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A deeper view of the CoRoT-9 planetary system A small non-zero eccentricity for CoRoT-9b likely generated by planet-planet scattering

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Bonomo, A. S. ; Hebrard, G. ; Raymond, S. N. ; Bouchy, F. ; des Etangs, A. Lecavelier ; Borde, P. ; Aigrain, S. ; Almenara, J. -M. ; Alonso, R. ; Cabrera, J. ; Csizmadia, Sz. ; Damiani, C. ; Deeg, H. J. ; Deleuil, M. ; Diaz, R. F. ; Erikson, A. ; Fridlund, M. ; Gandolfi, D. ; Guenther, E. ; Guillot, T. ; Hatzes, A. ; Izidoro, A. ; Lovis, C. ; Moutou, C. ; Ollivier, M. ; Paetzold, M. ; Rauer, H. ; Rouan, D. ; Santerne, A. ; Schneider, J.
Número total de Autores: 30
Tipo de documento: Artigo Científico
Fonte: Astronomy & Astrophysics; v. 603, JUL 2017.
Citações Web of Science: 5

CoRoT-9b is one of the rare long-period (P = 95 : 3 days) transiting giant planets with a measured mass known to date. We present a new analysis of the CoRoT-9 system based on five years of radial-velocity (RV) monitoring with HARPS and three new space-based transits observed with CoRoT and Spitzer. Combining our new data with already published measurements we redetermine the CoRoT-9 system parameters and find good agreement with the published values. We uncover a higher significance for the small but non-zero eccentricity of CoRoT-9b (e = 0 : 133(-0.037)(+0.042)) and find no evidence for additional planets in the system. We use simulations of planet-planet scattering to show that the eccentricity of CoRoT-9b may have been generated by an instability in which a similar to 50 M-circle plus planet was ejected from the system. This scattering would not have produced a spin-orbit misalignment, so we predict that the CoRoT-9b orbit should lie within a few degrees of the initial plane of the protoplanetary disk. As a consequence, any significant stellar obliquity would indicate that the disk was primordially tilted. (AU)

Processo FAPESP: 16/19556-7 - Formação e Dinâmica Planetária: do Sistema Solar a Exoplanetas
Beneficiário:André Izidoro Ferreira da Costa
Modalidade de apoio: Bolsas no Brasil - Jovens Pesquisadores
Processo FAPESP: 16/12686-2 - Formação e dinâmica planetária: do Sistema Solar a exoplanetas
Beneficiário:André Izidoro Ferreira da Costa
Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores