J/A+A/598/A26ivo://CDS.VizieR/J/A+A/598/A26doi:10.26093/cds/vizier.35980026CDSPerger M.Garcia-Piquer A.Ribas I.Morales J.C.Affer L.Micela G.,Damasso M.Suarez-Mascareno A.Gonzalez-Hernandez J.I.Rebolo R.,Herrero E.Rosich A.Lafarga M.Bignamini A.Sozzetti A.Claudi R.,Cosentino R.Molinari E.Maldonado J.Maggio A.Lanza A.F.Poretti E.,Pagano I.Desidera S.Gratton R.Piotto G.Bonomo A.S.,Martinez Fiorenzano A.F.Giacobbe P.Malavolta L.Nascimbeni V.,Rainer M.Scandariato G.2017-07-03T13:52:10Z2017-06-16T14:34:33ZCDS support team

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

cds-question@unistra.frsurveysspectroscopym-starsradial-velocityThe distribution of exoplanets around low-mass stars is still not well understood. Such stars, however, present an excellent opportunity for reaching down to the rocky and habitable planet domains. The number of current detections used for statistical purposes remains relatively modest and different surveys, using both photometry and precise radial velocities, are searching for planets around M dwarfs. Our HARPS-N red dwarf exoplanet survey is aimed at the detection of new planets around a sample of 78 selected stars, together with the subsequent characterization of their activity properties. Here we investigate the survey performance and strategy. From 2700 observed spectra, we compare the radial velocity determinations of the HARPS-N DRS pipeline and the HARPS-TERRA code, calculate the mean activity jitter level, evaluate the planet detection expectations, and address the general question of how to define the strategy of spectroscopic surveys in order to be most efficient in the detection of planets. We find that the HARPS-TERRA radial velocities show less scatter and we calculate a mean activity jitter of 2.3m/s for our sample. For a general radial velocity survey with limited observing time, the number of observations per star is key for the detection efficiency. In the case of an early M-type target sample, we conclude that approximately 50 observations per star with exposure times of 900s and precisions of approximately 1m/s maximizes the number of planet detections.2017A&A...598A..26Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/598/A26CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/593/A117 : Paper I. GJ 3998 RVs, S and Halpha indexes (Affer+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/598/A26https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/598/A26http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/598/A26https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/598/A26https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/598/A26http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/598/A26GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/598/A26/table2 (Characteristics of our target stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/598/A26/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/598/A26/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/598/A26/table2?GETtext/xml+votable180.050000true259.002657511.05766940.0055555555555555566/307 826 870 1212 1530 1676 1791 1845 1896 2737 2747 3031 3163 3266 3626 3658 3682 3715 3751 3766 4015 5207 5534 6883 6924 7725 7940 8733 8739 8915 9578 9681 10146 10149 10225 10464 10683 12795 12814 13157 13165 13175 13182 13262 13556 13729 13883 13912 14019 14277 14306 15052 15960 16086 18195 19466 19559 19776 20109 20311 23765 26821 27734 28223 28343 28494 28646 30429 30625 30893 31229 32052 32234 32259 32319 32335https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/598/A26?format=asciiOpticaldefaultJ/A+A/598/A26/table2Characteristics of our target starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameTarget namemeta.id;meta.maincharNobsNumber of observationsmeta.numberintSpTypeSpectral typesrc.spTypecharMStellar masssolMassphys.massfloate_M? Stellar mass uncertaintysolMassstat.errorfloatnullableVmagVisual magnitudemagphot.mag;em.opt.VfloatRV? Absolute radial velocity (YABI)km/sphys.veloc;pos.heliocentricfloatnullableRVTrms? rms of TERRA radial velocitiesm/sstat.stdev;spect.dopplerVelocfloatnullablee_RVTMean TERRA radial velocity uncertaintym/sstat.errorfloatRVYrms? rms of YABI radial velocitiesm/sstat.stdev;spect.dopplerVelocfloatnullablee_RVYMean YABI radial velocity uncertaintym/sstat.errorfloatS/N? Signal-to-noise ratio of observationobs.param;obsfloatnullableFlagFlag (1)meta.code.errorcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main