J/AJ/162/211ivo://CDS.VizieR/J/AJ/162/211doi:10.26093/cds/vizier.51620211CDSHill M.L.Kane S.R.Campante T.L.Li Z.Dalba P.A.Brandt T.D.,White T.R.Pope B.J.S.Stassun K.G.Fulton B.J.Corsaro E.Li T.,Ong J.M.J.Bedding T.R.Bossini D.Buzasi D.L.Chaplin W.J.,Cunha M.S.Garcia R.A.Breton S.N.Hon M.Huber D.Jiang C.,Kayhan C.Kuszlewicz J.S.Mathur S.Serenelli A.Stello D.2022-03-14T06:38:23Z2022-01-27T07:40:34ZCDS support team

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

cds-question@unistra.frexoplanetsk-starsradial-velocityvisible-astronomyGiant stars as known exoplanet hosts are relatively rare due to the potential challenges in acquiring precision radial velocities and the small predicted transit depths. However, these giant host stars are also some of the brightest in the sky and so enable high signal-to-noise ratio follow-up measurements. Here, we report on new observations of the bright (V~3.3) giant star {iota}Draconis ({iota}Dra), known to host a planet in a highly eccentric ~511 day period orbit. TESS observations of the star over 137days reveal asteroseismic signatures, allowing us to constrain the stellar radius, mass, and age to ~2%, ~6%, and ~28%, respectively. We present the results of continued radial-velocity monitoring of the star using the Automated Planet Finder over several orbits of the planet. We provide more precise planet parameters of the known planet and, through the combination of our radial-velocity measurements with Hipparcos and Gaia astrometry, we discover an additional long-period companion with an orbital period of ~68_-36_^+60^yr. Mass predictions from our analysis place this substellar companion on the border of the planet and brown dwarf regimes. The bright nature of the star combined with the revised orbital architecture of the system provides an opportunity to study planetary orbital dynamics that evolve as the star moves into the giant phase of its evolution.2021AJ....162..211Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/162/211CatalogResearchIsServedByTAP VizieR generic servicerelated-toIII/150 : Perkins Revised MK Types for the Cooler Stars (Keenan+ 1989)I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)I/337 : Gaia DR1 (Gaia Collaboration, 2016)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/ApJ/757/161 : Spectroscopy of 56 exoplanet host stars (Torres+, 2012)J/A+A/566/A113 : Radial velocity curves of HIP105854 (Jones+, 2014)J/A+A/574/A50 : Chemical abundances of giants and subgiants (Jofre+, 2015)J/A+A/574/A116 : G and K giant stars stellar parameters (Reffert+, 2015)J/A+A/580/A23 : Stroemgren-Crawford uvby{beta} photometry cat. (Paunzen, 2015)J/A+A/588/A87 : Seismic global parameters of 6111 KIC (Vrard+, 2016)J/AJ/152/180 : Bolometric fluxes of eclipsing bin in Tycho-2 (Stassun+, 2016)J/AJ/153/136 : Planets & their host stars Gaia parallaxes (Stassun+, 2017)J/MNRAS/469/4578 : Deep learning classification asteroseismology (Hon+, 2017)J/AJ/155/120 : RV variability of the K-giant {gamma} Draconis (Hatzes+, 2018)J/AJ/156/102 : TESS Input Catalog and Candidate Target List (Stassun+, 2018)J/ApJ/858/28 : Mixing-length parameter for sample of KIC stars (Viani+, 2018)J/AJ/158/13 : The first 300 stars observed by the GPIES (Nielsen+, 2019)J/AJ/158/181 : Radial velocities and S-index values for HR 5183 (Blunt+, 2019)J/AJ/158/227 : Asteroseismic parameters of RGB stars (Grunblatt+, 2019)J/PASP/131/C4401 : TESS predicted yield of transits (Dalba+, 2019)J/AJ/159/235 : Radial Velocity jitters in ~600 planet host stars (Luhn+, 2020)J/AJ/159/241 : TESS-Keck Survey. I. HD332231 Radial Velocities (Dalba+, 2020)J/ApJS/254/42 : Hipparcos-Gaia (EDR3) Catalog of Accelerations (Brandt, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/162/211https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/162/211http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/162/211https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/162/211https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/162/211http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/162/211GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/162/211/table1Radial Velocity Observations of {iota}DraTelTelescope; AFPmeta.id;instr.telcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[2458156/2459254] Barycentric Julian Date at TDBdtime.epochdoubleRVel[-250/390] Radial velocitym/sphys.veloc;pos.heliocentricdoublee_RVel[1/8] Uncertainty in RVelm/sstat.error;spect.dopplerVelocdouble