J/A+A/511/A55ivo://CDS.VizieR/J/A+A/511/A55doi:10.26093/cds/vizier.35110055CDSFigueira P.Pepe F.Melo C.H.F.Santos N.C.Lovis C.Mayor M.,Queloz D.Smette A.Udry S.2017-06-29T08:55:47Z2010-04-19T14:51:11ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsradial-velocityWith the advent of high-resolution infrared spectrographs, radial velocity (RV) searches enter into a new domain. As of today, the most important technical question to address is which wavelength reference is the most suitable for high-precision RV measurements. In this work we use atmospheric absorption features as wavelength reference on CRIRES data obtained on two programs and three different targets. We analyzed the data from the TW Hya campaign again, reaching a dispersion of about 6m/s on the RV standard on a time scale of roughly 1 week. We confirm that there is a low-amplitude RV signal on TW Hya itself, with an amplitude roughly 3 times smaller than the one reported at visible wavelengths. We present RV measurements of Gl 86 as well, showing that our approach is capable of detecting the signal induced by a planet and correctly quantifying it. Our data show that CRIRES is capable of reaching an RV precision of less than 10m/s on a time scale of one week. The limitations of this particular approach are discussed, along with the limiting factors on RV precision in the IR in a general way. The implications of this work on the design of future dedicated IR spectrographs are addressed as well.2010A&A...511A..55Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/511/A55CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/511/A55https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/511/A55http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/511/A55https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/511/A55https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/511/A55http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/511/A55GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/511/A55/table2Radial velocity of RV std (HD108309) and TW HyarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJ1Barycentric Julian date : RV std (HD108309)dtime.epochdoubleRV1Barycentric radial velocity : RV std (HD108309)km/sspect.dopplerVelocfloatnoise1Photon noise uncertainty : RV std (HD108309)m/sstat.errorfloatBJ2Barycentric Julian date : TW Hyadtime.epochdoubleRV2Barycentric radial velocity : TW Hyakm/sspect.dopplerVelocfloatnoise2Photon noise uncertainty : TW Hyam/sstat.errorfloatJ/A+A/511/A55/table3Radial velocity of Gl86BJ3Barycentric Julian date: Gl 86dtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRV3Barycentric radial velocity : Gl 86km/sspect.dopplerVelocfloatnoise3Photon noise uncertainty: Gl 86m/sstat.errorfloat