The Astrophysical Journal Letters (Jan 2023)
TOI-4600 b and c: Two Long-period Giant Planets Orbiting an Early K Dwarf
- Ismael Mireles,
- Diana Dragomir,
- Hugh P. Osborn,
- Katharine Hesse,
- Karen A. Collins,
- Steven Villanueva,
- Allyson Bieryla,
- David R. Ciardi,
- Keivan G. Stassun,
- Mallory Harris,
- Jack J. Lissauer,
- Richard P. Schwarz,
- Gregor Srdoc,
- Khalid Barkaoui,
- Arno Riffeser,
- Kim K. McLeod,
- Joshua Pepper,
- Nolan Grieves,
- Vera Maria Passegger,
- Solène Ulmer-Moll,
- Joseph E. Rodriguez,
- Dax L. Feliz,
- Samuel Quinn,
- Andrew W. Boyle,
- Michael Fausnaugh,
- Michelle Kunimoto,
- Pamela Rowden,
- Andrew Vanderburg,
- Bill Wohler,
- Jon M. Jenkins,
- David W. Latham,
- George R. Ricker,
- Sara Seager,
- Joshua N. Winn
Affiliations
- Ismael Mireles
- ORCiD
- Department of Physics and Astronomy, The University of New Mexico , Albuquerque, NM 87106, USA
- Diana Dragomir
- ORCiD
- Department of Physics and Astronomy, The University of New Mexico , Albuquerque, NM 87106, USA
- Hugh P. Osborn
- ORCiD
- NCCR/PlanetS, Physikalisches Institut, University of Bern , Gesellsschaftstrasse 6, 3012 Bern, Switzerland; Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Katharine Hesse
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Karen A. Collins
- ORCiD
- Center for Astrophysics , Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
- Steven Villanueva
- NASA Goddard Space Flight Center 8800 Greenbelt Rd, Greenbelt, MD 20771, USA
- Allyson Bieryla
- ORCiD
- Center for Astrophysics , Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
- David R. Ciardi
- ORCiD
- NASA Exoplanet Science Institute-Caltech/IPAC , Pasadena, CA 91125, USA
- Keivan G. Stassun
- ORCiD
- Department of Physics and Astronomy, Vanderbilt University , Nashville, TN 37235, USA
- Mallory Harris
- ORCiD
- Department of Physics and Astronomy, The University of New Mexico , Albuquerque, NM 87106, USA
- Jack J. Lissauer
- ORCiD
- NASA Ames Research Center , Moffett Field, CA 94035, USA
- Richard P. Schwarz
- ORCiD
- Center for Astrophysics , Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
- Gregor Srdoc
- Kotizarovci Observatory , Sarsoni 90, 51216 Viskovo, Croatia
- Khalid Barkaoui
- ORCiD
- Astrobiology Research Unit, Université de Liège , 19C Allée du 6 Août, B-4000 Liége, Belgium; Department of Earth, Atmospheric and Planetary Science, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA 02139, USA; Instituto de Astrofísica de Canarias (IAC) , Calle Vía Láctea s/n, E-38200 La Laguna, Tenerife, Spain
- Arno Riffeser
- University-Observatory , Ludwig-Maximilians-University, Scheinerstrasse 1, D-81679 Munich, Germany
- Kim K. McLeod
- ORCiD
- Wellesley College , Wellesley, MA, USA
- Joshua Pepper
- ORCiD
- Department of Physics, Lehigh University , 16 Memorial Drive East, Bethlehem, PA 18015, USA
- Nolan Grieves
- ORCiD
- Observatoire astronomique de ĺUniversité de Genève , 51 Chemin des Maillettes, 1290 Versoix, Switzerland
- Vera Maria Passegger
- Instituto de Astrofísica de Canarias , c/ Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna , E-38206 La Laguna, Tenerife, Spain; Hamburger Sternwarte, Universität Hamburg , Gojenbergsweg 112, D-21029 Hamburg, Germany; Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma , 440 West Brooks Street, Norman, OK 73019, USA
- Solène Ulmer-Moll
- ORCiD
- Observatoire astronomique de ĺUniversité de Genève , 51 Chemin des Maillettes, 1290 Versoix, Switzerland
- Joseph E. Rodriguez
- ORCiD
- Center for Data Intensive and Time Domain Astronomy, Department of Physics and Astronomy, Michigan State University , East Lansing, MI 48824, USA
- Dax L. Feliz
- ORCiD
- American Museum of Natural History , 200 Central Park West, Manhattan, NY 10024, USA
- Samuel Quinn
- ORCiD
- Center for Astrophysics , Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
- Andrew W. Boyle
- ORCiD
- NASA Exoplanet Science Institute-Caltech/IPAC , Pasadena, CA 91125, USA
- Michael Fausnaugh
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Michelle Kunimoto
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Pamela Rowden
- ORCiD
- Royal Astronomical Society , Burlington House, Piccadilly, London W1J 0BQ, UK
- Andrew Vanderburg
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Bill Wohler
- NASA Ames Research Center , Moffett Field, CA 94035, USA; SETI Institute , Mountain View, CA 94043, USA
- Jon M. Jenkins
- ORCiD
- NASA Ames Research Center , Moffett Field, CA 94035, USA
- David W. Latham
- ORCiD
- Harvard-Smithsonian Center for Astrophysics , 60 Garden St, Cambridge, MA 02138, USA
- George R. Ricker
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Sara Seager
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA; Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology , Cambridge, MA 02139, USA; Department of Aeronautics and Astronautics, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Joshua N. Winn
- ORCiD
- Department of Astrophysical Sciences, Princeton University , Princeton, NJ 08544, USA
- DOI
- https://doi.org/10.3847/2041-8213/aceb69
- Journal volume & issue
-
Vol. 954,
no. 1
p. L15
Abstract
We report the discovery and validation of two long-period giant exoplanets orbiting the early K dwarf TOI-4600 ( V = 12.6, T = 11.9), first detected using observations from the Transiting Exoplanet Survey Satellite (TESS) by the TESS Single Transit Planet Candidate Working Group. The inner planet, TOI-4600 b, has a radius of 6.80 ± 0.31 R _⊕ and an orbital period of 82.69 days. The outer planet, TOI-4600 c, has a radius of 9.42 ± 0.42 R _⊕ and an orbital period of 482.82 days, making it the longest-period confirmed or validated planet discovered by TESS to date. We combine TESS photometry and ground-based spectroscopy, photometry, and high-resolution imaging to validate the two planets. With equilibrium temperatures of 347 K and 191 K, respectively, TOI-4600 b and c add to the small but growing population of temperate giant exoplanets that bridge the gap between hot/warm Jupiters and the solar system’s gas giants. TOI-4600 is a promising target for further transit and precise RV observations to measure the masses and orbits of the planets as well as search for additional nontransiting planets. Additionally, with Transit Spectroscopy Metric values of ∼30, both planets are amenable for atmospheric characterization with JWST. Together, these will lend insight into the formation and evolution of planet systems with multiple giant exoplanets.
Keywords
