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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.

EDP Sciences 2012

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XX. CoRoT-20b: A very high density, high eccentricity transiting giant planet
Autor: 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.
Assuntos: Astrophysics - Earth and Planetary Astrophysics ; Aérospatiale, astronomie & astrophysique ; Physical, chemical, mathematical & earth Sciences ; Physique, chimie, mathématiques & sciences de la terre ; Space science, astronomy & astrophysics
Notas: scopus-id:2-s2.0-84855564528
Descrição: 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.
Editor: EDP Sciences
Data de criação/publicação: 2012
Idioma: Inglês

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XX. CoRoT-20b: A very high density, high eccentricity transiting giant planet

EDP Sciences 2012

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