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We present the first characterisation of an exoplanet atmosphere with the ground-based NTT/EFOSC2. We obtained a transmission spectrum of the hot Jupiter WASP-94Ab in the optical (3900 - 7100 Å), revealing a sodium absorption feature and a Rayleigh slope. This detection suggests a moderately cloud-free atmosphere and also implies the likely presence of aerosols in the atmosphere of WASP-94Ab.

WASP-94Ab is reported to have a mass of 0.46 Jupiter masses and an inflated radius of 1.72 Jupiter radii, orbiting its host star in a misaligned retrograde orbit with a period of 3.95 days, at a distance of 0.055 AU. These characteristics make WASP-94Ab an optimal target for transmission spectroscopy, however no atmospheric studies have been published to date. 

These results demonstrate that the NTT/EFOSC2 is able to characterise exoplanet atmospheres, achieving the necessary precisions with errors of less than one atmospheric scale height. 

LRG-BEASTS: A Transmission Spectrum of the hot Jupiter WASP-94A b