J/A+A/520/A66 CoRoT-8b light and RV curves (Borde+, 2010)
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., He'brard G., Lammer H.,
Leger A., Mayor M., Mazeh T., Moutou C., Patzold M., Pepe F.,
Ollivier M., Queloz D., Rauer H., Rouan D., Samuel B., Santerne A.,
Schneider J., Tingley B., Udry S., Weingrill J., Wuchterl G.
<Astron. Astrophys. 520, A66 (2010)>
=2010A&A...520A..66B 2010A&A...520A..66B
ADC_Keywords: Stars, double and multiple ; Planets ; Radial velocities ;
Photometry
Keywords: planets and satellites: detection - stars: fundamental parameters -
techniques: photometric - techniques: spectroscopic -
techniques: radial velocities -
planets and satellites: fundamental parameters
Abstract:
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
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 47-63 Earth masses, and
the mass of its hydrogen-helium envelope to be 7-23 Earth masses. At
0.063AU, the thermal loss of hydrogen of CoRoT-8b should be no more
than about 0.1% over an assumed integrated lifetime of 3Ga.
Description:
Light curves in the CoRoT white, blue, green, and red channels. The
CoRoT bands are not simply related to any standard photometric
systems. Because the applied corrections are channel-specific, the
flux in the white channel is not the exact sum of the blue, green, and
red fluxes. Also provided are the radial velocity measurements by the
SOPHIE and HARPS spectrographs.
Objects:
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RA (2000) DE Designation(s)
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19 26 21.2 +01 25 35 CoRoT-8b = CoRoT-Exo-8b
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lc_white.dat 21 20139 CoRoT-8 light curve by CoRoT (white channel)
lc_blue.dat 21 18594 CoRoT-8 light curve by CoRoT (blue channel)
lc_green.dat 21 18519 CoRoT-8 light curve by CoRoT (green channel)
lc_red.dat 21 18466 CoRoT-8 light curve by CoRoT (red channel)
rv.dat 47 21 CoRoT-8 radial velocity by SOPHIE and HARPS
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See also:
B/corot : CoRoT observation log Release 6 (CoRoT, 2010)
J/A+A/491/889 : CoRoT-Exo-3b observations (Deleuil+, 2008)
J/A+A/506/79 : Asteroseismic analysis of HD 174936 (Garcia Hernandez+, 2009)
J/A+A/506/85 : HD 50844 observed by CoRoT (Poretti+, 2009)
J/A+A/506/95 : Fourier analysis of HD 49330 CoRoT light curve (Huat+, 2009)
J/A+A/506/111 : Frequency analysis of HD 180642 (V1449 Aql) (Degroote+, 2009)
J/A+A/506/143 : Pulsations of HD 181231 (Neiner+, 2009)
J/A+A/506/303 : CoRoT-7 radial velocities (Queloz+, 2009)
J/A+A/511/A3 : Light curves of CoRoT-2 in z-band, 4.5 and 8um (Gillon+, 2010)
J/A+A/510/A39 : CoRoT light curves of V1127 Aql (Chadid+, 2010)
Byte-by-byte Description of file: lc_*.dat
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Bytes Format Units Label Explanations
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1- 14 F14.9 d HJD-2451545 Heliocentric Julian Date (from CoRoT)
16- 21 I6 --- Flux Photometric flux (in e-/32s units)
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Byte-by-byte Description of file: rv.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d BJD Barycentric Julian Date
15- 22 F8.4 km/s RV Radial velocity
24- 29 F6.4 km/s e_RV Radial velocity 1-sigma error
31- 34 I4 s ExpTime Exposure time
36- 40 F5.2 --- SNR S/N per pixel at 550nm
42- 47 A6 --- Spect Spectrograph name
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Acknowledgements:
Pascal Borde, pascal.borde(at)ias.u-psud.fr
References:
Barge et al., Paper I, 2008A&A...482L..17B 2008A&A...482L..17B, CoRoT-Exo-1b
Alonso et al., Paper II, 2008A&A...482L..21A 2008A&A...482L..21A, CoRoT-Exo-2b
Bouchy et al. Paper III, 2008A&A...482L..25B 2008A&A...482L..25B, CoRoT-Exo-2b
Aigran et al., Paper IV, 2008A&A...488L..43A 2008A&A...488L..43A, CoRoT-Exo-4b
Moutou et al. Paper V, 2008A&A...488L..47M 2008A&A...488L..47M, CoRoT-Exo-4b
Deleuil et al. Paper VI, 2008A&A...491..889D 2008A&A...491..889D, CoRoT-Exo-3b, J/A+A/491/889
Rauer et al., Paper VII, 2009A&A...506..281R 2009A&A...506..281R, CoRoT-5b
Leger et al., Paper VIII, 2009A&A...506..287L 2009A&A...506..287L, CoRoT-7b
Fridlund et al., Paper IX, 2010A&A...512A..14F 2010A&A...512A..14F, CoRoT-6b
(End) Pascal Borde [Univ. Paris-Sud, France], Patricia Vannier [CDS] 17-Aug-2010