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Massive companions in close orbits around G dwarfs are thought to undergorapid orbital decay due to runaway tidal dissipation. We report here thediscovery of WASP-128b, a brown dwarf discovered by the WASP survey transitinga G0V host on a $2.2\,\mathrm{d}$ orbit, where the measured stellar rotationrate places the companion in a regime where tidal interaction is dominated bydynamical tides. Under the assumption of dynamical equilibrium, we derive avalue of the stellar tidal quality factor $\log{Q_\star'} = 6.96 \pm 0.19$. Acombined analysis of ground-based photometry and high-resolution spectroscopyreveals a mass and radius of the host, $M_\star = 1.16 \pm 0.04\,M_\odot$,$R_\star = 1.16 \pm 0.02\,R_\odot$, and for the companion, $M_\mathrm{b} =37.5\pm 0.8\,M_\mathrm{Jup}$, $R_\mathrm{b} = 0.94 \pm 0.02\,R_\mathrm{Jup}$,placing WASP-128b in the driest parts of the brown dwarf desert, and suggestinga mild inflation for its age. We estimate a remaining lifetime for WASP-128bsimilar to that of some ultra-short period massive hot Jupiters, and note itmay be a propitious candidate for measuring orbital decay and testing tidaltheories.

WASP-128b: a transiting brown dwarf in the dynamical-tide regime