2011A&A...536A..70S

We report the discovery of a new hot-Jupiter, KOI-196b, transiting a solar-type star with an orbital period of 1.855558-days±0.6s thanks to public photometric data from the Kepler space mission and new radial velocity observations obtained by the SOPHIE spectrograph mounted on the 1.93-m telescope at the Observatoire de Haute-Provence, France. The planet KOI-196b, with a radius of 0.89±0.05R_Jup and a mass of 0.55±0.09M_Jup, orbits a G6V star with R_*=1.02±0.03R_☉, M_*=1.12±0.07M_☉, [Fe/H]=0.29±0.16dex, T_eff=5620±140K, and an age of 650⁺²⁵⁰⁰_–300Myr. KOI-196b is one of the rare close-in hot Jupiters with a radius smaller than Jupiter suggesting that it is a non-inflated planet. The high precision of the Kepler photometry permits us to detect the secondary transit with a depth of 64 ⁺¹⁰_–12ppm as well as the optical phase variation. We find a geometric albedo of A_g=0.30±0.08, which is higher than most of the transiting hot Jupiters with a measured A_g. Assuming no heat recirculation, we find a day-side temperature of T_day=1730±400K. The planet KOI-196b seems to be one of the rare hot Jupiters located in the short-period hot-Jupiter desert.