Searching for GEMS: TOI-5916 b & TOI-6158 b are Two Saturn-density Planets Orbiting M2 Dwarfs

The Astronomical Journal 2026 Open access

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Authors: Shane O’Brien, Amber Wong, Te Han, Paul M. Robertson, Shubham Kanodia, Caleb I. Cañas, Arvind F. Gupta, Tera N. Swaby, Henry A. Kobulnicky, N. Morrell, Michael Rodruck, Andrea S. J. Lin
+11 more Andrew J. Monson, William D. Cochran, Chad F. Bender, Scott A. Diddams, Samuel Halverson, Daniel M. Krolikowski, Jessica E. Libby-Roberts, Joe Philip Ninan, Arpita Roy, Christian Schwab, Guðmundur Stefánsson
DOI: 10.3847/1538-3881/ae844e
Cited by: 0
References: 72

Abstract

Abstract We confirm the planetary nature of (1) TOI-5916 b and (2) TOI-6158 b, two giant exoplanets around M-dwarf stars (GEMS), both discovered by the Transiting Exoplanet Survey Satellite. Both systems were confirmed with ground-based photometry (Red Buttes Observatory and Swope, respectively) and radial velocity data from the Habitable-zone Planet Finder. Their radii are R 1 = 11 . 8 − 0.51 + 0.52 R ⊕ (1.05 ± 0.05 R J ) and R 2 = 10 . 4 − 1.11 + 2.70 R ⊕ ( 0.9 3 − 0.10 + 0.24 R J ), their masses are M 1 = 219 ± 28 M ⊕ ( 0.68 8 − 0.088 + 0.087 M J ) and M 2 = 13 5 − 18 + 19 M ⊕ ( 0.42 5 − 0.058 + 0.060 M J ), and their orbital periods are P 1 = 2.3671234 1 − 0.0000032

Fields of Study & Subjects

Astro and Planetary Science Space Exploration and Technology Stellar planetary and galactic studies

Publication details

Journal / source
The Astronomical Journal
Volume
172
Issue
2
Pages
117–117
Publication date
27 July 2026
Language
EN