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We report the discovery by the WASP transit survey of a giant planet in aclose orbit (0.0295+-0.0009 AU) around a moderately bright (V=11.6, K=10) G9dwarf (0.89+-0.08 M_sun, 0.84+-0.03 R_sun) in the Southern constellationEridanus. Thanks to high-precision follow-up photometry and spectroscopyobtained by the telescopes TRAPPIST and Euler, the mass and size of thisplanet, WASP-50b, are well constrained to 1.47+-0.09 M_jup and 1.15+-0.05R_jup, respectively. The transit ephemeris is 2455558.6120 (+-0.0002) + N x1.955096 (+-0.5) HJD_UTC. The size of the planet is consistent with basicmodels of irradiated giant planets. The chromospheric activity (log R'_HK =-4.67) and rotational period (P_rot = 16.3+-0.5 days) of the host star suggestan age of 0.8+-0.4 Gy that is discrepant with a stellar-evolution estimatebased on the measured stellar parameters (rho_star = 1.48+-0.10 rho_sun, Teff =5400+-100 K, [Fe/H]= -0.12+-0.08) which favours an age of 7+-3.5 Gy. Thisdiscrepancy could be explained by the tidal and magnetic influence of theplanet on the star, in good agreement with the observations that stars hostinghot Jupiters tend to show faster rotation and magnetic activity (Pont 2009;Hartman 2010). We measure a stellar inclination of 84 (-31,+6) deg,disfavouring a high stellar obliquity. Thanks to its large irradiation and therelatively small size of its host star, WASP-50b is a good target foroccultation spectrophotometry, making it able to constrain the relationshipbetween hot Jupiters' atmospheric thermal profiles and the chromosphericactivity of their host stars proposed by Knutson et al. (2010).

WASP-50b: a hot Jupiter transiting a moderately active solar-type star