2010A&A...520A..66B

Query : 2010A&A...520A..66B

2010A&A...520A..66B - Astronomy and Astrophysics, volume 520, A66-66 (2010/9-2)

Transiting exoplanets from the CoRoT space mission. XI. CoRoT-8b: a hot and dense sub-Saturn around a K1 dwarf.

BORDE P., BOUCHY F., DELEUIL M., CABRERA J., JORDA L., LOVIS C., CSIZMADIA S., AIGRAIN S., ALMENARA J.M., ALONSO R., AUVERGNE M., BAGLIN A., BARGE P., BENZ W., BONOMO A.S., BRUNTT H., CARONE L., CARPANO S., DEEG H., DVORAK R., ERIKSON A., FERRAZ-MELLO S., FRIDLUND M., GANDOLFI D., GAZZANO J.-C., GILLON M., GUENTHER E., GUILLOT T., GUTERMAN P., HATZES A., HAVEL M., HEBRARD G., LAMMER H., LEGER A., MAYOR M., MAZEH T., MOUTOU C., PAETZOLD M., PEPE F., OLLIVIER M., QUELOZ D., RAUER H., ROUAN D., SAMUEL B., SANTERNE A., SCHNEIDER J., TINGLEY B., UDRY S., WEINGRILL J. and WUCHTERL G.

Abstract (from CDS):

We report the discovery of CoRoT-8b, a dense small Saturn-class exoplanet that orbits a K1 dwarf in 6.2 days, and we derive its orbital parameters, mass, and radius. We analyzed two complementary data sets: the photometric transit curve of CoRoT-8b as measured by CoRoT and the radial velocity curve of CoRoT-8 as measured by the HARPS spectrometer. We find that CoRoT-8b is on a circular orbit with a semi-major axis of 0.063±0.001AU. It has a radius of 0.57±0.02RJ, a mass of 0.22±0.03MJ, and therefore a mean density of 1.6±0.1g/cm3. With 67% of the size of Saturn and 72% of its mass, CoRoT-8b has a density comparable to that of Neptune (1.76g/cm3). We estimate its content in heavy elements to be 47-63M⊕, and the mass of its hydrogen-helium envelope to be 7-23M⊕. At 0.063AU, the thermal loss of hydrogen of CoRoT-8b should be no more than ∼0.1% over an assumed integrated lifetime of 3Ga.

Abstract Copyright: ∼

Journal keyword(s): planets and satellites: detection - stars: fundamental parameters - techniques: photometric - techniques: spectroscopic - techniques: radial velocities - planets and satellites: fundamental parameters

VizieR on-line data: <Available at CDS (J/A+A/520/A66): lc_white.dat lc_blue.dat lc_green.dat lc_red.dat rv.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 CoRoT-7 * 06 43 49.4690164104 -01 03 46.826642700   12.78 11.73 11.36 10.87 K0V 211 1
2 CoRoT-7b Pl 06 43 49.4690164104 -01 03 46.826642700           ~ 402 1
3 Ross 905b Pl 11 42 11.0933350978 +26 42 23.650782778           ~ 810 1
4 HAT-P-12b Pl 13 57 33.4668726399 +43 29 36.601508739           ~ 176 1
5 HD 149026b Pl 16 30 29.6185771608 +38 20 50.308980864           ~ 351 1
6 HD 149026 PM* 16 30 29.6185771608 +38 20 50.308980864   8.75 8.14     G0IV 235 1
7 NAME Aql Region reg 18 31.1 -02 10           ~ 391 0
8 CoRoT-10 V* 19 24 15.2869439208 +00 44 46.002641280   16.676 15.216 15.48 13.64 K1V 38 1
9 CoRoT-8b Pl 19 26 21.2425572360 +01 25 35.177500524           ~ 53 1
10 CoRoT-8 * 19 26 21.2425572360 +01 25 35.177500524   16.096 14.797 14.267 13.26 K1V 35 1
11 CoRoT-3b Pl 19 28 13.2642131544 +00 07 18.613986132           ~ 137 1
12 BD+47 2936b Pl 19 50 50.2472976936 +48 04 51.101390496           ~ 416 1

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