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J/A+A/511/A3   Light curves of CoRoT-2 in z-band, 4.5um and 8um  (Gillon+, 2010)

The thermal emission of the young and massive planet CoRoT-2b at 4.5 and 8um. Gillon M., Lanotte A.A., Barman T., Miller N., Demory B.-O., Deleuil M., Montalban J., Bouchy F., Collier Cameron A., Deeg H.J., Fortney J.J., Fridlund M., Harrington J., Magain P., Moutou C., Queloz D., Rauer H., Rouan D., Schneider J. <Astron. Astrophys. 511, A3 (2010)> =2010A&A...511A...3G
ADC_Keywords: Binaries, eclipsing ; Planets ; Magnitudes Keywords: binaries: eclipsing - planetary systems - stars: individual: CoRoT-2 - techniques: photometric Abstract: We report measurements of the thermal emission of the young and massive planet CoRoT-2b at 4.5 and 8um with the Spitzer Infrared Array Camera (IRAC). Our measured occultation depths are 0.510±0.042% at 4.5 and 0.41±0.11% at 8um. In addition to the CoRoT optical measurements, these planet/star flux ratios indicate a poor heat distribution on the night side of the planet and agree better with an atmosphere free of temperature inversion layer. Still, such an inversion is not definitely ruled out by the observations and a larger wavelength coverage is required to remove the current ambiguity. Our global analysis of CoRoT, Spitzer, and ground-based data confirms the high mass and large size of the planet with slightly revised values (Mp=3.47±0.22MJ, Rp=1.466±0.044 RJ). We find a small but significant offset in the timing of the occultation when compared to a purely circular orbital solution, leading to e*cos(omega)=-0.00291±0.00063 where e is the orbital eccentricity and omega is the argument of periastron. Constraining the age of the system to at most a few hundred Myr and assuming that the non-zero orbital eccentricity does not come from a third undetected body, we modeled the coupled orbital-tidal evolution of the system with various tidal Q values, core sizes, and initial orbital parameters. For Qs'=105-106, our modeling is able to explain the large radius of CoRoT-2b if Qp'≤105.5 through a transient tidal circularization and corresponding planet tidal heating event. Under this model, the planet will reach its Roche limit within 20Myr at most. Description: Photometric time series obtained for CoRoT-2 with the VLT/FORS2 camera in z band during a transit of the planet CoRoT-2b and with the SST/IRAC camera at 4.5 and 8um during an occultation of the same planet. Objects: -------------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------------- 19 27 06.5 +01 23 01 CoRoT-2 = GSC 00465-01282 -------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file forsz.dat 45 399 VLT/FORS2 photometric time series iracch2.dat 101 865 IRAC 4.5um photometric time series iracch4.dat 63 1348 IRAC 8um photometric time series
See also: B/corot : CoRoT observation log Release 4 (CoRoT, 2009) Byte-by-byte Description of file: forsz.dat
Bytes Format Units Label Explanations
1- 15 F15.7 d HJD Heliocentric Julian Date 17- 25 F9.7 --- Flux Flux in z-band 27- 35 F9.7 --- e_Flux Error on flux 37- 45 F9.7 --- Airmass Airmass
Byte-by-byte Description of file: iracch2.dat
Bytes Format Units Label Explanations
1- 18 F18.10 d HJD Heliocentric Julian Date 20- 38 F19.17 --- Flux Flux at 4.5um 40- 63 E24.18 --- e_Flux Error on Flux 65- 82 F18.14 pix Xpos X-position of the PSF centroid on the chip 84-101 F18.14 pix Ypos Y-position of the PSF centroid on the chip
Byte-by-byte Description of file: iracch4.dat
Bytes Format Units Label Explanations
1- 18 F18.10 d HJD Heliocentric Julian Date 20- 38 F19.17 --- Flux Flux at 8um 40- 63 E24.18 --- e_Flux Error on Flux
Acknowledgements: Michael Gillon,
(End) Patricia Vannier [CDS] 29-Dec-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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