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

[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.

More authors (36 more)

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

Additional URL :

http://adsabs.harvard.edu/abs/2012A%26A...538A.145D

Commentary :

10 pages, 10 figures

Available on ORBi :

since 10 November 2011

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Auvergne, M., Bodin, P., Boisnard, L., et al. 2009, A&A, 506, 411
Baglin, A., Auvergne, M., Barge, P., et al. 2009, in IAU Symp., 253, 81
Bakos, G. Á., Hartman, J., Torres, G., et al. 2011, ApJ, 742, 116
Baraffe, I., Chabrier, G., & Barman, T. 2008, A&A, 482, 315
Baranne, A., Queloz, D., Mayor, M., et al. 1996, A&AS, 119, 373
Bean, J. L. 2009, A&A, 506, 369
Benítez-Llambay, P., Masset, F., & Beaugé, C. 2011, A&A, 528, A2
Boley, A. C., & Durisen, R. H. 2010, ApJ, 724, 618
Boley, A. C., Helled, R., & Payne, M. J. 2011, ApJ, 735, 30
Bordé, P., Bouchy, F., Deleuil, M., et al. 2010, A&A, 520, A66
Borkovits, T. 2004, Publications of the Astronomy Department of the Eotvos Lorand University, 14, 207
Borucki, W. J., Koch, D., Basri, G., et al. 2010, Science, 327, 977
Bouchy, F., Bonomo, A. S., Santerne, A., et al. 2011, A&A, 533, A83
Bouchy, F., Moutou, C., Queloz, D., & the CoRoT Exoplanet Science Team. 2009, in IAU Symp., 253, 129
Bouvier, J., Forestini, M., & Allain, S. 1997, A&A, 326, 1023
Bruntt, H., Bedding, T. R., Quirion, P., et al. 2010a, MNRAS, 405, 1907
Bruntt, H., Bikmaev, I. F., Catala, C., et al. 2004, A&A, 425, 683
Bruntt, H., Deleuil, M., Fridlund, M., et al. 2010b, A&A, 519, A51
Buchhave, L. A., Bakos, G. Á., Hartman, J. D., et al. 2010, ApJ, 720, 1118
Burrows, A., Heng, K., & Nampaisarn, T. 2011, ApJ, 736, 47
Claret, A. 2003, A&A, 401, 657
Claret, A. 2004, A&A, 428, 1001
Csizmadia, S., Renner, S., Barge, P., et al. 2010, A&A, 510, A94
Deeg, H. J., Gillon, M., Shporer, A., et al. 2009, A&A, 506, 343
Deleuil, M., Meunier, J. C., Moutou, C., et al. 2009, AJ, 138, 649
Deleuil, M., Moutou, C., & Bordé, P. 2011, Detection and Dynamics of Transiting Exoplanets, St. Michel l'Observatoire, France, ed. F. Bouchy, R. Díaz & C. Moutou, EPJ Web of Conferences, 11, 1001
Eggleton, P. P., Kiseleva, L. G., & Hut, P. 1998, ApJ, 499, 853
Faber, J. A., Rasio, F. A., & Willems, B. 2005, Icarus, 175, 248
Fabrycky, D., & Tremaine, S. 2007, ApJ, 669, 1298
Ferraz-Mello, S., Rodríguez, A., & Hussmann, H. 2008, Cel. Mech. Dyn. Astron., 101, 171
Ford, E. B., & Rasio, F. A. 2006, ApJ, 638, L45
Frandsen, S., & Lindberg, B. 1999, in Astrophysics with the NOT, ed. H. Karttunen & V. Piirola, 71
Fressin, F., Torres, G., Désert, J.-M., et al. 2011, ApJS, 197, 5
Giménez, A. 2006, A&A, 450, 1231
Giménez, A. 2009, in The Eighth Pacific Rim Conference on Stellar Astrophysics: A Tribute to Kam-Ching Leung, ed. S. J. Murphy & M. S. Bessell, ASP Conf. Ser., 404, 291
Gonzalez, G. 1997, MNRAS, 285, 403
Guillot, T., & Havel, M. 2011, A&A, 527, A20
Guillot, T., & Morel, P. 1995, A&AS, 109, 109
Guillot, T., Santos, N. C., Pont, F., et al. 2006, A&A, 453, L21
Hansen, B. M. S. 2010, ApJ, 723, 285
Havel, M., Guillot, T., Valencia, D., & Crida, A. 2011, A&A, 531, A3
Hellier, C., Anderson, D. R., Collier Cameron, A., et al. 2009, Nature, 460, 1098
Holman, M. J., Fabrycky, D. C., Ragozzine, D., et al. 2010, Science, 330, 51
Hut, P. 1980, A&A, 92, 167
Hut, P. 1981, A&A, 99, 126
Ida, S., & Lin, D. N. C. 2004, ApJ, 616, 567
Ikoma, M., Guillot, T., Genda, H., Tanigawa, T., & Ida, S. 2006, ApJ, 650, 1150
Jackson, B., Barnes, R., & Greenberg, R. 2009, ApJ, 698, 1357
Lainey, V., Arlot, J.-E., Karatekin, Ö., & van Hoolst, T. 2009, Nature, 459, 957
Leconte, J., Chabrier, G., Baraffe, I., & Levrard, B. 2011, Detection and Dynamics of Transiting Exoplanets, St. Michel l'Observatoire, France, ed. F. Bouchy, R. Díaz & C. Moutou, EPJ Web of Conferences, 11, 110
Levrard, B., Winisdoerffer, C., & Chabrier, G. 2009, ApJ, 692, L9
Lin, D. N. C., Bodenheimer, P., & Richardson, D. C. 1996, Nature, 380, 606
Lissauer, J. J., Fabrycky, D. C., Ford, E. B., et al. 2011, Nature, 470, 53
Matsumura, S., Peale, S. J., & Rasio, F. A. 2010, ApJ, 725, 1995
Mayor, M., Pepe, F., Queloz, D., et al. 2003, The Messenger, 114, 20
Mignard, F. 1979, Moon and Planets, 20, 301
Miller, N., & Fortney, J. J. 2011, ApJ, 736, L29
Mordasini, C., Alibert, Y., Benz, W., & Naef, D. 2009, A&A, 501, 1161
Morel, P., & Lebreton, Y. 2008, Ap&SS, 316, 61
Nagasawa, M., Ida, S., & Bessho, T. 2008, ApJ, 678, 498
Ogilvie, G. I., & Lin, D. N. C. 2004, ApJ, 610, 477
Papaloizou, J. C. B., Nelson, R. P., Kley, W., Masset, F. S., & Artymowicz, P. 2007, Protostars and Planets V, 655
Pepe, F., Mayor, M., Galland, F., et al. 2002, A&A, 388, 632
Perruchot, S., Kohler, D., Bouchy, F., et al. 2008, in SPIE Conf. Ser., 7014
Pont, F., Husnoo, N., Mazeh, T., & Fabrycky, D. 2011, MNRAS, 414, 1278
Press, W. H., Teukolsky, S. A., Vetterling, W. T., & Flannery, B. P. 1992, Numerical recipes in FORTRAN, The art of scientific computing
Rasio, F. A., & Ford, E. B. 1996, Science, 274, 954
Santerne, A., Endl, M., Hatzes, A., et al. 2011, Detection and Dynamics of Transiting Exoplanets, St. Michel l'Observatoire, France, ed. F. Bouchy, R. Díaz & C. Moutou, EPJ Web of Conferences, 11, 2001
Schlegel, D. J., Finkbeiner, D. P., & Davis, M. 1998, ApJ, 500, 525
Sestito, P., & Randich, S. 2005, A&A, 442, 615
Sing, D. K. 2010, A&A, 510, A21
Southworth, J. 2010, MNRAS, 408, 1689
Surace, C., Alonso, R., Barge, P., et al. 2008, in SPIE Conf. Ser., 7019
Tingley, B., Endl, M., Gazzano, J.-C., et al. 2011, A&A, 528, A97
Udry, S., Mayor, M., & Queloz, D. 1999, in Precise Stellar Radial Velocities, ed. J. B. Hearnshaw & C. D. Scarfe, IAU Colloq. 170, ASP Conf. Ser., 185, 367
Winn, J. N., Fabrycky, D., Albrecht, S., & Johnson, J. A. 2010, ApJ, 718, L145