Searching for GEMS: TOI-7149~b an Inflated Giant Planet causing a 12% Transit of a Fully Convective M-dwarf
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Kanodia, Shubham Cañas, Caleb I. Mahadevan, Suvrath Lin, Andrea S. J. Kobulnicky, Henry A. Karfs, Ian Birkholz, Alexina Gupta, Arvind Everett, Mark Rodruck, Michael Glusman, Rowen I. Han, Te Cochran, William D. Bender, Chad F. Diddams, Scott A. Krolikowski, Daniel Halverson, Samuel Libby-Roberts, Jessica Ninan, Joe P. Robertson, Paul Roy, Arpita Schwab, Christian Stefánsson, Guðmundur |
| author_facet | Kanodia, Shubham Cañas, Caleb I. Mahadevan, Suvrath Lin, Andrea S. J. Kobulnicky, Henry A. Karfs, Ian Birkholz, Alexina Gupta, Arvind Everett, Mark Rodruck, Michael Glusman, Rowen I. Han, Te Cochran, William D. Bender, Chad F. Diddams, Scott A. Krolikowski, Daniel Halverson, Samuel Libby-Roberts, Jessica Ninan, Joe P. Robertson, Paul Roy, Arpita Schwab, Christian Stefánsson, Guðmundur |
| contents | We describe the discovery and characterization of TOI-7149~b, a 0.705 $\pm$ 0.075 $M_J$, 1.18 $\pm$ 0.045 $R_J$ gas giant on a $\sim 2.65$ day period orbit transiting an M4V star with a mass of 0.344 $\pm$ 0.030~\solmass{} and an effective temperature of 3363 $\pm$ 59 K. The planet was first discovered using NASA's TESS mission, which we confirmed using a combination of ground-based photometry, radial velocities, and speckle imaging. The planet has one of the deepest transits of all known main-sequence planet hosts at $\sim$ 12\% ($R_p/R_\star\sim 0.33$). Pushing the bounds of previous discoveries of \underline{G}iant \underline{E}xoplanets around \underline{M}-dwarf \underline{S}tars (GEMS), TOI-7149 is one of the lowest mass M-dwarfs to host a transiting giant planet. We compare the sample of transiting GEMS to stars within 200 pc with a Gaia colour magnitude diagram (CMD) and find that the GEMS hosts are likely to be high metallicity stars. We also analyze the sample of transiting giant planets using the non-parametric \texttt{MRExo} framework to compare the bulk density of warm Jupiters across stellar masses. We confirm our previous result that transiting Jupiters around early M-dwarfs have similar masses and densities to warm Jupiters around FGK stars, and extend this to mid M-dwarfs, thereby suggesting a potential commonality in their formation mechanisms. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_17861 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Searching for GEMS: TOI-7149~b an Inflated Giant Planet causing a 12% Transit of a Fully Convective M-dwarf Kanodia, Shubham Cañas, Caleb I. Mahadevan, Suvrath Lin, Andrea S. J. Kobulnicky, Henry A. Karfs, Ian Birkholz, Alexina Gupta, Arvind Everett, Mark Rodruck, Michael Glusman, Rowen I. Han, Te Cochran, William D. Bender, Chad F. Diddams, Scott A. Krolikowski, Daniel Halverson, Samuel Libby-Roberts, Jessica Ninan, Joe P. Robertson, Paul Roy, Arpita Schwab, Christian Stefánsson, Guðmundur Earth and Planetary Astrophysics We describe the discovery and characterization of TOI-7149~b, a 0.705 $\pm$ 0.075 $M_J$, 1.18 $\pm$ 0.045 $R_J$ gas giant on a $\sim 2.65$ day period orbit transiting an M4V star with a mass of 0.344 $\pm$ 0.030~\solmass{} and an effective temperature of 3363 $\pm$ 59 K. The planet was first discovered using NASA's TESS mission, which we confirmed using a combination of ground-based photometry, radial velocities, and speckle imaging. The planet has one of the deepest transits of all known main-sequence planet hosts at $\sim$ 12\% ($R_p/R_\star\sim 0.33$). Pushing the bounds of previous discoveries of \underline{G}iant \underline{E}xoplanets around \underline{M}-dwarf \underline{S}tars (GEMS), TOI-7149 is one of the lowest mass M-dwarfs to host a transiting giant planet. We compare the sample of transiting GEMS to stars within 200 pc with a Gaia colour magnitude diagram (CMD) and find that the GEMS hosts are likely to be high metallicity stars. We also analyze the sample of transiting giant planets using the non-parametric \texttt{MRExo} framework to compare the bulk density of warm Jupiters across stellar masses. We confirm our previous result that transiting Jupiters around early M-dwarfs have similar masses and densities to warm Jupiters around FGK stars, and extend this to mid M-dwarfs, thereby suggesting a potential commonality in their formation mechanisms. |
| title | Searching for GEMS: TOI-7149~b an Inflated Giant Planet causing a 12% Transit of a Fully Convective M-dwarf |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2506.17861 |