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. =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 2.09{mu}m. 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{mu}m (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. Objects: ----------------------------------------------- RA (2000) DE Designation(s) ----------------------------------------------- 06 48 19.2 -03 06 08 CoRoT-1 = Corot-Exo-1 ----------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file fors-r.dat 35 103 *103 measurements obtained with VLT/FORS2 R_SPECIAL filter ({lambda}_eff_=655nm, FWHM=165nm) on 2008 February 28 hawki-nb.dat 35 301 *301 measurements obtained with VLT/HAWKI narrow band filter NB2090 ({lambda}_c_=2.095um, width=0.020um) on 2009 January 06 -------------------------------------------------------------------------------- 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). -------------------------------------------------------------------------------- See also: B/corot : CoRoT observation log (CoRoT, 2009) Byte-by-byte Description of file: fors-r.dat hawki-nb.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Acknowledgements: Michael Gillon, Michael.Gillon(at)obs.unige.ch ================================================================================ (End) Patricia Vannier [CDS] 29-May-2009