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TOI-3984 A b and TOI-5293 A b: Two Temperate Gas Giants Transiting Mid-M Dwarfs in Wide Binary Systems


Abstract We confirm the planetary nature of two gas giants discovered by TESS to transit M dwarfs with stellar companions at wide separations. TOI-3984 A ($J=11.93$) is an M4 dwarf hosting a short-period ($4.353326 \pm 0.000005$ days) gas giant ($M_p=0.14\pm0.03~\mathrm{M_{J}}$ and $R_p=0.71\pm0.02~\mathrm{R_{J}}$) with a wide separation white dwarf companion. TOI-5293 A ($J=12.47$) is an M3 dwarf hosting a short-period ($2.930289 \pm 0.000004$ days) gas giant ($M_p=0.54\pm0.07~\mathrm{M_{J}}$ and $R_p=1.06\pm0.04~\mathrm{R_{J}}$) with a wide separation M dwarf companion. We characterize both systems using a combination of ground-based and space-based photometry, speckle imaging, and high-precision radial velocities from the Habitable-zone Planet Finder and NEID spectrographs. TOI-3984 A b ($T_{eq}=563\pm15$ K and $\mathrm{TSM}=138_{-27}^{+29}$) and TOI-5293 A b ($T_{eq}=675_{-30}^{+42}$ K and $\mathrm{TSM}=92\pm14$) are two of the coolest gas giants among the population of hot Jupiter-sized gas planets orbiting M dwarfs and are favorable targets for atmospheric characterization of temperate gas giants and three-dimensional obliquity measurements to probe system architecture and migration scenarios.
Authors Caleb I. Cañas ORCID , Shubham Kanodia ORCID , Jessica E. Libby-Roberts ORCID , Andrea S. J. Lin ORCID , Maria Schutte ORCID , Luke Powers ORCID , Sinclaire Jones ORCID , Andrew Monson ORCID , Songhu Wang ORCID , Guðmundur Stefánsson ORCID , William D. Cochran ORCID , Paul Robertson ORCID , Suvrath Mahadevan ORCID , Adam F. Kowalski ORCID , John P. Wisniewski ORCID , Brock A. Parker University of WyomingORCID , Alexander Larsen University of WyomingORCID , Franklin A. L. Chapman University of Wyoming , Henry A. Kobulnicky University of WyomingORCID , Arvind F. Gupta ORCID , Mark E. Everett ORCID , Bryan E. Penprase ORCID , Greg Zeimann ORCID , Corey Beard ORCID , Chad F. Bender ORCID , Knicole D. Colón ORCID , Scott A. Diddams ORCID , Connor Fredrick ORCID , Samuel Halverson ORCID , Joe P. Ninan ORCID , Lawrence W. Ramsey ORCID , Arpita Roy ORCID , Christian Schwab ORCID
Journal Info Institute of Physics | The Astronomical Journal , vol: 166 , iss: 1 , pages: 30 - 30
Publication Date 6/27/2023
ISSN 0004-6256
TypeKeyword Image article
Open Access gold Gold Access
DOI https://doi.org/10.3847/1538-3881/acdac7
KeywordsKeyword Image Planetary Systems (Score: 0.453078)