VLT transit and occultation photometry for the bloated planet CoRoT-1b

M. Gillon (1 , 2) , B.-O. Demory (2) , A.H.M.J. Triaud (2) , T. Barman (3) , L. Hebb (4) , J. Montalban (1) , P.F.L. Maxted (5)

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D. Queloz (2) M. Deleuil (6) P. Magain (1) ((1) IAGL Universite de Liege Belgium (2) Observatoire de Geneve Switzerland (3) Lowell Observatory USA (4) School of Physics Astronomy University of St. Andrews UK (5) Astrophysics Group Keele University (6) LAM Marseille France)

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classification 🌌 astro-ph.EP

keywords photometryoccultationplanetcorot-1bfiltermicronstransitabsorbed

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We present VLT eclipse photometry for the giant planet CoRoT-1b. We observed a transit in the R-band filter and an occultation in a narrow filter centered on 2.09 microns. Our analysis of this new photometry and published radial velocities, in combination with stellar-evolutionary modeling, leads to a planetary mass and radius of 1.07 (+0.13,-0.18) M_Jup and 1.45 (+0.07,-0.13) R_Jup, confirming the very low density previously deduced from CoRoT photometry. The large occultation depth that we measure at 2.09 microns (0.278 (+0.043,-0.066) %) is consistent with thermal emission and is better reproduced by an atmospheric model with no redistribution of the absorbed stellar flux to the night side of the planet.

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VLT transit and occultation photometry for the bloated planet CoRoT-1b

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