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HATS-18 b: An Extreme Short--Period Massive Transiting Planet Spinning Up Its Star
- Publication Year :
- 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.<br />Comment: Submitted. 12 pages, 9 figures, 5 tables
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.1606.00848
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.3847/0004-6256/152/5/127