J/AJ/161/97ivo://CDS.VizieR/J/AJ/161/97doi:10.26093/cds/vizier.51610097CDSCarmichael T.W.Quinn S.N.Zhou G.Grieves N.Irwin J.M.Stassun K.G.,Vanderburg A.M.Winn J.N.Bouchy F.Brasseur C.E.Briceno C.,Caldwell D.A.Charbonneau D.Collins K.A.Colon K.D.Eastman J.D.,Fausnaugh M.Fong W.Furesz G.Huang C.Jenkins J.M.Kielkopf J.F.,Latham D.W.Law N.Lund M.B.Mann A.W.Ricker G.R.Rodriguez J.E.,Schwarz R.P.Shporer A.Tenenbaum P.Wood M.L.Ziegler C.2022-09-30T21:38:51Z2021-05-25T09:47:32ZCDS support team

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

cds-question@unistra.frbrown-dwarfsexoplanetsvisible-astronomyspectroscopyradial-velocityWe report the discovery of two transiting brown dwarfs (BDs), TOI-811b and TOI-852b, from NASA's Transiting Exoplanet Survey Satellite mission. These two transiting BDs have similar masses but very different radii and ages. Their host stars have similar masses, effective temperatures, and metallicities. The younger and larger transiting BD is TOI-811b at a mass of Mb=59.9{+/-}13.0M_J_ and radius of Rb=1.26{+/-}0.06R_J_, and it orbits its host star in a period of P=25.16551{+/-}0.00004days. We derive the host star's age of 93_-29_^+61^Myr from an application of gyrochronology. The youth of this system, rather than external heating from its host star, is why this BD's radius is relatively large. This constraint on the youth of TOI-811b allows us to test substellar mass-radius evolutionary models at young ages where the radius of BDs changes rapidly. TOI-852b has a similar mass at Mb=53.7{+/-}1.4M_J_ but is much older (4 or 8Gyr, based on bimodal isochrone results of the host star) and is also smaller with a radius of Rb=0.83{+/-}0.04R_J_. TOI-852b's orbital period is P=4.94561{+/-}0.00008days. TOI-852b joins the likes of other old transiting BDs that trace out the oldest substellar mass-radius evolutionary models where contraction of the BD's radius slows and approaches a constant value. Both host stars have a mass of M_*_=1.32M{sun}{+/-}0.05 and differ in their radii, Teff, and [Fe/H], with TOI-811 having R_*_=1.27{+/-}0.09R{sun}, Teff=6107{+/-}77K, and [Fe/H]=0.40{+/-}0.09 and TOI-852 having R_*_=1.71{+/-}0.04R{sun}, Teff=5768{+/-}84K, and [Fe/H]=0.33{+/-}0.09. We take this opportunity to examine how TOI-811b and TOI-852b serve as test points for young and old substellar isochrones, respectively.2021AJ....161...97Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/161/97CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/259 : The Tycho-2 Catalogue (Hog+ 2000)IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/ApJS/141/503 : Radial Velocities for 889 late-type stars (Nidever+, 2002)J/A+A/392/215 : The CORALIE survey for extrasolar planets. IX. (Santos+,2002)J/MNRAS/349/757 : Masses, ages and metallicities of F-G dwarfs (Lambert+, 2004)J/A+A/491/889 : CoRoT-Exo-3b observations (Deleuil+, 2008)J/ApJ/687/1264 : Age estimation for solar-type dwarfs (Mamajek+, 2008)J/ApJ/718/1353 : Light curve of the triple system NLTT 41135 (Irwin+, 2010)J/ApJ/757/18 : RVel for 16 hot Jupiter host stars (Albrecht+, 2012)J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)J/ApJ/761/123 : KELT-1 photometry and spectroscopy follow-up (Siverd+, 2012)J/A+A/549/A18 : WASP-30 and J1219-39 light & velocity curves (Triaud+, 2013)J/AJ/153/15 : Photometry and spectroscopy of EPIC 201702477 (Bayliss+,2017)J/ApJ/836/77 : Library of high-S/N optical spectra of FGKM stars (Yee+,2017)J/A+A/613/A63 : Lithium content for 148 Pleiades stars (Bouvier+, 2018)J/ApJ/856/23 : BANYAN. XI. The BANYAN {Sigma} algorithm (Gagne+, 2018)J/AJ/156/140 : 4 new eclipsing mid M-dwarf systems from MEarth (Irwin+,2018)J/AJ/156/102 : TESS Input Catalog and Candidate Target List (Stassun+, 2018)J/AJ/158/38 : Substellar discoveries from Kepler & K2 (Carmichael+, 2019)J/A+A/628/A64 : EPIC 212036875b griz light curves (Persson+, 2019)J/AJ/157/31 : Differential photometry & RVel of HATS-70 (Zhou+, 2019)J/AJ/159/19 : SOAR TESS survey. I. (Ziegler+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/161/97https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/161/97http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/161/97https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/161/97https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/161/97http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/161/97GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/161/97/table4Relative radial velocities of TOI-811 from CHIRON and of TOI-852 from TRES and CORALIErecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTOITarget star identificationmeta.id;meta.maincharBJD[8582/8874] Barycentric Julian Date, TBD; BJD-2450000dtime.epochdoubleInstInstrument used; CHIRON, TRES or CORALIE (1)instr.setupcharRVel[-22141/36734] Radial Velocitym/sphys.veloc;pos.heliocentricinte_RVel[19.9/168] Error on RVelm/sstat.error;phys.velocfloat