J/MNRAS/533/1ivo://CDS.VizieR/J/MNRAS/533/1doi:10.26093/cds/vizier.75330001CDSAlqasim A.Grieves N.Rosario N.M.Gandolfi D.Livingston J.H.,Sousa S.Collins K.A.Teske J.K.Fridlund M.Egger J.A.Cabrera J.,Hellier C.Lanza A.F.Van Eylen V.Bouchy F.Oelkers R.J.Srdoc G.,Shectman S.Guenther M.Goffo E.Wilson T.Serrano L.M.Brandeker A.,Wang S.X.Heitzmann A.Bonfanti A.Fossati L.Alibert Y.Delrez L.,Sefako R.Barros S.Collins K.I.Demangeon O.D.S.Albrecht S.H.,Alonso R.Asquier J.Barczy T.Barrado D.Baumjohann W.Beck T.,Benz W.Billot N.Borsato L.Broeg C.Bryant E.M.Butler R.P.,Cochran W.D.Collier Cameron A.Correia A.C.M.Crane J.D.,Csizmadia Sz.Cubillos P.E.Davies M.B.Daylan T.Deleuil M.Deline A.,Demory B.-O.Derekas A.Edwards B.Ehrenreich D.Erikson A.Essack Z.,Fortier A.Gazeas K.Gillon M.Gudel M.Hasiba J.Hatzes A.P.,Helling C.Hirano T.Howell S.B.Hoyer S.Isaak K.G.Jenkins J.M.,Kanodia S.Kiss L.L.Korth J.Lam K.W.F.Laskar J.,Lecavelier des Etangs A.Lendl M.Lund M.B.Luque R.Mann A.W.,Magrin D.Maxted P.F.L.Mordasini C.Narita N.Nascimbeni V.Nowak G.,Olofsson G.Osborn H.P.Osborne H.L.M.Osip D.Ottensamer R.Pagano I.,Palle E.Peter G.Piotto G.Pollacco D.Queloz D.Ragazzoni R.,Rando N.Rauer H.Redfield S.Ribas I.Rice M.Ricker G.R.Rieder M.,Salmon S.Santos N.C.Scandariato G.Seager S.Segransan D.Shporer A.,Simon A.E.Smith A.M.S.Stalport M.Szabo Gy.M.Thompson I.,Twicken J.D.Udry S.Vanderspek R.Van Grootel V.Venturini J.,Villaver E.Villasenor J.Viotto V.Walter I.Walton N.A.Winn J.N.,Yee S.W.2024-11-06T20:35:34Z2024-08-09T12:16:52ZCDS support team

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

cds-question@unistra.frmultiple-starsk-starsexoplanetsphotometryvisible-astronomyradial-velocityWe report the spectroscopic confirmation and fundamental properties of TOI-757 b, a mini-Neptune on a 17.5-day orbit transiting a bright star (V=9.7mag) discovered by the TESS mission. We acquired high-precision radial velocity measurements with the HARPS, ESPRESSO, and PFS spectrographs to confirm the planet detection and determine its mass. We also acquired space-borne transit photometry with the CHEOPS space telescope to place stronger constraints on the planet radius, supported with ground-based LCOGT photometry. WASP and KELT photometry were used to help constrain the stellar rotation period. We also determined the fundamental parameters of the host star. We find that TOI-757 b has a radius of R_p_=2.5+/-0.1R_{Earth}_ and a mass of M_p_=10.5^+2.2^_-2.1_M_{Earth}_, implying a bulk density of {rho}_p_=3.6+/-0.8g/cm^3^. Our internal composition modeling was unable to constrain the composition of TOI-757 b, highlighting the importance of atmospheric observations for the system. We also find the planet to be highly eccentric with e=0.39^+0.08^_-0.07_, making it one of the very few highly eccentric planets among precisely characterized mini-Neptunes. Based on comparisons to other similar eccentric systems, we find a likely scenario for TOI-757 b's formation to be high eccentricity migration due to a distant outer companion. We additionally propose the possibility of a more intrinsic explanation for the high eccentricity due to star-star interactions during the earlier epoch of the Galactic disk formation, given the low metallicity and older age of TOI-757.2024MNRAS.533....1Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/533/1CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/533/1https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/533/1http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/533/1https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/533/1https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/533/1http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/533/1GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/MNRAS/533/1/rvHARPS, ESPRESSO and PFS radial velocity observations of TOI-757recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeTESS Barycentric Julian Date (BTJD) (BJD - 2457000)dtime.epochdoubleRVRadial velocitym/sphys.veloc;pos.heliocentricdoublee_RVRadial velocity errorm/sstat.errordoubleTelInstrument used: HARPS, ESPRESSO or PFSinstr.setupcharInstId[0/2] Instrument identifier (1)meta.id;instrintCCFBIS? CCF Bisector velocity spanm/sphys.velocdoublenullablee_CCFBIS? CCF Bisector velocity span error = 2*e_RVm/sstat.errordoublenullableCCFFWHM? CCF Full Width at Half Maximumm/sspect.dopplerVelocdoublenullablee_CCFFWHM? CCF Full Width at Half Maximum error = 2*e_RVm/sstat.errordoublenullableSindexS-index (Mt. Wilson)spect.indexdoublee_SindexS-index errorstat.errordoubleHalphaIndex? H-alpha indexphot.color;em.opt.V;em.line.Halphadoublenullablee_HalphaIndex? H-alpha index errorstat.errorcharlogRHK? log (R'/HK) activity indexphot.flux;arith.ratiodoublenullablee_logRHK? log (R'/HK) activity index errorstat.errordoublenullableExpTimeExposure timestime.duration;obs.exposurefloatJ/MNRAS/533/1/photomTESS, CHEOPS and LCOGT photometric observations of TOI-757recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeTESS Barycentric Julian Date (BTJD) (BJD-2457000)dtime.epochdoubleindexedFluxDe-trended relative flux (in ppt)phot.flux.density;em.optdoublee_FluxFlux error (in ppt)stat.error;phot.fluxdoubleTelTelescope used (TESS, CHEOPS, LCO-Y, or LCO-Zs) (1)instr.setupcharTransitIdTransit ID ordered by date (2)meta.id;obsint