The Unusual M-dwarf Warm Jupiter TOI-1899 b: Refinement of Orbital and Planetary Parameters

Lin, Andrea S. J. and Libby-Roberts, Jessica E. and Alvarado-Montes, Jaime A. and Cañas, Caleb I. and Kanodia, Shubham and Han, Te and Hebb, Leslie and Jensen, Eric L. N. and Mahadevan, Suvrath and Powers, Luke C. and Swaby, Tera N. and Wisniewski, John and Beard, Corey and Bender, Chad F. and Blake, Cullen H. and Cochran, William D. and Diddams, Scott A. and Frazier, Robert C. and Fredrick, Connor and Gully-Santiago, Michael and Halverson, Samuel and Logsdon, Sarah E. and McElwain, Michael W. and Morley, Caroline and Ninan, Joe P. and Rajagopal, Jayadev and Ramsey, Lawrence W. and Robertson, Paul and Roy, Arpita and Schwab, Christian and Stefánsson, Guðmundur and Stevens, Daniel J. and Terrien, Ryan C. and Wright, Jason T. (2023) The Unusual M-dwarf Warm Jupiter TOI-1899 b: Refinement of Orbital and Planetary Parameters. The Astronomical Journal, 166 (3). p. 90. ISSN 0004-6256

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Official URL: https://doi.org/10.3847/1538-3881%2Face1ef

Abstract

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.

Item Type:	Article
Subjects:	Asian STM > Physics and Astronomy
Depositing User:	Managing Editor
Date Deposited:	11 Nov 2023 05:39
Last Modified:	11 Nov 2023 05:39
URI:	http://journal.send2sub.com/id/eprint/2693

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