J/A+A/614/A133ivo://CDS.VizieR/J/A+A/614/A133doi:10.26093/cds/vizier.36140133CDSDelisle J.-B.Segransan D.Dumusque X.Diaz R.F.Bouchy F.Lovis C.,Pepe F.Udry S.Alonso R.Benz W.Coffinet A.Collier Cameron A.,Deleuil M.Figueira P.Gillon M.Lo Curto G.Mayor M.Mordasini C.,Motalebi F.Moutou C.Pollacco D.Pompei E.Queloz D.Santos N.C.,Wyttenbach A.2018-09-25T12:11:57Z2018-06-29T12:13:57ZCDS support team

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

cds-question@unistra.frmultiple-starssolar-system-planetsradial-velocityexoplanetsWe report the discovery of four super-earth planets around HD215152, with orbital periods of 5.76, 7.28, 10.86, and 25.2d, and minimum masses of 1.8, 1.7, 2.8, and 2.9M_Earth_ respectively. This discovery is based on 373 high quality radial velocity measurements taken by HARPS over thirteen years. Given the low masses of the planets, the S/N is not sufficient to constrain the planets eccentricities. However, a preliminary dynamical analysis suggests that eccentricities should be typically lower than about 0.03 for the system to remain stable. With two pairs of planets with a period ratio smaller than 1.5, with short orbital periods, small masses, and small eccentricities, HD215152 is similar to the very compact multi-planet systems found by Kepler, and very rare in RV surveys. This discovery proves that those systems are reachable with the RV technique, however they require a huge amount of observations to be characterized.2018A&A...614A.133Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/614/A133CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/614/A133https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/614/A133http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/614/A133https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/614/A133https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/614/A133http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/614/A133GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/614/A133/harps_bHARPS measurements of HD215152 taken after the fiber upgraderecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date of observation (BJD-2400000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVRadial velocity uncertaintykm/sstat.errordoublelogRhkActivity indicator based on CaII HKphot.flux;arith.ratiofloate_logRhkUncertainty in the log(R'hk) measurementstat.errorfloatJ/A+A/614/A133/harps_aHARPS measurements of HD215152 taken before the fiber upgraderecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date of observation (BJD-2400000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVRadial velocity uncertaintykm/sstat.errordoublelogRhkActivity indicator based on CaII HKphot.flux;arith.ratiofloate_logRhkUncertainty in the log(R'hk) measurementstat.errorfloat