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23 April 2024 |
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HATS-18 b: An Extreme Short--Period Massive Transiting Planet Spinning Up Its Star | | Dr. Kaloyan M. Penev
; Dr. Joel D. Hartman
; Dr. Gaspar A. Bakos
; Ms. Simona Ciceri
; Dr. Rafael Brahm
; Dr. Daniel Bayliss
; Joao Bento
; Andr'es Jord'an
; Mr. Zoltan Csubry
; W. Bhatti
; Miguel de Val-Borro
; Mr. Néstor Espinoza
; Dr. George Zhou
; Dr. Luigi Mancini
; Dr. Markus Rabus
; Vincent Suc
; Thomas Henning
; Prof. Brian P. Schmidt
; Dr. Robert W. Noyes
; J. L'az'ar
; Istvan Papp
; P. S'ari
; | | Date: |
2 Jun 2016 | | 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. | | Source: | arXiv, 1606.0848 | | Services: | Forum | Review | PDF | Favorites | |
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