J/AJ/167/109ivo://CDS.VizieR/J/AJ/167/109doi:10.26093/cds/vizier.51670109CDSPage E.Pepper J.Wright D.Rodriguez J.E.Wittenmyer R.A.Kane S.R.,Addison B.Bedding T.Bowler B.P.Barclay T.Collins K.A.Evans P.,Horner J.Jensen E.L.N.Johnson M.C.Kielkopf J.Mireles I.,Plavchan P.Quinn S.N.Seager S.Shporer A.Stassun K.G.Striegel S.,Winn J.N.Zhou G.Ziegler C.2024-11-06T20:19:23Z2024-05-28T07:51:36ZCDS support team

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

cds-question@unistra.frexoplanetsbrown-dwarfsvisible-astronomyspectroscopyradial-velocityWe present the discovery of TOI-1994b, a low-mass brown dwarf transiting a hot subgiant star on a moderately eccentric orbit. TOI-1994 has an effective temperature of 7700_-410_^+720^K, Vmagnitude of 10.51mag and logg of 3.982_-0.065_^+0.067^. The brown dwarf has a mass of 22.1_-2.5_^+2.6^MJup, a period of 4.034days, an eccentricity of 0.341_-0.059_^+0.054^}, and a radius of 1.220_-0.071_^+0.082^RJup. TOI-1994b is more eccentric than other transiting brown dwarfs with similar masses and periods. The population of low-mass brown dwarfs may have properties similar to planetary systems if they were formed in the same way, but the short orbital period and high eccentricity of TOI-1994b may contrast this theory. An evolved host provides a valuable opportunity to understand the influence stellar evolution has on the substellar companion's fundamental properties. With precise age, mass, and radius, the global analysis and characterization of TOI-1994b augments the small number of transiting brown dwarfs and allows the testing of substellar evolution models.2024AJ....167..109Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/167/109CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)J/ApJ/640/1051 : 25pc sample of Sun-like stars (Grether+, 2006)J/ApJ/718/1353 : Light curve of the triple system NLTT 41135 (Irwin+, 2010)J/A+A/525/A95 : Search for brown-dwarf companions of stars (Sahlmann+, 2011)J/AJ/156/140 : 4 eclipsing mid M-dwarf systems from MEarth (Irwin+, 2018)J/AJ/156/102 : TESS Input Catalog & Candidate Target List (Stassun+, 2018)J/MNRAS/485/2380 : Gaia-derived luminosities Kepler A/F stars (Murphy+, 2019)J/AJ/161/97 : Radial Velocities of TOI-811 and TOI-852 (Carmichael+, 2021)J/A+A/652/A127 : 13-150MJup eclipsing bins transiting comp. (Grieves+, 2021)J/ApJS/254/39 : Exoplanet candidates from TESS 1st 2yr obs (Guerrero+, 2021)J/A+A/645/A7 : Determining mass of RV exoplanets with Gaia (Kiefer+, 2021)J/AJ/162/176 : The solar neighborhood. XLVIII. (Paredes+, 2021)J/A+A/664/A94 : 8 TOI RV curves and 2 TOI light curves (Psaridi+, 2022)J/AJ/165/268 : Radial velocity & rotation period HIP33069b (Vowell+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/167/109https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/167/109http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/167/109https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/167/109https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/167/109http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/167/109GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/167/109/table1Radial velocity observations of TOI-1994recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[9370/9655] Barycentric Julian Date, BJD at TDB-2450000.0dtime.epochdoubleRVel[-3742/3112] Radial velocitym.s**-1spect.dopplerVelocinte_RVel[228/1565] Uncertainty in RVelm.s**-1stat.error;spect.dopplerVelocintInstInstrument used (CHIRON or MINERVA)instr.setupchar