Bouchy, F.[Institut d'astrophysique de Paris, Université Paris 6 & CNRS (UMR 7095), 98 bd Arago, 75014 Paris, France ; Observatoire de Haute-Provence, CNRS & OAMP, 04870 St-Michel l'Observatoire, France]
Deleuil, M.[Laboratoire d'astrophysique de Marseille, Université de Provence & CNRS (UMR 6110), 38 rue F. Joliot-Curie, 13388 Marseille, France]
Cabrera, J.[Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489 Berlin, Germany ; Laboratoire de l'univers et de ses théories, Observatoire de Paris & CNRS (UMR 8102), 5 place Jules Janssen, 92195 Meudon, France]
Jorda, L.[Laboratoire d'astrophysique de Marseille, Université de Provence & CNRS (UMR 6110), 38 rue F. Joliot-Curie, 13388 Marseille, France]
Lovis, C.[Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland]
Csizmadia, S.[Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489 Berlin, Germany]
Aigrain, S.[Department of Physics, Denys Wilkinson Building Keble Road, Oxford, OX1 3RH, UK]
Almenara, J. M.[Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain ; Departamento de Astrofísica, Universidad de La Laguna, 38200 La Laguna, Tenerife, Spain]
Alonso, R.[Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland]
Auvergne, M.[LESIA, UMR 8109 CNRS, Observatoire de Paris, UPMC, UniversitéParis-Diderot, 5 place J. Janssen, 92195 Meudon, France]
Baglin, A.[LESIA, UMR 8109 CNRS, Observatoire de Paris, UPMC, UniversitéParis-Diderot, 5 place J. Janssen, 92195 Meudon, France]
Barge, P.[Laboratoire d'astrophysique de Marseille, Université de Provence & CNRS (UMR 6110), 38 rue F. Joliot-Curie, 13388 Marseille, France]
Benz, W.[Physikalisches Institut Universität Bern, Sidlerstrasse 5, 3012 Bern, Switzerland]
Bonomo, A. S.[Laboratoire d'astrophysique de Marseille, Université de Provence & CNRS (UMR 6110), 38 rue F. Joliot-Curie, 13388 Marseille, France]
Bruntt, H.[LESIA, UMR 8109 CNRS, Observatoire de Paris, UPMC, UniversitéParis-Diderot, 5 place J. Janssen, 92195 Meudon, France]
Carone, L.[Rheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Str. 209, 50931 Köln, Germany]
Carpano, S.[Research and Scientific Support Department, European Space Agency, Keplerlaan, 2200AG, Noordwijk, The Netherlands]
Deeg, H.[Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain ; Departamento de Astrofísica, Universidad de La Laguna, 38200 La Laguna, Tenerife, Spain]
Dvorak, R.[Institute for Astronomy, University of Vienna, Türkenschanzstrasse 17, 1180, Vienna, Austria]
Erikson, A.[Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489 Berlin, Germany]
Ferraz-Mello, S.[Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, Brasil]
Fridlund, M.[Research and Scientific Support Department, European Space Agency, Keplerlaan, 2200AG, Noordwijk, The Netherlands]
Gandolfi, D.[Research and Scientific Support Department, European Space Agency, Keplerlaan, 2200AG, Noordwijk, The Netherlands ; Thüringer Landessternwarte, 07778 Tautenburg, Germany]
Gazzano, J*-C[Laboratoire d'astrophysique de Marseille, Université de Provence & CNRS (UMR 6110), 38 rue F. Joliot-Curie, 13388 Marseille, France]
Gillon, Michaël[Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Queloz, D.[Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland]
Rauer, H.[Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489 Berlin, Germany ; Center for Astronomy and Astrophysics, TU Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany]
Rouan, D.[LESIA, UMR 8109 CNRS, Observatoire de Paris, UPMC, UniversitéParis-Diderot, 5 place J. Janssen, 92195 Meudon, France]
Santerne, A.[Laboratoire d'astrophysique de Marseille, Université de Provence & CNRS (UMR 6110), 38 rue F. Joliot-Curie, 13388 Marseille, France]
Schneider, J.[Laboratoire de l'univers et de ses théories, Observatoire de Paris & CNRS (UMR 8102), 5 place Jules Janssen, 92195 Meudon, France]
Tingley, B.[Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain ; Departamento de Astrofísica, Universidad de La Laguna, 38200 La Laguna, Tenerife, Spain]
Udry, S.[Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland]
Weingrill, J.[Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, Graz, Austria]
[en] planets and satellites: detection ; stars: fundamental parameters ; techniques: photometric ; techniques: spectroscopic ; techniques: radial velocities ; planets and satellites: fundamental parameters
[en] <BR /> Aims: We report the discovery of CoRoT-8b, a dense small Saturn-class exoplanet that orbits a K1 dwarf in 6.2 days, and we derive its orbital parameters, mass, and radius. <BR /> Methods: We analyzed two complementary data sets: the photometric transit curve of CoRoT-8b as measured by CoRoT and the radial velocity curve of CoRoT-8 as measured by the HARPS spectrometer. <BR /> Results: We find that CoRoT-8b is on a circular orbit with a semi-major axis of 0.063 ± 0.001 AU. It has a radius of 0.57 ± 0.02 R[SUB]J[/SUB], a mass of 0.22 ± 0.03 M[SUB]J[/SUB], and therefore a mean density of 1.6 ± 0.1 g cm[SUP]-3[/SUP]. <BR /> Conclusions: With 67% of the size of Saturn and 72% of its mass, CoRoT-8b has a density comparable to that of Neptune (1.76 g cm[SUP]-3[/SUP]). We estimate its content in heavy elements to be 47-63 {M}_⊕, and the mass of its hydrogen-helium envelope to be 7-23 {M}_⊕. At 0.063 AU, the thermal loss of hydrogen of CoRoT-8b should be no more than 0.1% over an assumed integrated lifetime of 3 Ga. Observations made with SOPHIE spectrograph at Observatoire de Haute Provence, France (PNP.07B.MOUT), and the HARPS spectrograph at ESO La Silla Observatory (081.C-0388 and 083.C-0186). The CoRoT space mission, launched on December 27, 2006, has been developed and is operated by the CNES with the contribution of Austria, Belgium, Brasil, ESA, Germany, and Spain.Both data sets are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/520/A66">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/520/A66</A>
[Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
