J/A+A/495/959ivo://CDS.VizieR/J/A+A/495/959doi:10.26093/cds/vizier.34950959CDSBoisse I.Moutou C.Vidal-Madjar A.Bouchy F.Pont F.Hebrard G.,Bonfils X.Croll B.Delfosse X.Desort M.Forveille T.Lagrange A.-M.,Loeillet B.Lovis C.Matthews J.M.Mayor M.Pepe F.Perrier C.,Queloz D.Rowe J.F.Santos N.C.Segransan D.Udry S.2017-06-26T11:50:48Z2009-05-17T06:13:54ZCDS support team

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

cds-question@unistra.frlate-type-starssolar-system-planetsradial-velocityExtra-solar planet search programs require high-precision velocity measurements. They need to study how to disentangle radial-velocity variations due to Doppler motion from the noise induced by stellar activity. We monitored the active K2V star HD 189733 and its transiting planetary companion that has a 2.2-day orbital period. We used the high-resolution spectrograph SOPHIE mounted on the 1.93-m telescope at the Observatoire de Haute-Provence to obtain 55 spectra of HD 189733 over nearly two months. We refined the HD 189733b orbit parameters and put limits on the eccentricity and on a long-term velocity gradient. After subtracting the orbital motion of the planet, we compared the variability of spectroscopic activity indices to the evolution of the radial-velocity residuals and the shape of spectral lines. The radial velocity, the spectral-line profile and the activity indices measured in HeI (5875.62{AA}), Halpha (6562.81{AA}) and the CaII H&K lines (3968.47{AA} and 393 3.66{AA}) show a periodicity around the stellar rotation period and the correlations between them are consistent with a spotted stellar surface in rotation. We used such correlations to correct for the radial-velocity jitter due to stellar activity. This results in achieving high precision on the orbit parameters, with a semi-amplitude K=200.56+/-0.88m/s and a derived planet mass of M_P_=1.13+/-0.03M_{Jup}_.2009A&A...495..959Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/495/959CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/476/1347 : HST/ACS flux time series for HD 189733 (Pont+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/495/959https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/495/959http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/495/959https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/495/959https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/495/959http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/495/959GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/495/959/table1Radial velocity measurements of HD 189733recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Datedtime.epochdoubleHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRVError on radial velocitykm/sstat.errorfloat