2010A&A...511A...3G


Query : 2010A&A...511A...3G

2010A&A...511A...3G - Astronomy and Astrophysics, volume 511, A3-3 (2010/2-2)

The thermal emission of the young and massive planet CoRoT-2b at 4.5 and 8 µm.

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. and SCHNEIDER J.

Abstract (from CDS):

We report measurements of the thermal emission of the young and massive planet CoRoT-2b at 4.5 and 8µm 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 8µm. 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±0.044RJ). We find a small but significant offset in the timing of the occultation when compared to a purely circular orbital solution, leading to e*cosω=-0.00291±0.00063 where e is the orbital eccentricity and ω 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.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - planetary systems - stars: individual: CoRoT-2 - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/511/A3): forsz.dat iracch2.dat iracch4.dat>

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 10069b Pl 01 37 25.0332798696 -45 40 40.374717456           ~ 371 1
2 BD+50 1471b Pl 07 48 06.4723053776 +50 13 32.920598923           ~ 159 1
3 BD+28 2507b Pl 16 02 11.8462322592 +28 10 10.420201452           ~ 184 1
4 TrES-3 Pl 17 52 07.0184259768 +37 32 46.237377840           ~ 230 2
5 TrES-4 Pl 17 53 13.0489562760 +37 12 42.586493328           ~ 215 2
6 Kepler-1b Pl 19 07 14.0375836512 +49 18 59.091482160           ~ 331 2
7 2MASS J19270636+0122577 * 19 27 06.3644409240 +01 22 57.764390916           ~ 7 1
8 CoRoT-2 * 19 27 06.4944378024 +01 23 01.359897468   13.422 12.568 12.204 11.49 G7V+K9V 249 2
9 CoRoT-2b Pl 19 27 06.4944378024 +01 23 01.359897468           ~ 236 1
10 UCAC2 32263617 * 19 27 09.5447916312 +01 23 28.010656644   14.2   11.4   ~ 2 0
11 HD 189733b Pl 20 00 43.7129433648 +22 42 39.073143456           ~ 1440 1
12 HD 209458b Pl 22 03 10.7727465312 +18 53 03.549393384           ~ 1862 1

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