J/A+A/674/A43ivo://CDS.VizieR/J/A+A/674/A43doi:10.26093/cds/vizier.36740043CDSUlmer-Moll S.Osborn H.P.Tuson A.Egger J.A.Lendl M.Maxted P.,Bekkelien A.Simon A.E.Olofsson G.Adibekyan V.Alibert Y.,Bonfanti A.Bouchy F.Brandeker A.Fridlund M.Gandolfi D.,Mordasini C.Persson C.M.Salmon S.Serrano L.M.Sousa S.G.,Wilson T.G.Rieder M.Hasiba J.Asquier J.Sicilia D.Walter I.,Alonso R.Anglada G.Barrado y Navascues D.Barros S.C.C.,Baumjohann W.Beck M.Beck T.Benz W.Billot N.Bonfils X.,Borsato L.Broeg C.Barczy T.Cabrera J.Charnoz S.Cointepas M.,Collier Cameron A.Csizmadia Sz.Cubillos P.E.Davies M.B.Deleuil M.,Deline A.Delrez L.Demangeon O.D.S.Demory B.-O.Dumusque X.,Ehrenreich D.Eisner N.L.Erikson A.Fortier A.Fossati L.Gillon M.,Grieves N.Guedel M.Hagelberg J.Helled R.Hoyer S.Isaak K.G.,Kiss L.L.Laskar J.Lecavelier des Etangs A.Lovis C.Magrin D.,Nascimbeni V.Otegi J.Ottensammer R.Pagano I.Palle E.Peter G.,Piotto G.Pollacco D.Psaridi A.Queloz D.Ragazzoni R.Rando N.,Rauer H.Ribas I.Santos N.C.Scandariato G.Smith A.M.S.Steller M.,Szabo G.M.Segransan D.Thomas N.Udry S.Van Grootel V.Venturini J.,Walton N.A.2024-11-06T20:04:47Z2023-06-08T07:39:15ZCDS support team

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

cds-question@unistra.frmultiple-starsexoplanetsdwarf-starsradial-velocityphotometryvisible-astronomyWe report the discovery of a long-period transiting Neptune-mass planet orbiting the G7-type star TOI-5678. Our spectroscopic analysis shows that TOI-5678 is a star with a solar metallicity. The TESS light curve of TOI-5678 presents two transit events separated by almost two years. CHEOPS observed the target as part of its Guaranteed Time Observation (GTO) program. After four non-detections corresponding to possible periods, CHEOPS detected a transit event matching a unique period alias. Follow-up radial velocity observations were carried out with the ground-based high resolution spectrographs CORALIE and HARPS. Joint modelling reveals that TOI-5678 hosts a 47.73 day period planet and we measure an orbital eccentricity consistent with 0 at at 2{sigma}. The planet has a mass of 20(+/-4) Mearth and a radius of 4.91(+/-0.08) Re. Using interior structure modeling, we find that TOI-5678 b is composed of a low-mass core surrounded by a large H/He layer.2023A&A...674A..43Uhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/674/A43CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/674/A43https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/674/A43http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/674/A43https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/674/A43https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/674/A43http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/674/A43GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/674/A43/table1CHEOPS light curve of TOI-5678recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian datedtime.epochdoubleFluxNormalized fluxphot.flux;arith.ratiodoublee_FluxNormalized flux errorstat.error;phot.fluxdoubleInstName of the instrumentmeta.id;instrcharbkcgStandardized backgroundinstr.backgrounddoublesinraSine of the roll anglesrc.orbitaldoublecosraCosine of the roll anglesrc.orbitaldoublesin2raSine of 2*roll anglesrc.orbitaldoublecos2raCosine of 2*roll anglesrc.orbitaldoublesin3raSine of 3*roll anglesrc.orbitaldoublecos3raCosine of 3*roll anglesrc.orbitaldoubleXcenStandardized X centroidpixpos.cartesian.xdoubleYcenStandardized Y centroidpixpos.cartesian.ydoubleJ/A+A/674/A43/table2Radial velocities of TOI-5678BJDBarycentric Julian datedtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRVRadial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVRadial velocity errorkm/sstat.errordoubleFWHMFull width half maximumm/sspect.line.widthdoublee_FWHMFull width half maximum errorm/sstat.error;phys.angSizedoubleHaH{alpha} indexspect.indexdoublee_HaH{alpha} index errorstat.errordoubleInstName of the instrumentmeta.id;instrcharSMW? S indexphot.flux;arith.ratiodoublenullablee_SMW? S index errorstat.errordoublenullable