A Warm Jupiter transiting an M dwarf

A TESS single-transit event confirmed with the Habitable-zone Planet Finder

Caleb I. Cañas*, Gudmundur Stefansson, 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, Mary Brewer, Steven R. Majewski, Leslie Hebb, Rebekah I. Dawson & 13 others 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

*Corresponding author for this work

Research output: Contribution to journalArticle


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 0.66 ± 0.07 MJ and 1.15-0.05+0.04 RJ, 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 (Teq ∼ 362 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.

Original languageEnglish
Article number147
Pages (from-to)1-14
Number of pages14
JournalAstronomical Journal
Issue number3
Publication statusPublished - 1 Sep 2020

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