TOI-5375 B: A Very Low Mass Star at the Hydrogen-burning Limit Orbiting an Early M-type Star

Mika Lambert; Chad F. Bender; Shubham Kanodia; Caleb I. Cañas; Andrew Monson; Gudmundur Stefánsson; William D. Cochran; Mark E. Everett; Arvind F. Gupta; Fred Hearty; Henry A. Kobulnicky; Jessica E. Libby-Roberts; Andrea S. J. Lin; Suvrath Mahadevan; Joe P. Ninan; Brock A. Parker; Paul Robertson; Christian Schwab; Ryan C. Terrien

doi:10.3847/1538-3881/acc651

The Astronomical Journal (Jan 2023)

TOI-5375 B: A Very Low Mass Star at the Hydrogen-burning Limit Orbiting an Early M-type Star

Mika Lambert,
Chad F. Bender,
Shubham Kanodia,
Caleb I. Cañas,
Andrew Monson,
Gudmundur Stefánsson,
William D. Cochran,
Mark E. Everett,
Arvind F. Gupta,
Fred Hearty,
Henry A. Kobulnicky,
Jessica E. Libby-Roberts,
Andrea S. J. Lin,
Suvrath Mahadevan,
Joe P. Ninan,
Brock A. Parker,
Paul Robertson,
Christian Schwab,
Ryan C. Terrien

Affiliations

Mika Lambert: ORCiD; Steward Observatory and Department of Astronomy, University of Arizona , 933 N. Cherry Avenue, Tucson, AZ 85721, USA ; [email protected]
Chad F. Bender: ORCiD; Steward Observatory and Department of Astronomy, University of Arizona , 933 N. Cherry Avenue, Tucson, AZ 85721, USA ; [email protected]
Shubham Kanodia: ORCiD; Earth and Planets Laboratory, Carnegie Institution for Science , 5241 Broad Branch Road, NW, Washington, DC 20015, USA
Caleb I. Cañas: ORCiD; NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA; 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
Andrew Monson: ORCiD; Steward Observatory and Department of Astronomy, University of Arizona , 933 N. Cherry Avenue, Tucson, AZ 85721, USA ; [email protected]
Gudmundur Stefánsson: ORCiD; Department of Astrophysical Sciences, Princeton University , 4 Ivy Lane, Princeton, NJ 08540, USA
William D. Cochran: ORCiD; McDonald Observatory and Department of Astronomy, The University of Texas at Austin , Austin, TX, USA; Center for Planetary Systems Habitability, The University of Texas at Austin , Austin, TX, USA
Mark E. Everett: ORCiD; NSF's National Optical-Infrared Astronomy Research Laboratory, 950 N. Cherry Avenue, Tucson, AZ 85719, USA
Arvind F. Gupta: 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
Fred Hearty: 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
Jessica E. 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
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; ETH Zurich, Institute for Particle Physics & Astrophysics , Zurich, Switzerland
Joe P. Ninan: ORCiD; Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research , Homi Bhabha Road, Colaba, Mumbai 400005, India
Brock A. Parker: ORCiD; Department of Physics & Astronomy, University of Wyoming , Laramie, WY 82070, 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
Ryan C. Terrien: ORCiD; Carleton College , One North College Street, Northfield, MN 55057, USA

DOI: https://doi.org/10.3847/1538-3881/acc651
Journal volume & issue: Vol. 165, no. 5
p. 218

Abstract

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The Transiting Exoplanet Survey Satellite (TESS) mission detected a companion orbiting TIC 71268730, categorized it as a planet candidate, and designated the system TOI-5375. Our follow-up analysis using radial-velocity data from the Habitable-zone Planet Finder, photometric data from Red Buttes Observatory, and speckle imaging with NN-EXPLORE Exoplanet Stellar Speckle Imager determined that the companion is a very low mass star near the hydrogen-burning mass limit with a mass of 0.080 ± 0.002 M _☉ (83.81 ± 2.10 M _J ), a radius of ${0.1114}_{-0.0050}^{+0.0048}{R}_{\odot }$ (1.0841 ${}_{0.0487}^{0.0467}{R}_{J}$ ), and brightness temperature of 2600 ± 70 K. This object orbits with a period of 1.721553 ± 0.000001 days around an early M dwarf star (0.62 ± 0.016 M _☉ ). TESS photometry shows regular variations in the host star’s TESS light curve, which we interpreted as an activity-induced variation of ∼2%, and used this variability to measure the host star’s stellar rotation period of ${1.9716}_{-0.0083}^{+0.0080}$ days. The TOI-5375 system provides tight constraints on stellar models of low-mass stars at the hydrogen-burning limit and adds to the population in this important region.

Published in The Astronomical Journal

ISSN: 0004-6256 (Print); 1538-3881 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Astronomy
Website: https://iopscience.iop.org/journal/1538-3881

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