J/A+A/520/A66ivo://CDS.VizieR/J/A+A/520/A66doi:10.26093/cds/vizier.35200066CDSBorde 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.2017-07-03T14:25:25Z2010-10-05T08:05:06ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frmultiple-starssolar-system-planetsradial-velocityphotometryWe 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/cm^3^. With 67% of the size of Saturn and 72% of its mass, CoRoT-8b has a density comparable to that of Neptune (1.76g/cm^3^). 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.2010A&A...520A..66Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/520/A66CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/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)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/520/A66https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/520/A66http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/520/A66https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/520/A66https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/520/A66http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/520/A66GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/520/A66/rvCoRoT-8 radial velocity by SOPHIE and HARPSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Datedtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVRadial velocity 1-sigma errorkm/sstat.errorfloatExpTimeExposure timestime.duration;obs.exposureintSNRS/N per pixel at 550nmstat.snrfloatSpectSpectrograph namemeta.id;instrchar