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We present new observations of the transmission spectrum of the hot JupiterWASP-6b both from the ground with the Very Large Telescope (VLT) FOcal Reducerand Spectrograph (FORS2) from 0.45-0.83 $\mu$m, and space with the TransitingExoplanet Survey Satellite (TESS) from 0.6-1.0 $\mu$m and the Hubble SpaceTelescope (HST) Wide Field Camera 3 from 1.12-1.65 $\mu$m. Archival data fromthe HST Space Telescope Imaging Spectrograph (STIS) and Spitzer is alsoreanalysed on a common Gaussian process framework, of which the STIS data showa good overall agreement with the overlapping FORS2 data. We also explore theeffects of stellar heterogeneity on our observations and its resultingimplications towards determining the atmospheric characteristics of WASP-6b.Independent of our assumptions for the level of stellar heterogeneity we detectNa I, K I and H$_2$O absorption features and constrain the elemental oxygenabundance to a value of [O/H] $\simeq -0.9\pm0.3$ relative to solar. Incontrast, we find that the stellar heterogeneity correction can havesignificant effects on the retrieved distributions of the [Na/H] and [K/H]abundances, primarily through its degeneracy with the sloping optical opacityof scattering haze species within the atmosphere. Our results also show thatdespite this presence of haze, WASP-6b remains a favourable object for futureatmospheric characterisation with upcoming missions such as the James WebbSpace Telescope.

Detection of Na, K and H$_2$O in the hazy atmosphere of WASP-6b