The Astronomical Journal (Jan 2025)
Searching for GEMS: TOI-5688 A b, a Low-density Giant Orbiting a High-metallicity Early M-dwarf
- Varghese Reji,
- Shubham Kanodia,
- Joe P. Ninan,
- Caleb I. Cañas,
- Jessica Libby-Roberts,
- Andrea S. J. Lin,
- Arvind F. Gupta,
- Tera N. Swaby,
- Alexander Larsen,
- Henry A. Kobulnicky,
- Philip I. Choi,
- Nez Evans,
- Sage Santomenna,
- Isabelle Winnick,
- Larry Yu,
- Jaime A. Alvarado-Montes,
- Chad F. Bender,
- Lia Marta Bernabó,
- Cullen H. Blake,
- William D. Cochran,
- Scott A. Diddams,
- Samuel Halverson,
- Te Han,
- Fred Hearty,
- Sarah E. Logsdon,
- Suvrath Mahadevan,
- Michael W. McElwain,
- Andrew Monson,
- Paul Robertson,
- Devendra K. Ojha,
- Arpita Roy,
- Christian Schwab,
- Gudmundur Stefansson,
- Jason Wright
Affiliations
- Varghese Reji
- ORCiD
- Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research , Homi Bhabha Road, Colaba, Mumbai 400005, India ; [email protected]
- Shubham Kanodia
- ORCiD
- Earth and Planets Laboratory , Carnegie Science, 5241 Broad Branch Road, NW, Washington, DC 20015, USA
- Joe P. Ninan
- ORCiD
- Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research , Homi Bhabha Road, Colaba, Mumbai 400005, India ; [email protected]
- Caleb I. Cañas
- ORCiD
- NASA Goddard Space Flight Center , 8800 Greenbelt Road, Greenbelt, MD 20771, USA
- Jessica Libby-Roberts
- ORCiD
- Department of Astronomy & Astrophysics, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA; Center for Exoplanets and Habitable Worlds, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA
- Andrea S. J. Lin
- ORCiD
- Department of Astronomy & Astrophysics, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA; Center for Exoplanets and Habitable Worlds, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA
- Arvind F. Gupta
- ORCiD
- NSF NOIRLab , 950 North Cherry Avenue, Tucson, AZ 85719, USA
- Tera N. Swaby
- ORCiD
- Department of Physics & Astronomy, University of Wyoming , Laramie, WY 82070, USA
- Alexander Larsen
- ORCiD
- Department of Physics & Astronomy, University of Wyoming , Laramie, WY 82070, USA
- Henry A. Kobulnicky
- ORCiD
- Department of Physics & Astronomy, University of Wyoming , Laramie, WY 82070, USA
- Philip I. Choi
- Pomona College , 333 North College Way Claremont, CA 91711, USA
- Nez Evans
- Pomona College , 333 North College Way Claremont, CA 91711, USA
- Sage Santomenna
- ORCiD
- Pomona College , 333 North College Way Claremont, CA 91711, USA
- Isabelle Winnick
- Pomona College , 333 North College Way Claremont, CA 91711, USA
- Larry Yu
- Pomona College , 333 North College Way Claremont, CA 91711, USA
- Jaime A. Alvarado-Montes
- ORCiD
- School of Mathematical and Physical Sciences, Macquarie University , Balaclava Road, North Ryde, NSW 2109, Australia; The Macquarie University Astrophysics and Space Technologies Research Centre, Macquarie University , Balaclava Road, North Ryde, NSW 2109, Australia
- Chad F. Bender
- ORCiD
- Steward Observatory, University of Arizona , 933 North Cherry Avenue, Tucson, AZ 85721, USA
- Lia Marta Bernabó
- ORCiD
- Institute of Planetary Research , German Aerospace Center (DLR), Rutherfordstrasse 2, 12489 Berlin, Germany; McDonald Observatory and Center for Planetary Systems Habitability, The University of Texas at Austin , Austin, TX 78730, USA
- Cullen H. Blake
- ORCiD
- Department of Physics and Astronomy, University of Pennsylvania , 209 South 33rd Street, Philadelphia, PA 19104, USA
- William D. Cochran
- ORCiD
- McDonald Observatory and Center for Planetary Systems Habitability, The University of Texas at Austin , Austin, TX 78730, USA
- Scott A. Diddams
- ORCiD
- Electrical, Computer & Energy Engineering, University of Colorado , 425 UCB, Boulder, CO 80309, USA; Department of Physics, University of Colorado , 2000 Colorado Avenue, Boulder, CO 80309, USA
- Samuel Halverson
- ORCiD
- Jet Propulsion Laboratory, California Institute of Technology , 4800 Oak Grove Drive, Pasadena, CA 91109, USA
- Te Han
- ORCiD
- Department of Physics & Astronomy, The University of California , Irvine, Irvine, CA 92697, USA
- Fred Hearty
- ORCiD
- Department of Astronomy & Astrophysics, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA; Center for Exoplanets and Habitable Worlds, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA
- Sarah E. Logsdon
- ORCiD
- NSF NOIRLab , 950 North Cherry Avenue, Tucson, AZ 85719, USA
- Suvrath Mahadevan
- ORCiD
- Department of Astronomy & Astrophysics, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA; Center for Exoplanets and Habitable Worlds, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA
- Michael W. McElwain
- NASA Goddard Space Flight Center , 8800 Greenbelt Road, Greenbelt, MD 20771, USA
- Andrew Monson
- ORCiD
- Steward Observatory, University of Arizona , 933 North Cherry Avenue, Tucson, AZ 85721, USA
- Paul Robertson
- ORCiD
- Department of Physics & Astronomy, The University of California , Irvine, Irvine, CA 92697, USA
- Devendra K. Ojha
- ORCiD
- Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research , Homi Bhabha Road, Colaba, Mumbai 400005, India ; [email protected]
- Arpita Roy
- ORCiD
- Astrophysics & Space Institute , Schmidt Sciences, New York, NY 10011, USA
- Christian Schwab
- ORCiD
- School of Mathematical and Physical Sciences, Macquarie University , Balaclava Road, North Ryde, NSW 2109, Australia
- Gudmundur Stefansson
- ORCiD
- Anton Pannekoek Institute for Astronomy, University of Amsterdam , Science Park 904, 1098 XH Amsterdam, The Netherlands
- Jason Wright
- ORCiD
- Department of Astronomy & Astrophysics, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA; Center for Exoplanets and Habitable Worlds, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA; Penn State Extraterrestrial Intelligence Center, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA
- DOI
- https://doi.org/10.3847/1538-3881/ada7ea
- Journal volume & issue
-
Vol. 169,
no. 3
p. 187
Abstract
We present the discovery of a low-density planet orbiting the high-metallicity early M-dwarf TOI-5688 A b. This planet was characterized as part of the search for transiting giant planets ( R ≳ 8 R _⊕ ) through the Searching for Giant Exoplanets around M-dwarf Stars (GEMS) survey. The planet was discovered with the Transiting Exoplanet Survey Satellite, and characterized with ground-based transits from Red Buttes Observatory, the Table Mountain Observatory of Pomona College, and radial velocity (RV) measurements with the Habitable-Zone Planet Finder on the 10 m Hobby Eberly Telescope and NEID on the WIYN 3.5 m telescope. From the joint fit of transit and RV data, we measure a planetary mass and radius of 124 ± 24 M _⊕ (0.39 ± 0.07 M _J ) and 10.4 ± 0.7 R _⊕ (0.92 ± 0.06 R _J ), respectively. The spectroscopic and photometric analysis of the host star TOI-5688 A shows that it is a metal-rich ([Fe/H] = 0.47 ± 0.16 dex) M2V star, favoring the core-accretion formation pathway as the likely formation scenario for this planet. Additionally, Gaia astrometry suggests the presence of a wide-separation binary companion, TOI-5688 B, which has a projected separation of ~5″ (1110 au) and is an M4V, making TOI-5688 A b part of the growing number of GEMS in wide-separation binary systems.
Keywords
