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CoRoT-9
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Title: A deeper view of the CoRoT-9 planetary system. A small non-zero eccentricity for CoRoT-9b likely generated by planet-planet scattering
Author: A. S. Bonomo, G. Hébrard, S. N. Raymond, F. Bouchy, A. Lecavelier des Etangs, P. Bordé, S. Aigrain, J.-M. Almenara, R. Alonso, J. Cabrera, Sz. Csizmadia, C. Damiani, H. J. Deeg, M. Deleuil, R. F. Díaz, A. Erikson, M. Fridlund, D. Gandolfi, E. Guenther, T. Guillot, A. Hatzes, A. Izidoro, C. Lovis, C. Moutou, M. Ollivier, M. Pätzold, H. Rauer, D. Rouan, A. Santerne, J. Schneider

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 ~50 earth mass 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.

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RE: Corot-9b
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Combinant 145 jours de mesures obtenues par le satellite CoRoT du CNES, à celles du spectrographe HARPS de l'ESO, une équipe internationale vient de découvrir une nouvelle planète - CoRoT-9b - avec une probable température de surface d'environ 100°C, et dont les dimensions sont proches de celles de Jupiter, et qui tourne autour d'une étoile semblable au Soleil dans la constellation du Serpent, à quelques 1 500 années lumière de la Terre.
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It is 1,500 light-years from Earth but CoRoT-9b is the first temperate planet found known to be similar to those within our own Solar System.
The presence of CoRoT-9b was detected by a space mission designed to find planets we cannot see from the ground.

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Planet with 'temperate' climate found

European astronomers have found a planet outside our solar system with a relatively moderate temperature, far cooler than other "exoplanets" discovered to date.
The planet Corot-9b has an estimated surface temperature between 160 C and -20 C. It has about 80 per cent of the mass of Jupiter and its orbit is similar to that of Mercury.

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