A Warm Jupiter Transiting an M Dwarf: A TESS Single-transit Event Confirmed with the Habitable-zone Planet Finder
Caleb I. Cañas, Guðmundur Stefánsson, Shubham Kanodia, Suvrath Mahadevan, William D. Cochran, Michael Endl, Paul Robertson, Chad F. Bender, Joe P. Ninan, Corey Beard, Jack Lubin, Arvind F. Gupta, Mark E. Everett, Andrew Monson, Robert F. Wilson, Hannah M. Lewis, M. Brewer, Steven R. Majewski, Leslie Hebb, Rebekah I. Dawson, Scott A. Diddams, Eric B. Ford, Connor Fredrick, Samuel Halverson, Fred Hearty, Andrea S. J. Lin, Andrew J. Metcalf, Jayadev Rajagopal, Lawrence W. Ramsey, Arpita Roy, Christian Schwab, Ryan C. Terrien, Jason T. Wright
Abstract
Abstract We confirm the planetary nature of a warm Jupiter transiting the early M dwarf TOI-1899 using a combination of available TESS photometry; high-precision, near-infrared spectroscopy with the Habitable-zone Planet Finder; and speckle and adaptive optics imaging. The data reveal a transiting companion on an ∼29 day orbit with a mass and radius of and , respectively. The star, TOI-1899, is the lowest-mass star known to host a transiting warm Jupiter, and we discuss the follow-up opportunities afforded by a warm ( K) gas giant orbiting an M0 star. Our observations reveal that TOI-1899.01 is a puffy warm Jupiter, and we suggest additional transit observations to both refine the orbit and constrain the true dilution observed in TESS.