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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 solaranalog 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 shortorbital period, implies strong tidal coupling between the planetary orbit andthe star. In fact, given its inferred age, HATS-18 shows evidence ofsignificant 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 therange 6.5 <= lg(Q*/k_2) <= 7 even after allowing for extremely pessimisticmodel uncertainties. In addition, the HATS-18 system is among the best systems(and often the best system) for testing a multitude of star--planetinteractions, be they gravitational, magnetic or radiative, as well as planetformation and migration theories.

HATS-18 b: An Extreme Short--Period Massive Transiting Planet Spinning Up Its Star