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We analyse the transmission and emission spectra of the ultra-hot JupiterWASP-76b, observed with the G141 grism of the Hubble Space Telescope's WideField Camera 3 (WFC3). We reduce and fit the raw data for each observationusing the open-source software Iraclis before performing a fully Bayesianretrieval using the publicly available analysis suite TauRex 3. Previousstudies of the WFC3 transmission spectra of WASP-76 b found hints of titaniumoxide (TiO) and vanadium oxide (VO) or non-grey clouds. Accounting for afainter stellar companion to WASP-76, we reanalyse this data and show thatremoving the effects of this background star changes the slope of the spectrum,resulting in these visible absorbers no longer being detected, eliminating theneed for a non-grey cloud model to adequately fit the data but maintaining thestrong water feature previously seen. However, our analysis of the emissionspectrum suggests the presence of TiO and an atmospheric thermal inversion,along with a significant amount of water. Given the brightness of the host starand the size of the atmospheric features, WASP-76 b is an excellent target forfurther characterisation with HST, or with future facilities, to betterunderstand the nature of its atmosphere, to confirm the presence of TiO and tosearch for other optical absorbers.

ARES I: WASP-76 b, A Tale of Two HST Spectra