TOI-1899 b is a rare exoplanet, a temperate Warm Jupiter orbiting an M-dwarf, first discovered by Ca\~nas 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 d, along with a radius of Rp=0.99±0.03RJ. We have also improved the constraints on planet mass, Mp=0.67±0.04MJ, 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.
@article{arxiv.2301.10837,
title = {The unusual M-dwarf Warm Jupiter TOI-1899~b: Refinement of orbital and planetary parameters},
author = {Andrea S. J. Lin and Jessica E. Libby-Roberts and Jaime A. Alvarado-Montes and Caleb I. Cañas and Shubham Kanodia and Te Han and Leslie Hebb and Eric L. N. Jensen and Suvrath Mahadevan and Luke C. Powers and Tera N. Swaby and John Wisniewski and Corey Beard and Chad F. Bender and Cullen H. Blake and William D. Cochran and Scott A. Diddams and Robert C. Frazier and Connor Fredrick and Michael Gully-Santiago and Samuel Halverson and Sarah E. Logsdon and Michael W. McElwain and Caroline Morley and Joe P. Ninan and Jayadev Rajagopal and Lawrence W. Ramsey and Paul Robertson and Arpita Roy and Christian Schwab and Guðmundur Stefánsson and Daniel J. Stevens and Ryan C. Terrien and Jason T. Wright},
journal= {arXiv preprint arXiv:2301.10837},
year = {2023}
}