J/A+A/589/A62 GTC transit light curves of CoRoT-29b (Palle+, 2016)
The GTC exoplanet transit spectroscopy survey.
III. No asymmetries in the transit of Corot-29b.
Palle 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.
<Astron. Astrophys. 589, A62 (2016)>
=2016A&A...589A..62P 2016A&A...589A..62P (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Spectroscopy
Keywords: planets and satellites: atmospheres - planet-star interactions -
extraterrestrial intelligence - astrobiology - eclipses -
techniques: spectroscopic
Abstract:
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.
Here we use the OSIRIS spectrograph at the 10-m GTC telescope to
measure with high precision the transit light curve of CoRoT-29b to
characterize the reported asymmetry in its transit shape.
To this end, 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.
After careful data analysis, we find that there is no asymmetry in the
transit of CoRoT-29b, in either of the two observed transits,
separated by one calendar year. 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.
We conclude that the previously reported asymmetry is a time-dependent
phenomenon which did not occur in more recent epochs, or possible
instrumental effects in the discovery data need to be reconsidered.
Description:
2 transit light curves of the hot Jupiter CoRoT-29b obtained on the
nights of 2014/7/31 and 2015/7/8 using the OSIRIS instrument at the
10.4-m GTC telescope. The light curves have been integrated over the
bandpass of 515-915nm, where the wavelength range of 755-765 nm has
been excluded due to presence of strong telluric O2 absorption.
Objects:
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RA (2000) DE Designation(s)
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18 35 36.505 +06 28 46.74 CoRoT-29 = 2MASS J18353650+0628467
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
gtc_lc1.dat 32 65 CoRoT-29 GTC transit light curve (2014/07/31)
gtc_lc2.dat 32 48 CoRoT-29 GTC transit light curve (2015/07/08)
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Byte-by-byte Description of file: gtc_lc1.dat gtc_lc2.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD Barycentric Julian Date (TDB standard)
16- 23 F8.6 --- CFlux Corrected relative flux
25- 32 F8.6 --- e_CFlux Corrected relative flux error
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Acknowledgements:
Guo Chen, gchen(at)iac.es
(End) Guo Chen [IAC], Patricia Vannier [CDS] 14-Apr-2016