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We present the analysis of the hot-Jupiter KELT-7b using transmission andemission spectroscopy from the Hubble Space Telescope (HST), both taken withthe Wide Field Camera 3 (WFC3). Our study uncovers a rich transmission spectrumwhich is consistent with a cloud-free atmosphere and suggests the presence ofH2O and H-. In contrast, the extracted emission spectrum does not containstrong absorption features and, although it is not consistent with a simpleblackbody, it can be explained by a varying temperature-pressure profile,collision induced absorption (CIA) and H-. KELT-7 b had also been studied withother space-based instruments and we explore the effects of introducing theseadditional datasets. Further observations with Hubble, or the next generationof space-based telescopes, are needed to allow for the optical opacity sourcein transmission to be confirmed and for molecular features to be disentangledin emission.

ARES III: Unveiling the Two Faces of KELT-7 b with HST WFC3