J/A+A/506/359 FORS2 and HAWKI photometry of CoRoT-1 (Gillon+, 2009)
VLT transit and occultation photometry for the bloated planet CoRoT-1b.
Gillon M., Demory B.-O., Triaud A.H.M.J., Barman T., Hebb L., Montalban J.,
Maxted P.F.L., Queloz D., Deleuil M., Magain P.
<Astron. Astrophys. 506, 359 (2009)>
=2009A&A...506..359G 2009A&A...506..359G
ADC_Keywords: Binaries, eclipsing ; Planets ; Photometry
Keywords: binaries: eclipsing - planetary systems - stars: individual: CoRoT-1 -
infrared: stars - techniques: photometric -
techniques: radial velocities
Abstract:
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 2.09µm. 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+0.13-0.18M{Jup} and 1.45+0.07-0.13R_{Jup}, confirming
the very low density previously deduced from CoRoT photometry. The
large occultation depth that we measure at 2.09µm
(0.2780.043-0.066% ) 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.
Objects:
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RA (2000) DE Designation(s)
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06 48 19.2 -03 06 08 CoRoT-1 = Corot-Exo-1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fors-r.dat 35 103 *103 measurements obtained with VLT/FORS2
R_SPECIAL filter (λeff=655nm,
FWHM=165nm) on 2008 February 28
hawki-nb.dat 35 301 *301 measurements obtained with VLT/HAWKI
narrow band filter NB2090 (λc=2.095um,
width=0.020um) on 2009 January 06
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Note on fors-r.dat: 114 images were obtained during the run, but 11 of them
were saturated (or close to the saturation) and rejected in our analysis.
Note on hawki-nb.dat: 318 images were obtained, but 17 measurements were
considered as outliers during the reduction and discarded. An error of
0.3% was added quadratically to the theoretical errors to account for
the "jitter" noise (see paper).
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See also:
B/corot : CoRoT observation log (CoRoT, 2009)
Byte-by-byte Description of file: fors-r.dat hawki-nb.dat
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Bytes Format Units Label Explanations
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1- 15 F15.7 d BJD Barycentric Julian date
17- 25 F9.7 --- Flux Flux
27- 35 F9.7 --- e_Flux rms uncertainty on Flux
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Acknowledgements:
Michael Gillon, Michael.Gillon(at)obs.unige.ch
(End) Patricia Vannier [CDS] 29-May-2009