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Auvergne, M. Deleuil, M. Fridlund, M. Gillon, M. Havel, M. Mayor, M. Ollivier, M. P\\\"atzold, P. Barge, P. Bord\\'e, P. Guterman, R. Alonso, R. Dvorak, S. Aigrain, S. Carpano, S. Csizmadia, S. Ferraz-Mello, S. Udry, T. Guillot, T. Mazeh, W. Benz","submitted_at":"2010-08-02T15:31:33Z","abstract_excerpt":"We report the discovery of CoRoT-8b, a dense small Saturn-class exoplanet that orbits a K1 dwarf in 6.2 days, and we derive its orbital parameters, mass, and radius. We analyzed two complementary data sets: the photometric transit curve of CoRoT-8b as measured by CoRoT and the radial velocity curve of CoRoT-8 as measured by the HARPS spectrometer. We find that CoRoT-8b is on a circular orbit with a semi-major axis of 0.063 +/- 0.001 AU. It has a radius of 0.57 +/- 0.02 RJ, a mass of 0.22 +/- 0.03 MJ, and therefore a mean density 1.6 +/- 0.1 g/cm^3. 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