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From WASP photometry and SOPHIE radial velocities we report the discovery ofWASP-40b (HAT-P-27b), a 0.6 Mjup planet that transits its 12th magnitude hoststar every 3.04 days. The host star is of late G-type or early K-type andlikely has a metallicity greater than solar ([Fe/H] = 0.14 +/- 0.11). Theplanet's mass and radius are typical of the known hot Jupiters, thus addinganother system to the apparent pileup of transiting planets with periods near 3to 4 days. Our parameters match those of the recent HATnet announcement of thesame planet, thus giving confidence in the techniques used. We report apossible indication of stellar activity in the host star.

WASP-40b: independent discovery of the 0.6-Mjup transiting exoplanet HAT-P-27b