Three short-period Jupiters from TESS

HIP 65Ab, TOI-157b, and TOI-169b

¹ Geneva Observatory, University of Geneva, Chemin des Mailettes 51, 1290 Versoix, Switzerland
e-mail: louise.nielsen@unige.ch
² Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Av. Diagonal las Torres 2640, Peñalolén, Santiago, Chile
³ Millennium Institute for Astrophysics, Chile
⁴ Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
⁵ Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, MA 02139, USA
⁶ NSF Graduate Research Fellow, Steward Observatory, University of Arizona, Tucson, AZ 85721, USA
⁷ Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
⁸ Department of Earth, Atmospheric and Planetary Sciences, MIT, Cambridge, MA 02139, USA
⁹ Department of Aeronautics and Astronautics, MIT, Cambridge, MA 02139, USA
¹⁰ Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USA
¹¹ NASA Ames Research Center, Moffett Field, CA 94035, USA
¹² Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UK
¹³ NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771, USA
¹⁴ University of Maryland, Baltimore County, 1000 Hilltop Cir, Baltimore, MD 21250, USA
¹⁵ Astrobiology Research Unit, Université de Liège, 19C Allée du 6 Août, 4000 Liège, Belgium
¹⁶ Oukaimeden Observatory, High Energy Physics and Astrophysics Laboratory, Cadi Ayyad University, Marrakech, Morocco
¹⁷ Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile
¹⁸ Dept. of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
¹⁹ Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
²⁰ Caltech IPAC – NASA Exoplanet Science Institute 1200 E. California Ave, Pasadena, CA 91125, USA
²¹ George Mason University, 4400 University Drive, Fairfax, VA 22030, USA
²² Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489 Berlin, Germany
²³ Physics Department and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing 100084, PR China
²⁴ Centre for Astrophysics, University of Southern Queensland, Toowoomba 4350, Australia
²⁵ Max-Planck-Institut für Astronomie, Königstuhl 17, Heidelberg 69117, Germany
²⁶ Space Sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, 19C Allée du 6 Août, 4000 Liège, Belgium
²⁷ Departamento de Astronomía, Universidad de Chile, Camino El Observatorio 1515, Las Condes, Santiago, Chile
²⁸ Centro de Astrofísica y Tecnologías Afines (CATA), Casilla 36-D, Santiago, Chile
²⁹ Department of Physics and Astronomy, University of Louisville, Louisville, KY 40292, USA
³⁰ Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3255, USA
³¹ Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, 8042 Graz, Austria
³² The University of Tokyo, 7-3-1 Hongo, Bunkyō, Tokyo 113-8654, Japan
³³ Instituto de Astronomía, Universidad Católica del Norte, Angamos 0610, Antofagasta 1270709, Chile
³⁴ Astrobiology Center, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
³⁵ JST, PRESTO, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
³⁶ National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
³⁷ Instituto de Astrofisica de Canarias (IAC), 38205 La Laguna, Tenerife, Spain
³⁸ Komaba Institute for Science, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan
³⁹ Las Campanas Observatory, Carnegie Institution of Washington, Colina el Pino, Casilla 601 La Serena, Chile
⁴⁰ Institute for Computational Science, University of Zurich, Winterthurerstr. 190, 8057 Zurich, Switzerland
⁴¹ Hazelwood Observatory, Australia
⁴² Perth Exoplanet Survey Telescope, Perth, Western Australia, Australia
⁴³ NASA Sagan Fellow, Department of Astronomy, Unversity of Texas at Austin, Austin, TX, USA
⁴⁴ Mt. Stuart Observatory, New Zealand
⁴⁵ Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, Ontario M5S 3H4, Canada

Received: 12 March 2020
Accepted: 28 May 2020

Abstract

We report the confirmation and mass determination of three hot Jupiters discovered by the Transiting Exoplanet Survey Satellite (TESS) mission: HIP 65Ab (TOI-129, TIC-201248411) is an ultra-short-period Jupiter orbiting a bright (V = 11.1 mag) K4-dwarf every 0.98 days. It is a massive 3.213 ± 0.078 M_J planet in a grazing transit configuration with an impact parameter of b = 1.17_−0.08^+0.10. As a result the radius is poorly constrained, 2.03_−0.49^+0.61R_J. The planet’s distance to its host star is less than twice the separation at which it would be destroyed by Roche lobe overflow. It is expected to spiral into HIP 65A on a timescale ranging from 80 Myr to a few gigayears, assuming a reduced tidal dissipation quality factor of Q_s^′ = 10⁷ − 10⁹. We performed a full phase-curve analysis of the TESS data and detected both illumination- and ellipsoidal variations as well as Doppler boosting. HIP 65A is part of a binary stellar system, with HIP 65B separated by 269 AU (3.95 arcsec on sky). TOI-157b (TIC 140691463) is a typical hot Jupiter with a mass of 1.18 ± 0.13 M_J and a radius of 1.29 ± 0.02 R_J. It has a period of 2.08 days, which corresponds to a separation of just 0.03 AU. This makes TOI-157 an interesting system, as the host star is an evolved G9 sub-giant star (V = 12.7). TOI-169b (TIC 183120439) is a bloated Jupiter orbiting a V = 12.4 G-type star. It has a mass of 0.79 ±0.06 M_J and a radius of 1.09_−0.05^+0.08R_J. Despite having the longest orbital period (P = 2.26 days) of the three planets, TOI-169b receives the most irradiation and is situated on the edge of the Neptune desert. All three host stars are metal rich with [Fe / H] ranging from 0.18 to0.24.