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Title:
Transiting exoplanets from the CoRoT space mission. IV. CoRoT-Exo-4b: a transiting planet in a 9.2 day synchronous orbit
Authors:
Aigrain, S.; Collier Cameron, A.; Ollivier, M.; Pont, F.; Jorda, L.; Almenara, J. M.; Alonso, R.; Barge, P.; Bordé, P.; Bouchy, F.; Deeg, H.; de La Reza, R.; Deleuil, M.; Dvorak, R.; Erikson, A.; Fridlund, M.; Gondoin, P.; Gillon, M.; Guillot, T.; Hatzes, A.; Lammer, H.; Lanza, A. F.; Léger, A.; Llebaria, A.; Magain, P.; Mazeh, T.; Moutou, C.; Paetzold, M.; Pinte, C.; Queloz, D.; Rauer, H.; Rouan, D.; Schneider, J.; Wuchter, G.; Zucker, S.
Affiliation:
AA(School of Physics, University of Exeter, Exeter, EX4 4QL, UK ), AB(Sch. Physics and Astronomy, Univ. St Andrews, St Andrews, KY16 9SS, UK), AC(IAS, Université Paris XI, 91405 Orsay, France), AD(School of Physics, University of Exeter, Exeter, EX4 4QL, UK), AE(LAM, Université de Provence, 13388 Marseille, France), AF(IAC, E-38205 La Laguna, Spain), AG(LAM, Université de Provence, 13388 Marseille, France), AH(LAM, Université de Provence, 13388 Marseille, France), AI(IAS, Université Paris XI, 91405 Orsay, France), AJ(IAP, Université Pierre & Marie Curie, 75014 Paris, France), AK(IAC, E-38205 La Laguna, Spain), AL(ON/MCT, 20921-030, Rio de Janeiro, Brazil), AM(LAM, Université de Provence, 13388 Marseille, France), AN(Institute for Astronomy, University of Vienna, 1180 Vienna, Austria), AO(Institute of Planetary Research, DLR, 12489 Berlin, Germany), AP(RSSD, ESA/ESTEC, 2200 Noordwijk, The Netherlands), AQ(RSSD, ESA/ESTEC, 2200 Noordwijk, The Netherlands), AR(Observatoire de Genève, 1290 Sauverny, Switzerland), AS(OCA, CNRS UMR 6202, BP 4229, 06304 Nice Cedex 4, France), AT(Thüringer Landessternwarte, 07778 Tautenburg, Germany), AU(IWF, Austrian Academy of Sciences, 8042 Graz, Austria), AV(INAF - Osservatorio Astrofisico di Catania, 95123 Catania, Italy), AW(IAS, Université Paris XI, 91405 Orsay, France), AX(LAM, Université de Provence, 13388 Marseille, France), AY(IAG, Université de Liège, Liège 1, Belgium), AZ(Sch. Physics and Astronomy, Tel Aviv Univ., Tel Aviv 69978, Israel), BA(LAM, Université de Provence, 13388 Marseille, France), BB(RIU, Universität zu Köln, 50931 Köln, Germany), BC(School of Physics, University of Exeter, Exeter, EX4 4QL, UK), BD(Observatoire de Genève, 1290 Sauverny, Switzerland), BE(Institute of Planetary Research, DLR, 12489 Berlin, Germany; ZAA, TU Berlin, 10623 Berlin, Germany), BF(LESIA, Observatoire de Paris, 92195 Meudon, France), BG(LUTH, Observatoire de Paris, 92195 Meudon, France), BH(Thüringer Landessternwarte, 07778 Tautenburg, Germany), BI(Department Geophysics & Planetary Sciences, Tel Aviv Univ., Tel Aviv 69978, Israel)
Publication:
Astronomy and Astrophysics, Volume 488, Issue 2, 2008, pp.L43-L46 (A&A Homepage)
Publication Date:
09/2008
Origin:
EDP Sciences
Astronomy Keywords:
techniques: photometric, stars: planetary systems, stars: rotation
DOI:
10.1051/0004-6361:200810246
Bibliographic Code:
2008A&A...488L..43A

Abstract

CoRoT, the first space-based transit search, provides ultra-high-precision light curves with continuous time-sampling over periods of up to 5 months. This allows the detection of transiting planets with relatively long periods, and the simultaneous study of the host star's photometric variability. In this Letter, we report the discovery of the transiting giant planet CoRoT-Exo-4b and use the CoRoT light curve to perform a detailed analysis of the transit and determine the stellar rotation period. The CoRoT light curve was pre-processed to remove outliers and correct for orbital residuals and artefacts due to hot pixels on the detector. After removing stellar variability about each transit, the transit light curve was analysed to determine the transit parameters. A discrete autocorrelation function method was used to derive the rotation period of the star from the out-of-transit light curve. We determine the periods of the planetary orbit and star's rotation of 9.20205 ± 0.00037 and 8.87 ± 1.12 days respectively, which is consistent with this being a synchronised system. We also derive the inclination, i = 90.00_-0.085+0.000 in degrees, the ratio of the orbital distance to the stellar radius, a/Rs = 17.36-0.25+0.05, and the planet-to-star radius ratio R_p/R_s=0.1047-0.0022+0.0041. We discuss briefly the coincidence between the orbital period of the planet and the stellar rotation period and its possible implications for the system's migration and star-planet interaction history.

The CoRoT space mission, launched on

December 27th 2006, has been developed and is operated by

CNES, with the contribution of Austria, Belgium, Brazil, ESA,

Germany, and Spain. The first CoRoT data will be available to the

public in February 2009 from the CoRoT archive: http://idoc-corot.ias.u-psud.fr/

Figures 1, 4 and 5 are only available in electronic form at http://www.aanda.org


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