A&A 488, L47-L50 (2008)
DOI: 10.1051/0004-6361:200810273

Letter

Transiting exoplanets from the CoRoT space mission

V. CoRoT-Exo-4b: stellar and planetary parameters

C. Moutou¹, H. Bruntt², T. Guillot³, A. Shporer⁴, E. Guenther⁵, S. Aigrain⁶, J. M. Almenara⁷, R. Alonso¹, M. Auvergne⁸, A. Baglin⁸, M. Barbieri¹, P. Barge¹, W. Benz⁹, P. Bordé¹⁰, F. Bouchy¹¹, H. J. Deeg⁷, R. De la Reza¹², M. Deleuil¹, R. Dvorak¹³, A. Erikson¹⁴, M. Fridlund¹⁵, M. Gillon¹⁶, P. Gondoin¹⁵, A. Hatzes⁵, G. Hébrard¹¹, L. Jorda¹, P. Kabath¹⁴, H. Lammer¹⁷, A. Léger¹⁰, A. Llebaria¹, B. Loeillet^{1, 11}, P. Magain¹⁸, M. Mayor¹⁶, T. Mazeh⁴, M. Ollivier¹⁰, M. Pätzold¹⁹, F. Pepe¹⁶, F. Pont⁶, D. Queloz¹⁶, M. Rabus⁷, H. Rauer^{14, 20}, D. Rouan⁸, J. Schneider²¹, S. Udry¹⁶, and G. Wuchterl<sup>5

1</sup>  LAM, UMR 6110, CNRS/Univ. de Provence, 38 rue F. Joliot-Curie, 13388 Marseille, France
    e-mail: claire.moutou@oamp.fr
²  School of Physics A28, University of Sydney, Australia
³  OCA, CNRS UMR 6202, BP 4229, 06304 Nice Cedex 4, France
⁴  Wise Observatory, Tel Aviv University, Tel Aviv 69978, Israel
⁵  Thüringer Landessternwarte, 07778 Tautenburg, Germany
⁶  School of Physics, Univ. of Exeter, Exeter EX4 4QL, UK
⁷  Instituto de Astrofísica de Canarias, 38205 La Laguna, Spain
⁸  LESIA, CNRS UMR 8109, Obs. de Paris, 92195 Meudon, France
⁹  Physikalische Institut Univ. Bern, 3012 Bern, Switzerland
¹⁰  IAS, Université Paris XI, 91405 Orsay, France
¹¹  IAP, CNRS, Univ. Pierre & Marie Curie, Paris, France
¹²  Observatório Nacional, Rio de Janeiro, RJ, Brazil
¹³  IfA University of Vienna, 1180 Vienna, Austria
¹⁴  Institute of Planetary Research, DLR, 12489 Berlin, Germany
¹⁵  RSSD, ESA/ESTEC, 2200 Noordwijk, The Netherlands
¹⁶  Obs. de Genève, Univ. de Genève, 1290 Sauverny, Switzerland
¹⁷  IWF, Austrian Academy of Sciences, 8042 Graz, Austria
¹⁸  IAG, Université de Liège, Allée du 6 août 17, Liège 1, Belgium
¹⁹  RIU, Universität zu Köln, 50931 Köln, Germany
²⁰  ZAA, Technical University Berlin, 10623 Berlin, Germany
²¹  LUTH, Obs. de Paris, 5 place J. Janssen, 92195 Meudon, France

Received 27 May 2008 / Accepted 14 July 2008

Abstract
Aims. The CoRoT satellite has announced its fourth transiting planet (Aigrain et al. 2008, A&A, 488, L43) with space photometry. We describe and analyse complementary observations of this system performed to establish the planetary nature of the transiting body and to estimate the fundamental parameters of the planet and its parent star.
Methods. We have analysed high precision radial-velocity data, ground-based photometry, and high signal-to-noise ratio spectroscopy.
Results. The parent star CoRoT-Exo-4 (2MASS 06484671-0040219) is a late F-type star of mass of 1.16 and radius of 1.17 . The planet has a circular orbit with a period of 9.20205 d. The planet radius is 1.19 and the mass is 0.72 . It is a gas-giant planet with a "normal" internal structure of mainly H and He. CoRoT-Exo-4b has the second longest period of the known transiting planets. It is an important discovery since it occupies an empty area in the mass-period diagram of transiting exoplanets.

Key words: planetary systems -- techniques: photometric -- techniques: radial velocities -- stars: fundamental parameters

© ESO 2008

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