Transiting exoplanets from the CoRoT space mission - III. The spectroscopic transit of CoRoT-Exo-2b with SOPHIE and HARPS (original) (raw)

A&A 482, L25-L28 (2008)

Letter to the Editor

III. The spectroscopic transit of CoRoT-Exo-2b with SOPHIE and HARPS

1, D. Queloz2, M. Deleuil3, B. Loeillet1,3, A. P. Hatzes4, S. Aigrain5, R. Alonso3, M. Auvergne6, A. Baglin6, P. Barge3, W. Benz7, P. Bordé8, H. J. Deeg9, R. De la Reza10, R. Dvorak11, A. Erikson12, M. Fridlund13, P. Gondoin13, T. Guillot14, G. Hébrard1, L. Jorda3, H. Lammer15, A. Léger8, A. Llebaria3, P. Magain16, M. Mayor2, C. Moutou3, M. Ollivier8, M. Pätzold17, F. Pepe2, F. Pont2, H. Rauer12,18, D. Rouan6, J. Schneider19, A. H. M. J. Triaud2, S. Udry2 and G. Wuchterl4

1 Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Bd Arago, 75014 Paris, France e-mail: bouchy@iap.fr
2 Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
3 Laboratoire d'Astrophysique de Marseille, CNRS UMR 6110, Traverse du Siphon, 13376 Marseille, France
4 Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany
5 School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UK
6 LESIA, CNRS UMR 8109, Observatoire de Paris, 5 place J. Janssen, 92195 Meudon Cedex, France
7 Physikalisches Institut Universität Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
8 Institut d'Astrophysique Spatiale, Université Paris XI, 91405 Orsay, France
9 Instituto de Astrofisica de Canarias, 38200 La Laguna, Tenerife, Spain
10 Observatório Nacional, Rio de Janeiro, RJ, Brazil
11 Institute for Astronomy, University of Vienna, Türkenschanzstr. 17, 1180 Vienna, Austria
12 Institute of Planetary Research, DLR, Rutherfordstr. 2, 12489 Berlin, Germany
13 Research and Scientific Support Department, European Space Agency, ESTEC, 2200 Noordwijk, The Netherlands
14 Observatoire de la Côte d'Azur, Laboratoire Cassiopée, CNRS UMR 6202, BP 4229, 06304 Nice Cedex 4, France
15 Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz, Austria
16 Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, Sart Tilman, Liège 1, Belgium
17 Institute for Geophysics and Meteorology, Köln University, Albertus-Magnus-Platz, 50923 Cologne, Germany
18 Center for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, 10623 Berlin, Germany
19 LUTH, Observatoire de Paris-Meudon, 5 place J. Janssen, 92195 Meudon Cedex, France

Received: 21 January 2008
Accepted: 6 March 2008

Abstract

We report on the spectroscopic transit of the massive hot-Jupiter CoRoT-Exo-2b observed with the high-precision spectrographs SOPHIE and HARPS. By modeling the radial velocity anomaly occurring during the transit due to the Rossiter-McLaughlin (RM) effect, we determine the sky-projected angle between the stellar spin and the planetary orbital axis to be close to zero λ = 7.2 ± 4.5 deg, and we secure the planetary nature of CoRoT-Exo-2b. We discuss the influence of the stellar activity on the RM modeling. Spectral analysis of the parent star from HARPS spectra are presented.

Key words: planetary systems / techniques: radial velocities

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Observations made with SOPHIE spectrograph at Observatoire de Haute Provence, France (PNP.07A.MOUT) and HARPS spectrograph at ESO La Silla Observatory (079.C-0127(F)). The CoRoT space mission, launched on December 27th 2006, has been developed and is operated by CNES, with the contribution of Austria, Belgium, Brasil, ESA, Germany, and Spain.