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We present transmission spectroscopy of the warm Saturn-mass exoplanetWASP-39b made with the Very Large Telescope (VLT) FOcal Reducer andSpectrograph (FORS2) across the wavelength range 411-810nm. The transit depthis measured with a typical precision of 240 parts per million (ppm) inwavelength bins of 10nm on a V = 12.1 magnitude star. We detect the sodiumabsorption feature (3.2-sigma) and find evidence for potassium. Theground-based transmission spectrum is consistent with Hubble Space Telescope(HST) optical spectroscopy, strengthening the interpretation of WASP-39b havinga largely clear atmosphere. Our results demonstrate the great potential of therecently upgraded FORS2 spectrograph for optical transmission spectroscopy,obtaining HST-quality light curves from the ground.

VLT FORS2 comparative transmission spectroscopy: Detection of Na in the atmosphere of WASP-39b from the ground