TY - JOUR
T1 - TOI-5205b
T2 - A Short-period Jovian planet transiting a mid-M dwarf
AU - Kanodia, Shubham
AU - Mahadevan, Suvrath
AU - Libby-Roberts, Jessica
AU - Stefansson, Gudmundur
AU - Cañas, Caleb I.
AU - Piette, Anjali A. A.
AU - Boss, Alan
AU - Teske, Johanna
AU - Chambers, John
AU - Zeimann, Greg
AU - Monson, Andrew
AU - Robertson, Paul
AU - Ninan, Joe P.
AU - Lin, Andrea S. J.
AU - Bender, Chad F.
AU - Cochran, William D.
AU - Diddams, Scott A.
AU - Gupta, Arvind F.
AU - Halverson, Samuel
AU - Hawley, Suzanne
AU - Kobulnicky, Henry A.
AU - Metcalf, Andrew J.
AU - Parker, Brock A.
AU - Powers, Luke
AU - Ramsey, Lawrence W.
AU - Roy, Arpita
AU - Schwab, Christian
AU - Swaby, Tera N.
AU - Terrien, Ryan C.
AU - Wisniewski, John
N1 - © 2023. The Author(s). Published by the American Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.
PY - 2023/3/1
Y1 - 2023/3/1
N2 - We present the discovery of TOI-5205b, a transiting Jovian planet orbiting a solar metallicity M4V star, which was discovered using Transiting Exoplanet Survey Satellite photometry and then confirmed using a combination of precise radial velocities, ground-based photometry, spectra, and speckle imaging. TOI-5205b has one of the highest mass ratios for M-dwarf planets, with a mass ratio of almost 0.3%, as it orbits a host star that is just 0.392 ± 0.015 M⊙. Its planetary radius is 1.03 ± 0.03 RJ, while the mass is 1.08 ± 0.06 MJ. Additionally, the large size of the planet orbiting a small star results in a transit depth of ∼7%, making it one of the deepest transits of a confirmed exoplanet orbiting a main-sequence star. The large transit depth makes TOI-5205b a compelling target to probe its atmospheric properties, as a means of tracing the potential formation pathways. While there have been radial-velocity-only discoveries of giant planets around mid-M dwarfs, this is the first transiting Jupiter with a mass measurement discovered around such a low-mass host star. The high mass of TOI-5205b stretches conventional theories of planet formation and disk scaling relations that cannot easily recreate the conditions required to form such planets.
AB - We present the discovery of TOI-5205b, a transiting Jovian planet orbiting a solar metallicity M4V star, which was discovered using Transiting Exoplanet Survey Satellite photometry and then confirmed using a combination of precise radial velocities, ground-based photometry, spectra, and speckle imaging. TOI-5205b has one of the highest mass ratios for M-dwarf planets, with a mass ratio of almost 0.3%, as it orbits a host star that is just 0.392 ± 0.015 M⊙. Its planetary radius is 1.03 ± 0.03 RJ, while the mass is 1.08 ± 0.06 MJ. Additionally, the large size of the planet orbiting a small star results in a transit depth of ∼7%, making it one of the deepest transits of a confirmed exoplanet orbiting a main-sequence star. The large transit depth makes TOI-5205b a compelling target to probe its atmospheric properties, as a means of tracing the potential formation pathways. While there have been radial-velocity-only discoveries of giant planets around mid-M dwarfs, this is the first transiting Jupiter with a mass measurement discovered around such a low-mass host star. The high mass of TOI-5205b stretches conventional theories of planet formation and disk scaling relations that cannot easily recreate the conditions required to form such planets.
UR - http://www.scopus.com/inward/record.url?scp=85148870156&partnerID=8YFLogxK
U2 - 10.3847/1538-3881/acabce
DO - 10.3847/1538-3881/acabce
M3 - Article
AN - SCOPUS:85148870156
SN - 0004-6256
VL - 165
SP - 1
EP - 20
JO - Astronomical Journal
JF - Astronomical Journal
IS - 3
M1 - 120
ER -