XX. CoRoT-20b: A very high density, high eccentricity transiting giant planet
- Deleuil, M.
- Bonomo, A. S.
- Ferraz-Mello, S.
- Erikson, A.
- Bouchy, F.
- Havel, M.
- Aigrain, S.
- Almenara, J.-M.
- Alonso, R.
- Auvergne, M.
- Baglin, A.
- Barge, P.
- Bordé, P.
- Bruntt, H.
- Cabrera, J.
- Carpano, S.
- Cavarroc, C.
- Csizmadia, Szilard
- Damiani, C.
- Deeg, H. J.
- Dvorak, R.
- Fridlund, M.
- Hébrard, G.
- Gandolfi, D.
- Gillon, Michaël
- Guenther, E.
- Guillot, T.
- Hatzes, A.
- Jorda, L.
- Léger, A.
- Lammer, H.
- Mazeh, T.
- Moutou, C.
- Ollivier, M.
- Ofir, A.
- Parviainen, H.
- Queloz, D.
- Rauer, H.
- Rodríguez, A.
- Rouan, D.
- Santerne, A.
- Schneider, J.
- Tal-Or, L.
- Tingley, B.
- Weingrill, J.
- Wuchterl, G.
DOIAbstract
We report the discovery by the CoRoT space mission of a new giant planet, CoRoT-20b. The planet has a mass of 4.24 +/- 0.23 MJ and a radius of 0.84 +/- 0.04 RJ. With a mean density of 8.87 +/- 1.10 g/cm^3, it is among the most compact planets known so far. Evolution models for the planet suggest a mass of heavy elements of the order of 800 ME if embedded in a central core, requiring a revision either of the planet formation models or of planet evolution and structure models. We note however that smaller amounts of heavy elements are expected from more realistic models in which they are mixed throughout the envelope. The planet orbits a G-type star with an orbital period of 9.24 days and an eccentricity of 0.56. The star's projected rotation...
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