J/ApJ/719/890ivo://CDS.VizieR/J/ApJ/719/890doi:10.26093/cds/vizier.17190890CDSRivera E.J.Laughlin G.Butler R.P.Vogt S.S.Haghighipour N.,Meschiari S.2017-06-29T08:55:44Z2012-07-06T10:35:00ZCDS support team

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

cds-question@unistra.frmultiple-starsradial-velocitysolar-system-planetsContinued radial velocity (RV) monitoring of the nearby M4V red dwarf star GJ 876 with Keck/High Resolution Echelle Spectrograph has revealed the presence of a Uranus-mass fourth planetary companion in the system. The new planet has a mean period of P_e_=126.6 days (over the 12.6-year baseline of the RV observations), and a minimum mass of m_e_sini_e_=12.9+/-1.7M_{earth}_. The detection of the new planet has been enabled by significant improvements to our RV data set for GJ 876. The data have been augmented by 36 new high-precision measurements taken over the past five years. In addition, the precision of all of the Doppler measurements have been significantly improved by the incorporation of a high signal-to-noise template spectrum for GJ 876 into the analysis pipeline. Implementation of the new template spectrum improves the internal rms errors for the velocity measurements taken during 1998-2005 from 4.1m/s to 2.5m/s.2010ApJ...719..890Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/719/890CatalogResearchIsServedByTAP VizieR generic servicerelated-toIII/254 : 2nd Cat. of Radial Velocities with Astrometric Data (Kharchenko+,III/213 : General Catalog of mean radial velocities (Barbier-Brossat+, 2000)III/184 : 3rd Bibliog. Cat. of Stellar Radial Vel. (Barbier-Brossat+, 1994)J/A+A/511/A21 : Radial velocities of GJ876 planetary system (Correia+, 2010)J/ApJ/693/1084 : Ten new and updated multiplanet systems (Wright+, 2009)J/ApJ/646/505 : Catalog of nearby exoplanets (Butler+, 2006)J/ApJ/634/625 : Radial velocities and photometry of GJ 876 (Rivera+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/719/890https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/719/890http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/719/890https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/719/890https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/719/890http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/719/890GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/719/890/table1Measured velocities for GJ 876 (Keck)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Datedtime.epochdoubleRVRadial velocitym/sphys.veloc;pos.heliocentricfloate_RVUncertainty in RVm/sstat.errorfloat