The Unusual M-dwarf warm Jupiter TOI-1899 b: refinement of orbital and planetary parameters

Andrea S.J. Lin*, Jessica E. Libby-Roberts, Jaime A. Alvarado-Montes, Caleb I. Cañas, Shubham Kanodia, Te Han, Leslie Hebb, Eric L. N. Jensen, Suvrath Mahadevan, Luke C. Powers, Tera N. Swaby, John Wisniewski, Corey Beard, Chad F. Bender, Cullen H. Blake, William D. Cochran, Scott A. Diddams, Robert C. Frazier, Connor Fredrick, Michael Gully-SantiagoSamuel Halverson, Sarah E. Logsdon, Michael W. McElwain, Caroline Morley, Joe P. Ninan, Jayadev Rajagopal, Lawrence W. Ramsey, Paul Robertson, Arpita Roy, Christian Schwab, Guðmundur Stefánsson, Daniel J. Stevens, Ryan C. Terrien, Jason T. Wright

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)
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TOI-1899 b is a rare exoplanet, a temperate warm Jupiter orbiting an M dwarf, first discovered by Cañas et al. (2020) from a TESS single-transit event. Using new radial velocities (RVs) from the precision RV spectrographs HPF and NEID, along with additional TESS photometry and ground-based transit follow-up, we are able to derive a much more precise orbital period of P = 29.090312−0.000035+0.000036 days, along with a radius of Rp = 0.99 ± 0.03 RJ. We have also improved the constraints on planet mass, Mp = 0.67 ± 0.04 MJ, and eccentricity, which is consistent with a circular orbit at 2σ ( e = 0.044−0.027+0.029 ). TOI-1899 b occupies a unique region of parameter space as the coolest known (Teq ≈ 380 K) Jovian-sized transiting planet around an M dwarf; we show that it has great potential to provide clues regarding the formation and migration mechanisms of these rare gas giants through transmission spectroscopy with JWST, as well as studies of tidal evolution.

Original languageEnglish
Article number90
Pages (from-to)1-22
Number of pages22
JournalAstronomical Journal
Issue number3
Publication statusPublished - 1 Sept 2023

Bibliographical note

© 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.


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