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

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. C...

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Detalles Bibliográficos
Autores principales: Bonomo, A.S., Hébrard, G., Raymond, S.N., Bouchy, F., Lecavelier Des Etangs, A., Bordé, P., Aigrain, S., Almenara, J.-M., Alonso, R., Cabrera, J., Csizmadia, S., Damiani, C., Deeg, H.J., Deleuil, M., Díaz, R.F., Erikson, A., Fridlund, M., Gandolfi, D., Guenther, E., Guillot, T., Hatzes, A., Izidoro, A., Lovis, C., Moutou, C., Ollivier, M., Pätzold, M., Rauer, H., Rouan, D., Santerne, A., Schneider, J.
Formato: JOUR
Materias:
Planetary systems
Stars: Individual: CoRoT-9
Techniques: Photometric
Techniques: Radial velocities
Planets
Giant planets
Planetary system
Protoplanetary disks
Radial velocity
Stars: individual
Techniques: photometric
Techniques: radial velocities
Zero eccentricity
Orbits
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00046361_v603_n_p_Bonomo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario: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 ⊕ 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. © ESO, 2017.

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