A transiting giant planet with a temperature between 250 K and 430 K.

Abstract

Of the over 400 known exoplanets, there are about 70 planets that transit their central star, a situation that permits the derivation of their basic parameters and facilitates investigations of their atmospheres. Some short-period planets, including the first terrestrial exoplanet (CoRoT-7b), have been discovered using a space mission designed to find smaller and more distant planets than can be seen from the ground. Here we report transit observations of CoRoT-9b, which orbits with a period of 95.274 days on a low eccentricity of 0.11 +/- 0.04 around a solar-like star. Its periastron distance of 0.36 astronomical units is by far the largest of all transiting planets, yielding a 'temperate' photospheric temperature estimated to be between 250 and 430 K. Unlike previously known transiting planets, the present size of CoRoT-9b should not have been affected by tidal heat dissipation processes. Indeed, the planet is found to be well described by standard evolution models with an inferred interior composition consistent with that of Jupiter and Saturn.

DOI: 10.1038/nature08856

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@article{Deeg2010ATG, title={A transiting giant planet with a temperature between 250 K and 430 K.}, author={Hans-J{\"{o}rg Deeg and Claire Moutou and Anders Erikson and Sz . Csizmadia and B . Tingley and Pierre . Barge and Hans Bruntt and Michael Havel and Suzanne Aigrain and Jos{\'e}-Manuel Almenara and Roi Alonso and Michel Auvergne and Annie Baglin and Marco Barbieri and Willy Benz and Aldo S. Bonomo and Pascale Bord{\'e} and François Bouchy and Jos{\'e} A . Cabrera and Luisa Carone and Silvia Carpano and David R. Ciardi and Magali Deleuil and Rudolf Dvorak and Sylvio Ferraz-Mello and Malcolm Fridlund and Davide Gandolfi and J-C Gazzano and Micha{\"{e}l Gillon and Ph . Gondoin and Eike W. Guenther and T Guillot and Roland den Hartog and Artie P . Hatzes and Marton G. Hidas and Guillaume H{\'e}brard and Laurent Jorda and Petr Kabath and Helmut Lammer and A. L{\'e}ger and T. Andrew Lister and Antoine Llebaria and Christophe Lovis and Michel Mayor and Tsevi Mazeh and Morgane Ollivier and Martin P{\"a}tzold and Francesco Pepe and Fr{\'e}d{\'e}ric Pont and Didier Queloz and Markus Rabus and Heike Rauer and Daniel Rouan and Boni Samuel and Jo . Schneider and Avi Shporer and Bringfried Stecklum and Rachel A. Street and starsS . Udry and J. Weingrill and G{\"{u}nther Wuchterl}, journal={Nature}, year={2010}, volume={464 7287}, pages={384-7} }