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http://hdl.handle.net/20.500.12386/28693
Titolo: | A deeper view of the CoRoT-9 planetary system. A small non-zero eccentricity for CoRoT-9b likely generated by planet-planet scattering | Autori: | BONOMO, ALDO STEFANO Hébrard, G. Raymond, S. N. Bouchy, F. Lecavelier des Etangs, A. Bordé, P. 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. |
Data pubblicazione: | 2017 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 603 | Da pagina:: | A43 | Abstract: | <ASTROBJ>CoRoT-9b</ASTROBJ> 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 <ASTROBJ>CoRoT-9</ASTROBJ> 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>⊕</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. | URI: | http://hdl.handle.net/20.500.12386/28693 | URL: | https://www.aanda.org/articles/aa/full_html/2017/07/aa30624-17/aa30624-17.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201730624 | Bibcode ADS: | 2017A&A...603A..43B | Fulltext: | open |
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