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We have performed ground-based transmission spectroscopy of the hot Jupiterorbiting the cool dwarf WASP-80 using the ACAM instrument on the WilliamHerschel Telescope (WHT) as part of the LRG-BEASTS programme. This is the thirdpaper of a ground-based transmission spectroscopy survey of hot Jupiters usinglow-resolution grism spectrographs. We observed two transits of the planet andhave constructed transmission spectra spanning a wavelength range of4640-8840A. Our transmission spectrum is inconsistent with a previously claimeddetection of potassium in WASP-80b's atmosphere, and is instead most consistentwith a haze. We also do not see evidence for sodium absorption at a resolutionof 100A.

LRG-BEASTS III: Ground-based transmission spectrum of the gas giant orbiting the cool dwarf WASP-80