J/AJ/164/97ivo://CDS.VizieR/J/AJ/164/97doi:10.26093/cds/vizier.51640097CDSMacDougall M.G.Petigura E.A.Fetherolf T.Beard C.Lubin J.Angelo I.,Batalha N.M.Behmard A.Blunt S.Brinkman C.Chontos A.,Crossfield I.J.M.Dai F.Dalba P.A.Dressing C.Fulton B.Giacalone S.,Hill M.L.Howard A.W.Huber D.Isaacson H.Kane S.R.Kosiarek M.,Mayo A.Mocnik T.Akana Murphy J.M.Pidhorodetska D.Polanski A.,Rice M.Robertson P.Rosenthal L.J.Roy A.Rubenzahl R.A.Scarsdale N.,Turtelboom E.V.Tyler D.Van Zandt J.Weiss L.M.Esparza-Borges E.,Fukui A.Isogai K.Kawauchi K.Mori M.Murgas F.Narita N.,Nishiumi T.Palle E.Parviainen H.Watanabe N.Jenkins J.M.,Latham D.W.Ricker G.R.Seager S.Vanderspek R.K.Winn J.N.Bieryla A.,Caldwell D.A.Dragomir D.,Fausnaugh M.M.Mireles I.Rodriguez D.R.2025-05-05T20:07:47Z2022-12-01T10:00:33ZCDS support team

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

cds-question@unistra.frexoplanetshigh-velocity-starsvisible-astronomyspectroscopyradial-velocityWe report the discovery of an eccentric hot Neptune and a non-transiting outer planet around TOI-1272. We identified the eccentricity of the inner planet, with an orbital period of 3.3days and Rp,b=4.1{+/-}0.2R{Earth}, based on a mismatch between the observed transit duration and the expected duration for a circular orbit. Using ground-based radial velocity (RV) measurements from the HIRES instrument at the Keck Observatory, we measured the mass of TOI-1272b to be Mp,b=25{+/-}2M{Earth}. We also confirmed a high eccentricity of eb=0.34{+/-}0.06, placing TOI-1272b among the most eccentric well-characterized sub-Jovians. We used these RV measurements to also identify a non-transiting outer companion on an 8.7day orbit with a similar mass of Mp,csin(i)=27{+/-}3M{Earth} and ec<~0.35. Dynamically stable planet-planet interactions have likely allowed TOI-1272b to avoid tidal eccentricity decay despite the short circularization timescale expected for a close-in eccentric Neptune. TOI-1272b also maintains an envelope mass fraction of fenv~11% despite its high equilibrium temperature, implying that it may currently be undergoing photoevaporation. This planet joins a small population of short-period Neptune-like planets within the "Hot Neptune Desert" with a poorly understood formation pathway.2022AJ....164...97Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/164/97CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/ApJ/725/875 : Chromospheric activity for CPS stars (Isaacson+, 2010)J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)J/AJ/154/109 : California-Kepler Survey. III. Planet radii (Fulton+, 2017)J/ApJ/844/102 : KIC star parallaxes from asteroseismology/Gaia (Huber+, 2017)J/AJ/154/107 : California-Kepler Survey. I. 1305 stars (Petigura+, 2017)J/AJ/154/228 : Properties of transiting planet's host stars (Sandford+, 2017)J/AJ/156/147 : RV and activity measurements of Kepler-1656 (Brady+, 2018)J/AJ/155/255 : Radial velocity & activity measurements HAT-P-11 (Yee+, 2018)J/AJ/157/97 : Radial velocity measurements K2-3 & GJ3470 (Kosiarek+, 2019)J/A+A/630/A89 : WASP-12b and WASP-43b griz light curves (Parviainen+, 2019)J/A+A/624/A15 : Kepler-411 mid-transit times (Sun+, 2019)J/AJ/159/280 : Gaia-Kepler stellar properties catalog.I. (Berger+, 2020)J/A+A/644/A127 : LP714-47 (TOI 442) radial velocity curve (Dreizler+, 2020)J/AJ/159/235 : Radial Velocity jitters in 600 planet host stars (Luhn+, 2020)J/A+A/650/A145 : TOI-269 b light curves (Cointepas+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/164/97https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/164/97http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/164/97https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/164/97https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/164/97http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/164/97GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/164/97/table1Radial velocity measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObs[2020/2021] ISO8601 compliant timestamp of observation, yeartime.epochBJD[2458885/2459547] Barycentric Julian date of observation, roundeddtime.epochdoubleInstInstrument used (hires)instr.setupcharRVel[-25.2/23.8] Radial velocitym/sphys.veloc;pos.heliocentricfloate_RVel[1/3] Uncertainty in RVelm/sstat.error;spect.dopplerVelocfloatSHK[0.23/0.46] S-index of the CaII H and K linesspect.indexfloate_SHK[0.001] Uncertainty in SHKstat.errorfloat