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Bonomo Aldo Stefano, Hébrard Guillaume, Raymond Sean N., Bouchy François, Lecavelier des Etangs Alain, Bordé P., Aigrain Suzanne, Almenara J. M., Alonso Roi, Cabrera Juan, Csizmadia Szilard, Badache Damiani Cilia, Deeg Hans J., Deleuil Magali, Díaz R. F., Erikson Anders, Fridlund Malcolm C., Gandolfi Davide, Guenther Eike, Guillot Tristan, Hatzes Artie P., Izidoro A., Lovis Christophe, Moutou Claire, Ollivier Marc, Pätzold M., Rauer Heike, Rouan Daniel, Santerne A., Schneider Jean

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

Astronomy and Astrophysics, 2017, vol. 603

Référence DOI : 10.1051/0004-6361/201730624
Référence ADS : 2017A&A...603A..43B

Résumé :

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 () 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 50 M<SUB>&oplus;</SUB> 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.

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