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We present the transmission spectrum of the inflated hot-Jupiter WASP-17 b,observed with the STIS and WFC3 instruments aboard the Hubble Space Telescope,allowing for a continuous wavelength coverage from ~0.4 to ~1.7 um.Observations taken with IRAC channel 1 and 2 on the Spitzer Space Telescope arealso included, adding photometric measurements at 3.6 and 4.5 um. HST spectraldata was analysed with Iraclis, a pipeline specialised in the reduction of STISand WFC3 transit and eclipse observations. Spitzer photometric observationswere reduced with the TLCD-LSTM method, utilising recurrent neural networks.The outcome of our reduction produces incompatible results between STIS visit 1and visit 2, which leads us to consider two scenarios for G430L. Additionally,by modelling the WFC3 data alone, we can extract atmospheric informationwithout having to deal with the contrasting STIS datasets. We run separateretrievals on the three spectral scenarios with the aid of TauREx 3, a fullyBayesian retrieval framework. We find that, independently of the dataconsidered, the exoplanet atmosphere displays strong water signatures andpotentially, the presence of aluminium oxide (AlO) and titanium hydride (TiH).A retrieval that includes an extreme photospheric activity of the host star isthe preferred model, but we recognise that such a scenario is unlikely for anF6-type star. Due to the incompleteness of all STIS spectral lightcurves, onlyfurther observations with this instrument would allow us to properly constrainthe atmospheric limb of WASP-17 b, before JWST or Ariel will come online.

The transmission spectrum of WASP-17 b from the optical to the near-infrared wavelengths: combining STIS, WFC3 and IRAC datasets