BONOMO, A. S.; HÉBRARD, G.; RAYMOND, Sean N.; BOUCHY, F.; LECAVELIER DES ETANGS, A.; BORDÉ, Pascal; AIGRAIN, S.; ALMENARA, J.-M.; ALONSO, R.; CABRERA, J.; CSIZMADIA, Sz.; 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

doi:10.1051/0004-6361/201730624

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BONOMO, A. S.

HÉBRARD, G.
Institut d'Astrophysique de Paris [IAP]

RAYMOND, Sean N.
ECLIPSE 2017

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Astronomy and Astrophysics - A&A. 2017-03, vol. 603, p. id.A43

EDP Sciences

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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 CoRoT-9b's small but non-zero eccentricity ($e=0.133^{+0.042}_{-0.037}$) and find no evidence for additional planets in the system. We use simulations of planet-planet scattering to show that CoRoT-9b's eccentricity may have been generated by an instability in which a $\sim 50~M_\oplus$ planet was ejected from the system. This scattering would not have produced a spin-orbit misalignment, so we predict that CoRoT-9b's 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.< Réduire

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Astrophysics - Earth and Planetary Astrophysics

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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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