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Searching for the secondary eclipse of CoRoT-Exo-2b and its transit timing variations

Published online by Cambridge University Press:  01 May 2008

Roi Alonso ,
Suzanne Aigrain ,
Frédéric Pont  and
Tsevi Mazeh
Roi Alonso
Affiliation:
Laboratoire d'Astrophysique de Marseille (UMR 6110), Technopole de Marseille-Etoile, F-13388 Marseille cedex 13 (France) email: roi.alonso@oamp.fr
Suzanne Aigrain
Affiliation:
School of Physics, University of Exeter, Stocker Road, Exeter EX44QL, United Kingdom
Frédéric Pont
Affiliation:
School of Physics, University of Exeter, Stocker Road, Exeter EX44QL, United Kingdom
Tsevi Mazeh
Affiliation:
School of Physics and Astonomy, R. and B. Sackler Faculty of Exact SciencesTel Aviv University, Tel Aviv 69978, Israel
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Abstract

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With more than 80 transits observed in the CoRoT lightcurve with a cadence of 32 s, CoRoT-Exo-2b provides an excellent case to search for the secondary eclipse of the planet, with an expected signal of less than 10−4 in relative flux. The activity of the star causes a modulation on the flux that makes the detection of this signal challenging. We describe the technique used to seek for the secondary eclipse, that leads to a tentative 2.5σ detection of a 5.5×10−5 eclipse. If the effect of the spots are not taken into account, the times of transit centers will also be affected. They could lead to an erroneous detection of periodic transit timing variations of ~20 s and with a 7.45 d period. By measuring the transit central times at different depths of the transit (transit bisectors), we show that there are no such periodic variations in the CoRoT-Exo-2b O-C residuals larger than ~10 s.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S253: Transiting Planets , May 2008 , pp. 91 - 96
Copyright
Copyright © International Astronomical Union 2009

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