TY - JOUR
T1 - Searching for GEMS
T2 - Confirmation of TOI-5573 b, a Cool, Saturn-like Planet Orbiting an M Dwarf
AU - Fernandes, Rachel B.
AU - Kanodia, Shubham
AU - Delamer, Megan
AU - Hotnisky, Andrew
AU - Han, Te
AU - Cañas, Caleb I.
AU - Libby-Roberts, Jessica
AU - Reji, Varghese
AU - Gupta, Arvind F.
AU - Alvarado-Montes, Jaime A.
AU - Bender, Chad F.
AU - Blake, Cullen H.
AU - Cochran, William D.
AU - de Beurs, Zoë L.
AU - Diddams, Scott A.
AU - Dong, Jiayin
AU - Everett, Mark E.
AU - Ford, Eric B.
AU - Halverson, Samuel
AU - Higuera, Jesus
AU - Kobulnicky, Henry A.
AU - Krolikowski, Daniel M.
AU - Larsen, Alexander
AU - Lin, Andrea S.J.
AU - Mahadevan, Suvrath
AU - McElwain, Michael W.
AU - Monson, Andrew
AU - Ninan, Joe P.
AU - Paredes, Leonardo A.
AU - Patel, Yatrik G.
AU - Robertson, Paul
AU - Ross, Gabrielle
AU - Roy, Arpita
AU - Schwab, Christian
AU - Stefansson, Gudmundur
AU - Stevens, Daniel J.
AU - Vanderburg, Andrew M.
AU - Wright, Jason
N1 - Publisher Copyright:
© 2025. The Author(s). Published by the American Astronomical Society.
PY - 2025/7/1
Y1 - 2025/7/1
N2 - We present the confirmation of TOI-5573 b, a Saturn-sized exoplanet on an 8.79 days orbit around an early M dwarf (3790 K, 0.59 R⊙, 0.61 M⊙, 12.30 Jmag). TOI-5573 b has a mass of 11 2 − 19 + 18 M⊕(0.35 ± 0.06 MJup) and a radius of 9.75 ± 0.47 R⊕(0.87 ± 0.04 RJup), resulting in a density of 0.6 6 − 0.13 + 0.16 g cm−3, akin to that of Saturn. The planet was initially discovered by the Transiting Exoplanet Survey Satellite (TESS) and confirmed using a combination of 11 transits from four TESS Sectors (20, 21, 47, and 74), ground-based photometry from the Red Buttes Observatory, and high-precision radial velocity data from the Habitable-zone Planet Finder and NN-EXPLORE Exoplanet Investigations with Doppler spectrographs, achieving a 5σ precision on the planet’s mass. TOI-5573 b is one of the coolest Saturn-like exoplanets discovered around an M-dwarf, with an equilibrium temperature of only 528 ± 10 K, making it a valuable target for atmospheric characterization. Saturn-like exoplanets around M dwarfs likely form through core accretion, with increased disk opacity slowing gas accretion and limiting their mass. The host star’s supersolar metallicity supports core accretion, but uncertainties in M-dwarf metallicity estimates complicate definitive conclusions. Compared to other GEMS (Giant Exoplanets around M-dwarf Stars) orbiting metal-rich stars, TOI-5573 b aligns with the observed pattern that giant planets preferentially form around M-dwarfs with supersolar metallicity. Further high-resolution spectroscopic observations are needed to explore the role of stellar metallicity in shaping the formation and properties of giant exoplanets like TOI-5573 b.
AB - We present the confirmation of TOI-5573 b, a Saturn-sized exoplanet on an 8.79 days orbit around an early M dwarf (3790 K, 0.59 R⊙, 0.61 M⊙, 12.30 Jmag). TOI-5573 b has a mass of 11 2 − 19 + 18 M⊕(0.35 ± 0.06 MJup) and a radius of 9.75 ± 0.47 R⊕(0.87 ± 0.04 RJup), resulting in a density of 0.6 6 − 0.13 + 0.16 g cm−3, akin to that of Saturn. The planet was initially discovered by the Transiting Exoplanet Survey Satellite (TESS) and confirmed using a combination of 11 transits from four TESS Sectors (20, 21, 47, and 74), ground-based photometry from the Red Buttes Observatory, and high-precision radial velocity data from the Habitable-zone Planet Finder and NN-EXPLORE Exoplanet Investigations with Doppler spectrographs, achieving a 5σ precision on the planet’s mass. TOI-5573 b is one of the coolest Saturn-like exoplanets discovered around an M-dwarf, with an equilibrium temperature of only 528 ± 10 K, making it a valuable target for atmospheric characterization. Saturn-like exoplanets around M dwarfs likely form through core accretion, with increased disk opacity slowing gas accretion and limiting their mass. The host star’s supersolar metallicity supports core accretion, but uncertainties in M-dwarf metallicity estimates complicate definitive conclusions. Compared to other GEMS (Giant Exoplanets around M-dwarf Stars) orbiting metal-rich stars, TOI-5573 b aligns with the observed pattern that giant planets preferentially form around M-dwarfs with supersolar metallicity. Further high-resolution spectroscopic observations are needed to explore the role of stellar metallicity in shaping the formation and properties of giant exoplanets like TOI-5573 b.
UR - https://www.scopus.com/pages/publications/105009368963
UR - https://www.scopus.com/pages/publications/105009368963#tab=citedBy
U2 - 10.3847/1538-3881/addc51
DO - 10.3847/1538-3881/addc51
M3 - Article
AN - SCOPUS:105009368963
SN - 0004-6256
VL - 170
JO - Astronomical Journal
JF - Astronomical Journal
IS - 1
M1 - 55
ER -