Transiting Exoplanets from the Corot Space Mission. XI. Corot-8B: a Hot
Astronomy & Astrophysics manuscript no. corot-8b c ESO 2018 October 23, 2018 Transiting exoplanets from the CoRoT space mission XI. CoRoT-8b: a hot and dense sub-Saturn around a K1 dwarf? P. Borde´1, F. Bouchy2;3, M. Deleuil4, J. Cabrera5;6, L. Jorda4, C. Lovis7, S. Csizmadia5, S. Aigrain8, J. M. Almenara9;10, R. Alonso7, M. Auvergne11, A. Baglin11, P. Barge4, W. Benz12, A. S. Bonomo4, H. Bruntt11, L. Carone13, S. Carpano14, H. Deeg9;10, R. Dvorak15, A. Erikson5, S. Ferraz-Mello16, M. Fridlund14, D. Gandolfi14;17, J.-C. Gazzano4, M. Gillon18, E. Guenther17, T. Guillot19, P. Guterman4, A. Hatzes17, M. Havel19, G. Hebrard´ 2, H. Lammer20, A. Leger´ 1, M. Mayor7, T. Mazeh21, C. Moutou4, M. Patzold¨ 13, F. Pepe7, M. Ollivier1, D. Queloz7, H. Rauer5;22, D. Rouan11, B. Samuel1, A. Santerne4, J. Schneider6, B. Tingley9;10, S. Udry7, J. Weingrill20, and G. Wuchterl17 (Affiliations can be found after the references) Received ?; accepted ? ABSTRACT Aims. 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. Methods. 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??. Results. 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 −3 0:22 ± 0:03 MJ, and therefore a mean density of 1:6 ± 0:1 g cm .
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