Article (Scientific journals)
XX. CoRoT-20b: A very high density, high eccentricity transiting giant planet
Deleuil, M.; Bonomo, A. S.; Ferraz-Mello, S. et al.
2012In Astronomy and Astrophysics, 538, p. 145
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Keywords :
Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] 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 rotational velocity is vsini = 4.5 +/- 1.0 km/s, corresponding to a spin period of 11.5 +/- 3.1 days if its axis of rotation is perpendicular to the orbital plane. In the framework of Darwinian theories and neglecting stellar magnetic breaking, we calculate the tidal evolution of the system and show that CoRoT-20b is presently one of the very few Darwin-stable planets that is evolving towards a triple synchronous state with equality of the orbital, planetary and stellar spin periods.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
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  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
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.
More authors (36 more) Less
Language :
English
Title :
XX. CoRoT-20b: A very high density, high eccentricity transiting giant planet
Publication date :
01 September 2012
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
538
Pages :
145
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
10 pages, 10 figures
Available on ORBi :
since 10 November 2011

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