The Astronomical Journal (Jan 2023)
TOI-3785 b: A Low-density Neptune Orbiting an M2-dwarf Star
- Luke C. Powers,
- Jessica Libby-Roberts,
- Andrea S. J. Lin,
- Caleb I. Cañas,
- Shubham Kanodia,
- Suvrath Mahadevan,
- Joe P. Ninan,
- Guđmundur Stefánsson,
- Arvind F. Gupta,
- Sinclaire Jones,
- Henry A. Kobulnicky,
- Andrew Monson,
- Brock A. Parker,
- Tera N. Swaby,
- Chad F. Bender,
- William D. Cochran,
- Leslie Hebb,
- Andrew J. Metcalf,
- Paul Robertson,
- Christian Schwab,
- John Wisniewski,
- Jason T. Wright
Affiliations
- Luke C. Powers
- ORCiD
- Department of Astronomy & Astrophysics, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA ; [email protected]; Center for Exoplanets and Habitable Worlds, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA
- Jessica Libby-Roberts
- ORCiD
- Department of Astronomy & Astrophysics, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA ; [email protected]; 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 ; [email protected]; Center for Exoplanets and Habitable Worlds, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA
- Caleb I. Cañas
- ORCiD
- Department of Astronomy & Astrophysics, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA ; [email protected]; Center for Exoplanets and Habitable Worlds, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA; NASA Goddard Space Flight Center , 8800 Greenbelt Road, Greenbelt, MD 20771, USA
- Shubham Kanodia
- ORCiD
- Department of Astronomy & Astrophysics, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA ; [email protected]; Center for Exoplanets and Habitable Worlds, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA; Earth and Planets Laboratory, Carnegie Institution for Science , 5241 Broad Branch Road, NW, Washington, DC 20015, USA
- Suvrath Mahadevan
- ORCiD
- Department of Astronomy & Astrophysics, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA ; [email protected]; Center for Exoplanets and Habitable Worlds, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA; ETH Zurich , Institute for Particle Physics & Astrophysics, Switzerland
- Joe P. Ninan
- ORCiD
- Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research , Homi Bhabha Road, Colaba, Mumbai 400005, India
- Guđmundur Stefánsson
- ORCiD
- Department of Astrophysical Sciences, Princeton University , 4 Ivy Lane, Princeton, NJ 08540, USA
- Arvind F. Gupta
- ORCiD
- Department of Astronomy & Astrophysics, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA ; [email protected]; Center for Exoplanets and Habitable Worlds, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA
- Sinclaire Jones
- ORCiD
- Department of Astrophysical Sciences, Princeton University , 4 Ivy Lane, Princeton, NJ 08540, USA; Department of Astronomy, The Ohio State University , 4055 McPherson Laboratory, Columbus, OH 43210, USA
- Henry A. Kobulnicky
- ORCiD
- Department of Physics & Astronomy, University of Wyoming , Laramie, WY 82070, USA
- Andrew Monson
- ORCiD
- Steward Observatory, The University of Arizona , 933 N. Cherry Avenue, Tucson, AZ 85721, USA
- Brock A. Parker
- ORCiD
- Department of Physics & Astronomy, University of Wyoming , Laramie, WY 82070, USA
- Tera N. Swaby
- ORCiD
- Department of Physics & Astronomy, University of Wyoming , Laramie, WY 82070, USA
- Chad F. Bender
- ORCiD
- Steward Observatory, The University of Arizona , 933 N. Cherry Avenue, Tucson, AZ 85721, USA
- William D. Cochran
- ORCiD
- McDonald Observatory and Center for Planetary Systems Habitability The University of Texas , Austin, TX, USA
- Leslie Hebb
- ORCiD
- Physics Department, Hobart and William Smith Colleges , 300 Pulteney Street, Geneva, NY 14456, USA; Department of Astronomy, Cornell University , 245 East Avenue, Ithaca, NY 14850, USA
- Andrew J. Metcalf
- ORCiD
- Air Force research laboratory , Kirtland AFB, Albuquerque, NM 87117, USA
- Paul Robertson
- ORCiD
- Department of Physics & Astronomy, University of California Irvine , Irvine, CA 92697, USA
- Christian Schwab
- ORCiD
- School of Mathematical and Physical Sciences, Macquarie University , Balaclava Road, North Ryde, NSW 2109, Australia
- John Wisniewski
- ORCiD
- George Mason University Department of Physics & Astronomy, 4400 University Drive, MS 3F3, Fairfax, VA 22030, USA
- Jason T. Wright
- ORCiD
- Department of Astronomy & Astrophysics, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA ; [email protected]; 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/acd8bf
- Journal volume & issue
-
Vol. 166,
no. 2
p. 44
Abstract
Using both ground-based transit photometry and high-precision radial velocity spectroscopy, we confirm the planetary nature of TOI-3785 b. This transiting Neptune orbits an M2-Dwarf star with a period of ∼4.67 days, a planetary radius of 5.14 ± 0.16 R _⊕ , a mass of ${14.95}_{-3.92}^{+4.10}$ M _⊕ , and a density of $\rho ={0.61}_{-0.17}^{+0.18}$ g cm ^−3 . TOI-3785 b belongs to a rare population of Neptunes (4 R _⊕ < R _p < 7 R _⊕ ) orbiting cooler, smaller M-dwarf host stars, of which only ∼10 have been confirmed. By increasing the number of confirmed planets, TOI-3785 b offers an opportunity to compare similar planets across varying planetary and stellar parameter spaces. Moreover, with a high-transmission spectroscopy metric of ∼150 combined with a relatively cool equilibrium temperature of T _eq = 582 ± 16 K and an inactive host star, TOI-3785 b is one of the more promising low-density M-dwarf Neptune targets for atmospheric follow up. Future investigation into atmospheric mass-loss rates of TOI-3785 b may yield new insights into the atmospheric evolution of these low-mass gas planets around M dwarfs.
Keywords
