分类： 天文学 >> 天文学 提交时间： 2023-02-19
Andrea S. J. Lin
Jessica E. Libby-Roberts
Jaime A. Alvarado-Montes
Caleb I. Cañas
Shubham Kanodia
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-Santiago
Samuel Halverson
摘要： TOI-1899~b is a rare exoplanet, a temperate Warm Jupiter orbiting an M-dwarf, first discovered by \citet{Canas2020_toi1899} 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 $R_p = 0.99\pm0.03$~\unit{R_{J}}. We have also improved the constraints on planet mass, $M_p = 0.67\pm{0.04}$~\unit{M_{J}}, and eccentricity, which is consistent with a circular orbit at 2$\sigma$ ($e = 0.044_{-0.027}^{+0.029}$). TOI-1899~b occupies a unique region of parameter space as the coolest known ($T_{eq} \approx$ 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.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Xian-Yu Wang
Malena Rice
Songhu Wang
Bonan Pu
Guðmundur Stefánsson
Suvrath Mahadevan
Brandon Radzom
Steven Giacalone
Zhen-Yu Wu
Thomas M. Esposito
Paul A. Dalba
Arin Avsar
Bradford Holden
Brian Skiff
Tom Polakis
Kevin Voeller
Sarah E. Logsdon
Jessica Klusmeyer
Heidi Schweiker
Dong-Hong Wu
摘要： We present spectroscopic measurements of the Rossiter-McLaughlin effect for WASP-148b, the only known hot Jupiter with a nearby warm-Jupiter companion, from the WIYN/NEID and Keck/HIRES instruments. This is one of the first scientific results reported from the newly commissioned NEID spectrograph, as well as the second obliquity constraint for a hot Jupiter system with a close-in companion, after WASP-47. WASP-148b is consistent with being in alignment with the sky-projected spin axis of the host star, with $\lambda=-8^{\circ}.2^{{+8^{\circ}.7}}_{-9^{\circ}.7}$. The low obliquity observed in the WASP-148 system is consistent with the orderly-alignment configuration of most compact multi-planet systems around cool stars with obliquity constraints, including our solar system, and may point to an early history for these well-organized systems in which migration and accretion occurred in isolation, with relatively little disturbance. By contrast, previous results have indicated that high-mass and hot stars appear to more commonly host a wide range of misaligned planets: not only single hot Jupiters, but also compact systems with multiple super-Earths. We suggest that, to account for the high rate of spin-orbit misalignments in both compact multi-planet and isolated-hot-Jupiter systems orbiting high-mass and hot stars, spin-orbit misalignments may be caused by distant giant planet perturbers, which are most common around these stellar types.
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