortium and confirmed using Nordic Optical Telescope FIbre-fed Echelle Spectrograph and SOPHIE radial velocity data. A 3.09-d period, 29 mmag transit depth and 2.36 h duration are derived for WASP-10b using WASP and highprecision photometric observations. Simultaneous fitting to the photometric and radial velocity data using aMarkov ChainMonte Carlo procedure leads to a planet radius of 1.28RJ, a mass of 2.96MJ and eccentricity of ?0.06.WASP-10b is one of the more massive transiting ESPs, and we compare its characteristics to the current sample of transiting ESP, where there is currently little information for masses greater than ?2MJ and non-zero eccentricities. WASP-10's host star, GSC 2752?00114 (USNO-B1.0 1214?0586164) is among the fainter stars in theWASPsample, with V = 12.7 and a spectral type of K5. This result shows promise for future late-type dwarf star surveys.