TY - JOUR
T1 - Searching for GEMS
T2 - TOI-5688 A b, a Low-density Giant Orbiting a High-metallicity Early M-dwarf
AU - Reji, Varghese
AU - Kanodia, Shubham
AU - Ninan, Joe P.
AU - Cañas, Caleb I.
AU - Libby-Roberts, Jessica
AU - Lin, Andrea S.J.
AU - Gupta, Arvind F.
AU - Swaby, Tera N.
AU - Larsen, Alexander
AU - Kobulnicky, Henry A.
AU - Choi, Philip I.
AU - Evans, Nez
AU - Santomenna, Sage
AU - Winnick, Isabelle
AU - Yu, Larry
AU - Alvarado-Montes, Jaime A.
AU - Bender, Chad F.
AU - Bernabó, Lia Marta
AU - Blake, Cullen H.
AU - Cochran, William D.
AU - Diddams, Scott A.
AU - Halverson, Samuel
AU - Han, Te
AU - Hearty, Fred
AU - Logsdon, Sarah E.
AU - Mahadevan, Suvrath
AU - McElwain, Michael W.
AU - Monson, Andrew
AU - Robertson, Paul
AU - Ojha, Devendra K.
AU - Roy, Arpita
AU - Schwab, Christian
AU - Stefansson, Gudmundur
AU - Wright, Jason
N1 - Publisher Copyright:
© 2025. The Author(s). Published by the American Astronomical Society.
PY - 2025/3/3
Y1 - 2025/3/3
N2 - We present the discovery of a low-density planet orbiting the high-metallicity early M-dwarf TOI-5688 A b. This planet was characterized as part of the search for transiting giant planets (R ≳ 8 R⊕) through the Searching for Giant Exoplanets around M-dwarf Stars (GEMS) survey. The planet was discovered with the Transiting Exoplanet Survey Satellite, and characterized with ground-based transits from Red Buttes Observatory, the Table Mountain Observatory of Pomona College, and radial velocity (RV) measurements with the Habitable-Zone Planet Finder on the 10 m Hobby Eberly Telescope and NEID on the WIYN 3.5 m telescope. From the joint fit of transit and RV data, we measure a planetary mass and radius of 124 ± 24 M⊕ (0.39 ± 0.07 MJ) and 10.4 ± 0.7 R⊕ (0.92 ± 0.06 RJ), respectively. The spectroscopic and photometric analysis of the host star TOI-5688 A shows that it is a metal-rich ([Fe/H] = 0.47 ± 0.16 dex) M2V star, favoring the core-accretion formation pathway as the likely formation scenario for this planet. Additionally, Gaia astrometry suggests the presence of a wide-separation binary companion, TOI-5688 B, which has a projected separation of ~5″ (1110 au) and is an M4V, making TOI-5688 A b part of the growing number of GEMS in wide-separation binary systems.
AB - We present the discovery of a low-density planet orbiting the high-metallicity early M-dwarf TOI-5688 A b. This planet was characterized as part of the search for transiting giant planets (R ≳ 8 R⊕) through the Searching for Giant Exoplanets around M-dwarf Stars (GEMS) survey. The planet was discovered with the Transiting Exoplanet Survey Satellite, and characterized with ground-based transits from Red Buttes Observatory, the Table Mountain Observatory of Pomona College, and radial velocity (RV) measurements with the Habitable-Zone Planet Finder on the 10 m Hobby Eberly Telescope and NEID on the WIYN 3.5 m telescope. From the joint fit of transit and RV data, we measure a planetary mass and radius of 124 ± 24 M⊕ (0.39 ± 0.07 MJ) and 10.4 ± 0.7 R⊕ (0.92 ± 0.06 RJ), respectively. The spectroscopic and photometric analysis of the host star TOI-5688 A shows that it is a metal-rich ([Fe/H] = 0.47 ± 0.16 dex) M2V star, favoring the core-accretion formation pathway as the likely formation scenario for this planet. Additionally, Gaia astrometry suggests the presence of a wide-separation binary companion, TOI-5688 B, which has a projected separation of ~5″ (1110 au) and is an M4V, making TOI-5688 A b part of the growing number of GEMS in wide-separation binary systems.
UR - https://www.scopus.com/pages/publications/85219569072
UR - https://www.scopus.com/pages/publications/85219569072#tab=citedBy
U2 - 10.3847/1538-3881/ada7ea
DO - 10.3847/1538-3881/ada7ea
M3 - Article
AN - SCOPUS:85219569072
SN - 0004-6256
VL - 169
JO - Astronomical Journal
JF - Astronomical Journal
IS - 3
M1 - 187
ER -