Searching for GEMS: TOI-5916 b & TOI-6158 b are two Saturn-density planets orbiting M2 dwarfs
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2025
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| author | O'Brien, Shane Wong, Amber Han, Te Robertson, Paul Kanodia, Shubham Cañas, Caleb I. Gupta, Arvind F. Swaby, Tera Kobulnicky, Henry A. Morrell, Nidia Rodruck, Michael Lin, Andrea S. J. Monson, Andrew Cochran, William D. Bender, Chad F. Diddams, Scott A. Halverson, Samuel Krolikowski, Daniel M. Libby-Roberts, Jessica E. Ninan, Joe P. Roy, Arpita Schwab, Christian Stefansson, Gudmundur |
| author_facet | O'Brien, Shane Wong, Amber Han, Te Robertson, Paul Kanodia, Shubham Cañas, Caleb I. Gupta, Arvind F. Swaby, Tera Kobulnicky, Henry A. Morrell, Nidia Rodruck, Michael Lin, Andrea S. J. Monson, Andrew Cochran, William D. Bender, Chad F. Diddams, Scott A. Halverson, Samuel Krolikowski, Daniel M. Libby-Roberts, Jessica E. Ninan, Joe P. Roy, Arpita Schwab, Christian Stefansson, Gudmundur |
| contents | We confirm the planetary nature of (1) TOI-5916 b and (2) TOI-6158 b, two Exoplanets Transiting M-dwarf Stars (GEMS), both discovered by the Transiting Exoplanet Survey Satellite (TESS). 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 $R_{1}=11.8^{+0.52}_{-0.51}\text{ }R_{\oplus}$ and $R_{2}=10.4^{+2.70}_{-1.11}\text{ }R_{\oplus}$ and masses are $M_{1}=219\pm28\text{ }M_{\oplus}$ and $M_{2}=135^{+19}_{-18}\text{ }M_{\oplus}$. Both planets have Saturn-like densities ($ρ_{1} = 0.73^{+0.14}_{-0.13}\,\text{g cm}^{-3}$, $ρ_{2} = 0.66^{+0.41}_{-0.23}\,\text{g cm}^{-3}$), which appears to be a growing trend among GEMS systems and, more generally, warm Jupiters. In confirming both of these exoplanets, we add to the growing evidence for a population of Saturn-density planets among the GEMS systems. We also find evidence for a preliminary trend in which GEMS exhibit systematically closer orbits compared to FGK giants. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_11798 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Searching for GEMS: TOI-5916 b & TOI-6158 b are two Saturn-density planets orbiting M2 dwarfs O'Brien, Shane Wong, Amber Han, Te Robertson, Paul Kanodia, Shubham Cañas, Caleb I. Gupta, Arvind F. Swaby, Tera Kobulnicky, Henry A. Morrell, Nidia Rodruck, Michael Lin, Andrea S. J. Monson, Andrew Cochran, William D. Bender, Chad F. Diddams, Scott A. Halverson, Samuel Krolikowski, Daniel M. Libby-Roberts, Jessica E. Ninan, Joe P. Roy, Arpita Schwab, Christian Stefansson, Gudmundur Earth and Planetary Astrophysics We confirm the planetary nature of (1) TOI-5916 b and (2) TOI-6158 b, two Exoplanets Transiting M-dwarf Stars (GEMS), both discovered by the Transiting Exoplanet Survey Satellite (TESS). 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 $R_{1}=11.8^{+0.52}_{-0.51}\text{ }R_{\oplus}$ and $R_{2}=10.4^{+2.70}_{-1.11}\text{ }R_{\oplus}$ and masses are $M_{1}=219\pm28\text{ }M_{\oplus}$ and $M_{2}=135^{+19}_{-18}\text{ }M_{\oplus}$. Both planets have Saturn-like densities ($ρ_{1} = 0.73^{+0.14}_{-0.13}\,\text{g cm}^{-3}$, $ρ_{2} = 0.66^{+0.41}_{-0.23}\,\text{g cm}^{-3}$), which appears to be a growing trend among GEMS systems and, more generally, warm Jupiters. In confirming both of these exoplanets, we add to the growing evidence for a population of Saturn-density planets among the GEMS systems. We also find evidence for a preliminary trend in which GEMS exhibit systematically closer orbits compared to FGK giants. |
| title | Searching for GEMS: TOI-5916 b & TOI-6158 b are two Saturn-density planets orbiting M2 dwarfs |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2510.11798 |