J/AJ/165/39ivo://CDS.VizieR/J/AJ/165/39CDSFranson K.Bowler B.P.Bonavita M.Brandt T.D.Chen M.Samland M.,Zhang Z.Lueber A.Heng K.Kitzmann D.Wolf T.Jones B.A.Tran Q.H.,Bardalez Gagliuffi D.C.Biller B.Chilcote J.Crepp J.R.Dupuy T.J.,Faherty J.Fontanive C.Groff T.D.Gratton R.Guyon O.,Jensen-Clem R.Jovanovic N.Kasdin N.J.Lozi J.Magnier E.A.,Muzic K.Sanghi A.Theissen C.A.2024-10-23T13:23:44Z2024-01-10T13:50:11ZCDS support team

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

cds-question@unistra.frexoplanetsbrown-dwarfsinfrared-astronomyspectroscopyBenchmark brown dwarf companions with well-determined ages and model- independent masses are powerful tools to test substellar evolutionary models and probe the formation of giant planets and brown dwarfs. Here, we report the independent discovery of HIP21152B, the first imaged brown dwarf companion in the Hyades, and conduct a comprehensive orbital and atmospheric characterization of the system. HIP21152 was targeted in an ongoing high-contrast imaging campaign of stars exhibiting proper-motion changes between Hipparcos and Gaia, and was also recently identified by Bonavita et al. (2022) and Kuzuhara et al. (2022). Our Keck/NIRC2 and SCExAO/CHARIS imaging of HIP21152 revealed a comoving companion at a separation of 0.37" (16au). We perform a joint orbit fit of all available relative astrometry and radial velocities together with the Hipparcos-Gaia proper motions, yielding a dynamical mass of 24_-4_^+6^MJup, which is 1-2{sigma} lower than evolutionary model predictions. Hybrid grids that include the evolution of cloud properties best reproduce the dynamical mass. We also identify a comoving wide-separation (1837" or 7.9x104au) early-L dwarf with an inferred mass near the hydrogen-burning limit. Finally, we analyze the spectra and photometry of HIP21152B using the Saumon & Marley (2008) atmospheric models and a suite of retrievals. The best-fit grid-based models have fsed=2, indicating the presence of clouds, Teff=1400K, and logg=4.5dex. These results are consistent with the object's spectral type of T0{+/-}1. As the first benchmark brown dwarf companion in the Hyades, HIP21152B joins the small but growing number of substellar companions with well-determined ages and dynamical masses.2023AJ....165...39Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/165/39CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)I/345 : Gaia DR2 (Gaia Collaboration, 2018)II/365 : CatWISE2020 catalog (updated version 28-Jan-2021) (Marocco+, 2021)VI/119 : High accuracy computed water line list - BT2 (Barber+, 2006)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)VI/133 : A variationally computed hot NH3 line list - BYTe (Yurchenko+, 2011)J/A+A/331/81 : Hyades membership (Perryman+ 1998)J/A+A/352/555 : Fundamental parameters of stars (Allende Prieto+, 1999)J/other/ARA+A/43.195 : L and T dwarf stars (Kirkpatrick, 2005)J/ApJ/637/1067 : Near-IR spectral classification of T dwarfs (Burgasser+, 2006)J/AJ/132/111 : BV(RI)_C_photometry of 77 Hyades stars (Joner+, 2006)J/A+A/468/1115 : Thorium and argon lines in the visible (Lovis+, 2007)J/AJ/139/2566 : SLoWPoKES catalog (Dhital+, 2010)J/A+A/523/A71 : A and F stars abundances in the Hyades (Gebran+, 2010)J/ApJS/190/100 : NIR proper motion survey using 2MASS (Kirkpatrick+, 2010)J/ApJ/725/331 : Astrometry in the Galactic Center (Yelda+, 2010)J/A+A/531/A92 : Deep all-sky census of the Hyades (Roeser+, 2011)J/ApJS/201/19 : Hawaii Infrared Parallax Program. I. (Dupuy+, 2012)J/A+A/541/A150 : Lithium in M67 and Hyades (Pace+, 2012)J/ApJ/745/174 : Evolutionary model of young gas-giant planets (Spiegel+, 2012)J/ApJ/776/67 : Rotational tracks (van Saders+, 2013)J/ApJ/795/161 : Activity & rotation in Praesepe & the Hyades (Douglas+, 2014)J/MNRAS/440/1649 : ExoMol line lists for CH4 (Yurchenko+, 2014)J/ApJ/804/146 : Atmospheric parameters for nearby B-F stars (David+, 2015)J/ApJ/810/158 : M,L,T dwarfs fundamental parameters & SEDs (Filippazzo+, 2015)J/A+A/589/A21 : K-H2 line shapes for cool brown dwarfs spectra (Allard+, 2016)J/MNRAS/460/4063 : ExoMol line list for H2S AYT2 (Yurchenko+, 2016)J/A+A/585/A7 : Hyades single stars fiducial photometry (Kopytova+, 2016)J/ApJ/833/96 : Hawaii IR parallax program. II. Ultracool dwarfs (Liu+, 2016)J/AJ/153/208 : LCES HIRES/Keck radial vel Exoplanet Survey (Butler+, 2017)J/AJ/153/128 : WOCS. LXXV. Hyades&Praesepe stellar Li data (Cummings+, 2017)J/ApJS/231/15 : Astrometric monitoring ultracool dwarf binaries (Dupuy+, 2017)J/ApJS/234/1 : Catalog of M, L, & T dwarfs from PS13{pi} Survey (Best+, 2018)J/AJ/155/149 : Properties of co-moving stars observed Gaia (Bochanski+, 2018)J/AJ/155/159 : RVs of the late-T dwarf GL 758 B host star (Bowler+, 2018)J/ApJ/862/138 : BANYAN. XIII. Nearby young assoc. with Gaia DR2 (Gagne+, 2018)J/ApJ/856/23 : BANYAN. XI. The BANYAN {Sigma} algorithm (Gagne+, 2018)J/A+A/615/L12 : 2MASS J04183483+2131275 spectrum (Lodieu+, 2018)J/A+A/619/L8 : Ultra-cool dwarfs candidates in Gaia DR2 (Reyle, 2018)J/A+A/616/A7 : Gaia DR2 radial velocity standard stars cat. (Soubiran+, 2018)J/A+A/623/A72 : Binarity of Hipparcos stars Gaia pm anomaly (Kervella+, 2019)J/A+A/623/A35 : A 3D view of the Hyades population (Lodieu+, 2019)J/A+A/621/L3 : Hyades tidal tails with Gaia DR2 (Meingast+, 2019)J/AJ/158/13 : The first 300 stars observed by the GPIES (Nielsen+, 2019)J/A+A/621/L2 : Hyades tidal tails revealed by Gaia DR2 (Roeser+, 2019)J/AJ/159/63 : New AO obs. of exoplanets & brown dwarf comps (Bowler+, 2020)J/ApJ/893/27 : TRENDS high-contrast imaging survey. VIII. (Gonzales+, 2020)J/A+A/639/A47 : SPHERE and NaCo images of HD 19467B (Maire+, 2020)J/ApJS/247/11 : RV photon limits well-characterized F-M stars (Reiners+, 2020)J/AJ/159/174 : Parameters & abundances Hyades/Field GK-dwarfs (Takeda+, 2020)J/AJ/161/42 : Volume-limited cool dwarfs. I. L0-T8 dwarfs (Best+, 2021)J/AJ/161/179 : Predicted positions of {beta}Pictoris b and c (Brandt+, 2021)J/ApJS/254/42 : Hipparcos-Gaia (EDR3) Catalog of Accelerations (Brandt, 2021)J/A+A/649/A6 : Gaia Catalogue of Nearby Stars (Gaia collaboration, 2021)J/A+A/651/A71 : SHINE II (Langlois+, 2021)J/A+A/657/A7 : Stellar & substellar comps from Gaia EDR3 (Kervella+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/165/39https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/165/39http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/165/39https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/165/39https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/165/39http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/165/39GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/AJ/165/39/table32022 february CHARIS spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[1.16/2.37] Wavelengthumem.wlfloatFlux[0.4/2.6] Flux (10^-17^erg/s/cm^2^/{AA})phot.flux.density;em.IRfloate_Flux[0.1/2] Error on Fluxstat.error;phot.fluxfloatJ/AJ/165/39/table11SPHERE/IFS spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda1[0.95/1.64] Reduction 1 wavelengthumem.wlfloatFlux1[0.6/3.08] Reduction 1 Flux (10^-17^erg/s/cm^2^/{AA})phot.flux.density;em.IRfloate_Flux1[0.03/0.5] Error on Flux1stat.errorfloatlambda2[0.98/1.64]? Redction 2 wavelengthumem.wlfloatnullableFlux2[0.65/2.66]? Reduction 2 Flux (10^-17^erg/s/cm^2^/{AA})phot.flux.density;em.IRfloatnullablee_Flux2[0.05/0.6]? Error on Flux2stat.errorfloatnullable