Bibcode
Pallé, E.; Chen, G.; Alonso, R.; Nowak, G.; Deeg, H.; Cabrera, J.; Murgas, F.; Parviainen, H.; Nortmann, L.; Hoyer, S.; Prieto-Arranz, J.; Nespral, D.; Cabrera Lavers, A.; Iro, N.
Bibliographical reference
Astronomy and Astrophysics, Volume 589, id.A62, 5 pp.
Advertised on:
4
2016
Journal
Citations
9
Refereed citations
7
Description
Context. The launch of the exoplanet space missions obtaining exquisite
photometry from space has resulted in the discovery of thousands of
planetary systems with very different physical properties and
architectures. Among them, the exoplanet CoRoT-29b was identified in the
light curves the mission obtained in summer 2011, and presented an
asymmetric transit light curve, which was tentatively explained via the
effects of gravity darkening. Aims: Transits of CoRoT-29b are
measured with precision photometry, to characterize the reported
asymmetry in their transit shape. Methods: Using the OSIRIS
spectrograph at the 10-m GTC telescope, we perform spectro-photometric
differential observations, which allow us to both calculate a
high-accuracy photometric light curve, and a study of the
color-dependence of the transit. Results: After careful data
analysis, we find that the previously reported asymmetry is not present
in either of two transits, observed in July 2014 and July 2015 with high
photometric precisions of 300 ppm over 5 min. Due to the relative
faintness of the star, we do not reach the precision necessary to
perform transmission spectroscopy of its atmosphere, but we see no signs
of color-dependency of the transit depth or duration.
Conclusions: We conclude that the previously reported asymmetry may have
been a time-dependent phenomenon, which did not occur in more recent
epochs. Alternatively, instrumental effects in the discovery data may
need to be reconsidered.
Light curves are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr
(ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/589/A62