J/A+A/628/A39ivo://CDS.VizieR/J/A+A/628/A39doi:10.26093/cds/vizier.36280039CDSLuque R.Palle E.Kossakowski D.Dreizler S.Kemmer J.Espinoza N.,Burt J.Anglada-Escude G.Bejar V.J.S.Caballero J.A.Collins K.A.,Collins K.I.Cortes-Contreras M.Diez-Alonso E.Feng F.Hatzes A.,Hellier C.Henning T.Jeffers S.V.Kaltenegger L.Kuerster M.,Madden J.Molaverdikhani K.Montes D.Narita N.Nowak G.Ofir A.,Oshagh M.Parviainen H.Quirrenbach A.Reffert S.Reiners A.,Rodriguez-Lopez C.Schlecker M.Stock S.Trifonov T.Winn J.N.,Zapatero Osorio M.R.Zechmeister M.Amado P.J.Anderson D.R.,Batalha N.E.Bauer F.F.Bluhm P.Burke C.J.Butler R.P.Caldwell D.A.,Chen G.Crane J.D.Dragomir D.Dressing C.D.Dynes S.Jenkins J.M.,Kaminski A.Klahr H.Kotani T.Lafarga M.Latham D.W.Lewin P.,McDermott S.Montanes-Rodriguez P.Morales J.C.Murgas F.Nagel E.,Pedraz S.Ribas I.Ricker G.R.Rowden P.Seager S.Shectman S.A.,Tamura M.Teske J.Twicken J.D.Vanderspeck R.Wang S.X.Wohler B.2019-11-22T13:41:54Z2019-08-06T08:17:20ZCDS support team

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

cds-question@unistra.frmultiple-starsexoplanetsradial-velocityWe report the detection of a transiting Earth-size planet around GJ 357, a nearby M2.5 V star, using data from the Transiting Exoplanet Survey Satellite (TESS). GJ 357 b (TOI-562.01) is a transiting, hot, Earth-sized planet (Teq=525+/-11K) with a radius of R_b_=1.217+/-0.084R_{Earth}_ and an orbital period of P_b_=3.93d. Precise stellar radial velocities from CARMENES and PFS, as well as archival data from HIRES, UVES, and HARPS also display a 3.93-day periodicity, confirming the existence of the planet and leading to a planetary mass of M_b_=1.84+/-0.31M_{Earth}_. In addition to the radial velocity signal for GJ 357 b, more periodicities are present in the data indicating the presence of two more planets in the system: GJ 357 c, with a minimum mass of M_c_=3.40+/-0.46M_{Earth}_ in a 9.12d orbit, and GJ 357 d, with a minimum mass of M_d_=6.1+/-1.0M_{Earth}_ in a 55.7d orbit inside the habitable zone. The host is relatively inactive and exhibits a photometric rotation period of Prot=78+/-2d. GJ 357 b is to date the second closest transiting planet to the Sun, making it a prime target for further investigations such as transmission spectroscopy. Therefore, GJ 357 b represents one of the best terrestrial planets suitable for atmospheric characterization with the upcoming JWST and ground-based ELTs.2019A&A...628A..39Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/628/A39CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/628/A39https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/628/A39http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/628/A39https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/628/A39https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/628/A39http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/628/A39GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/628/A39/table1GJ 357 radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date of observationdtime.epochdoubleRVRadial velocitym/sphys.veloc;pos.heliocentricfloate_RVRadial velocity uncertaintym/sstat.errorfloatInstInstrument (1)meta.id;instrchar