TY - JOUR
T1 - Searching for GEMS
T2 - TOI-7149 b, an Inflated Giant Planet Causing a 12% Transit of a Fully Convective M-dwarf
AU - Kanodia, Shubham
AU - Cañas, Caleb I.
AU - Mahadevan, Suvrath
AU - Lin, Andrea S.J.
AU - Kobulnicky, Henry A.
AU - Karfs, Ian
AU - Birkholz, Alexina
AU - Monson, Andrew
AU - Gupta, Arvind F.
AU - Everett, Mark
AU - Rodruck, Michael
AU - Glusman, Rowen I.
AU - Han, Te
AU - Cochran, William D.
AU - Bender, Chad F.
AU - Diddams, Scott A.
AU - Krolikowski, Daniel
AU - Halverson, Samuel
AU - Libby-Roberts, Jessica
AU - Ninan, Joe P.
AU - Robertson, Paul
AU - Roy, Arpita
AU - Schwab, Christian
AU - Stefánsson, Gud̃mundur
N1 - Publisher Copyright:
© 2025. The Author(s). Published by the American Astronomical Society.
PY - 2025/10/1
Y1 - 2025/10/1
N2 - We describe the discovery and characterization of TOI-7149 b, a 0.705 ± 0.075 MJ, 1.18 ± 0.045 RJ gas giant on a ∼2.65 days period orbit transiting an M4V star with a mass of 0.344 ± 0.030 M⊙ and an effective temperature of 3363 ± 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 ∼12% (Rp/R⋆ ∼ 0.33). Pushing the bounds of previous discoveries of giant exoplanets around M-dwarf stars (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 color-magnitude diagram and find that the GEMS hosts are likely to be high metallicity stars. We also analyze the sample of transiting giant planets using the nonparametric 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.
AB - We describe the discovery and characterization of TOI-7149 b, a 0.705 ± 0.075 MJ, 1.18 ± 0.045 RJ gas giant on a ∼2.65 days period orbit transiting an M4V star with a mass of 0.344 ± 0.030 M⊙ and an effective temperature of 3363 ± 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 ∼12% (Rp/R⋆ ∼ 0.33). Pushing the bounds of previous discoveries of giant exoplanets around M-dwarf stars (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 color-magnitude diagram and find that the GEMS hosts are likely to be high metallicity stars. We also analyze the sample of transiting giant planets using the nonparametric 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.
UR - https://www.scopus.com/pages/publications/105015059147
UR - https://www.scopus.com/pages/publications/105015059147#tab=citedBy
U2 - 10.3847/1538-3881/adf6db
DO - 10.3847/1538-3881/adf6db
M3 - Article
AN - SCOPUS:105015059147
SN - 0004-6256
VL - 170
JO - Astronomical Journal
JF - Astronomical Journal
IS - 4
M1 - 203
ER -