TOI-1259Ab – a gas giant planet with 2.7 per cent deep transits and a bound white dwarf companion
David V. MartinDepartment of Astronomy, The Ohio State University , Columbus, OH 43210, USAKareem El-BadryVedad KunovacSchool of Physics and Astronomy, University of Birmingham , Edgbaston, Birmingham B15 2TT, UKA. H. M. J. TriaudSchool of Physics and Astronomy, University of Birmingham , Edgbaston, Birmingham B15 2TT, UKRuth AngusAmerican Museum of National History , New York, NY 10024, USAJessica BirkyDepartment of Astronomy, University of Washington , Seattle, WA 98105, USADaniel Foreman-MackeyCenter for Computational Astrophysics , Flatiron Institute, New York, NY 10010, USAChristina HedgesBay Area Environmental Research Institute , PO Box 25, Moffett Field, CA, USABenjamin T. MontetSchool of Physics, University of New South Wales, Sydney , NSW 2052, AustraliaSimon J. MurphySydney Institute for Astronomy (SIfA), School of Physics, University of Sydney , NSW 2006, AustraliaA. SanterneCNRS, CNES, LAM, Aix Marseille Univ, Marseille , 13388, FranceKeivan G. StassunDepartment of Physics & Astronomy, Vanderbilt University , Nashville, TN 37235, USAAlexander P. StephanCenter for Cosmology and AstroParticle Physics, The Ohio State University , Columbus, OH 43210, USAJi WangDepartment of Astronomy, The Ohio State University , Columbus, OH 43210, USAPaul BenniActon Sky Portal Private Observatory , Acton, MA 01720, USAV. KrushinskyLaboratory of Astrochemical Research, Ural Federal University , Ekaterinburg, Russia, ul. Mira d. 19, Yekaterinburg 620002, RussiaNikita ChazovAstronomical department, Ural Federal University , Yekaterinburg 620002, RussiaN. MishevskiyCarl ZieglerDepartment of Physics, Engineering and Astronomy, Stephen F. Austin State University , TX 75962, USAAbderahmane SoubkiouOukaimeden Observatory, High Energy Physics and Astrophysics Laboratory, Cadi Ayyad University , Marrakech, 644M+C9G, Oukaimeden, MoroccoZ. BenkhaldounOukaimeden Observatory, High Energy Physics and Astrophysics Laboratory, Cadi Ayyad University , Marrakech, 644M+C9G, Oukaimeden, MoroccoI. BoisseCNRS, CNES, LAM, Aix Marseille Univ, Marseille , 13388, FranceMatthew P. BattleyAstrophysics Group, Keele University , Keele, Staffordshire ST5 5BG, UKN J MillerCentre for Exoplanets and Habitability, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, UKDouglas A. CaldwellNASA Ames Research Center , MS 244-30, Moffett Field, CA 94035, USAKaren CollinsSETI Institute , 189 Bernardo Ave, Suite 200, Mountain View, CA 94043, USAChristopher E. HenzeNASA Ames Research Center , MS 244-30, Moffett Field, CA 94035, USANatalia GuerreroDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USAJon M. JenkinsNASA Ames Research Center , MS 244-30, Moffett Field, CA 94035, USADavid W. LathamHarvard-Smithsonian Center for Astrophysics , 60 Garden St, Cambridge, MA 02138, USAA. LevineDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USAScott McDermottSusan E. MullallySpace Telescope Science Institute, 3700 San Martin Drive , Baltimore, MD 21218, USAG. RickerDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USASara SeagerDepartment of Aeronautics and Astronautics , Massachusetts Institute of Technology, Cambridge, MA 02139, USAAvi ShporerDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USAAndrew VanderburgDepartment of Astronomy, The University of Wisconsin-Madison , Madison, WI 53706, USAR. VanderspekDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USAJoshua N. WinnDepartment of Astrophysical Sciences, 4 Ivy Lane, Princeton University , Princeton, NJ 08544, USA
2021en
ABI
Annotatsiya
ABSTRACT We present TOI-1259Ab, a 1.0RJup gas giant planet transiting a 0.71R⊙ K-dwarf on a 3.48 d orbit. The system also contains a bound white dwarf companion TOI-1259B with a projected distance of ∼1600 au from the planet host. Transits are observed in nine TESS sectors and are 2.7 per cent deep – among the deepest known – making TOI-1259Ab a promising target for atmospheric characterization. Our follow-up radial velocity measurements indicate a variability of semiamplitude $K=71\, \rm m\, s^{-1}$, implying a planet mass of 0.44MJup. By fitting the spectral energy distribution of the white dwarf, we derive a total age of $4.08^{+1.21}_{-0.53}$ Gyr for the system. The K dwarf’s light curve reveals rotational variability with a period of 28 d, which implies a gyrochronology age broadly consistent with the white dwarf’s total age.
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