J/A+A/631/A136ivo://CDS.VizieR/J/A+A/631/A136doi:10.26093/cds/vizier.36310136CDSLuque R.Trifonov T.Reffert S.Quirrenbach A.Lee M.H.Albrecht S.,Fredslund Andersen M.Antoci V.Grundahl F.Schwab C.Wolthoff V.2019-11-06T06:54:22Z2019-11-06T07:34:57ZCDS support team

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

cds-question@unistra.frmultiple-starsexoplanetsradial-velocityWe report the discovery of a second planet orbiting the K giant star 7 CMa based on 166 high-precision radial velocities obtained with Lick, HARPS, UCLES and SONG. The periodogram analysis reveals two periodic signals of approximately 745 and 980d, associated to planetary companions. A double-Keplerian orbital fit of the data reveals two Jupiter-like planets with minimum masses M_b_sini~1.9Mj and M_c_sini~0.9Mj, orbiting at semi-major axes of a_b_~1.75au and a_c_~2.15au, respectively. Given the small orbital separation and the large minimum masses of the planets close encounters may occur within the time baseline of the observations, thus, a more accurate N-body dynamical modeling of the available data is performed. The dynamical best-fit solution leads to collision of the planets and we explore the long-term stable configuration of the system in a Bayesian framework, confirming that 13% of the posterior samples are stable for at least 10Myr. The result from the stability analysis indicates that the two-planets are trapped in a low-eccentricity 4:3 mean-motion resonance. This is only the third discovered system to be inside a 4:3 resonance, making it very valuable for planet formation and orbital evolution models.2019A&A...631A.136Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/631/A136CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/631/A136https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/631/A136http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/631/A136https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/631/A136https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/631/A136http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/631/A136GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/631/A136/table17 CMa radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date of observationdtime.epochdoubleRVRadial velocity (1)m/sphys.veloc;pos.heliocentricfloate_RVRadial velocity uncertaintym/sstat.errorfloatInstInstrumentmeta.id;instrchar