학술논문
HATS-18 b: An Extreme Short--Period Massive Transiting Planet Spinning Up Its Star
Document Type
Working Paper
Author
Penev, Kaloyan M.; Hartman, Joel D.; Bakos, Gaspar A.; Ciceri, Simona; Brahm, Rafael; Bayliss, Daniel; Bento, Joao; Jord'an, Andr'es; Csubry, Zoltan; Bhatti, W.; de Val-Borro, Miguel; Espinoza, Néstor; Zhou, George; Mancini, Luigi; Rabus, Markus; Suc, Vincent; Henning, Thomas; Schmidt, Brian P.; Noyes, Robert W.; L'az'ar, J.; Papp, Istvan; S'ari, P.
Source
Subject
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Abstract
We report the discovery by the HATSouth network of HATS-18 b: a 1.980 +/- 0.077 Mj, 1.337 +0.102 -0.049 Rj planet in a 0.8378 day orbit, around a solar analog star (mass 1.037 +/- 0.047 Msun, and radius 1.020 +0.057 -0.031 Rsun) with V=14.067 +/- 0.040 mag. The high planet mass, combined with its short orbital period, implies strong tidal coupling between the planetary orbit and the star. In fact, given its inferred age, HATS-18 shows evidence of significant tidal spin up, which together with WASP-19 (a very similar system) allows us to constrain the tidal quality factor for Sun-like stars to be in the range 6.5 <= lg(Q*/k_2) <= 7 even after allowing for extremely pessimistic model uncertainties. In addition, the HATS-18 system is among the best systems (and often the best system) for testing a multitude of star--planet interactions, be they gravitational, magnetic or radiative, as well as planet formation and migration theories.
Comment: Submitted. 12 pages, 9 figures, 5 tables
Comment: Submitted. 12 pages, 9 figures, 5 tables