Pluriel, W; Whiteford, N; Edwards, B; Changeat, Q; Yip, KH; Baeyens, R; Al-Refaie, A; ... Beaulieu, J-P; + view all Pluriel, W; Whiteford, N; Edwards, B; Changeat, Q; Yip, KH; Baeyens, R; Al-Refaie, A; Bieger, MF; Blain, D; Gressier, A; Guilluy, G; Jaziri, AY; Kiefer, F; Modirrousta-Galian, D; Morvan, M; Mugnai, L; Poveda, M; Skaf, N; Zingales, T; Wright, S; Charnay, B; Drossart, P; Leconte, J; Tsiaras, A; Venot, O; Waldmann, I; Beaulieu, J-P; - view fewer (2020) ARES. III. Unveiling the Two Faces of KELT-7 b with HST WFC3*. The Astronomical Journal , 160 (3) , Article 112. 10.3847/1538-3881/aba000.

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Abstract

We present the analysis of the hot-Jupiter KELT-7 b using transmission and emission spectroscopy from the Hubble Space Telescope, both taken with the Wide Field Camera 3. Our study uncovers a rich transmission spectrum that is consistent with a cloud-free atmosphere and suggests the presence of H_{2}O and H^{−}. In contrast, the extracted emission spectrum does not contain strong absorption features and, although it is not consistent with a simple blackbody, it can be explained by a varying temperature–pressure profile, collision induced absorption, and H^{-}. KELT-7 b had also been studied with other space-based instruments and we explore the effects of introducing these additional data sets. Further observations with Hubble, or the next generation of space-based telescopes, are needed to allow for the optical opacity source in transmission to be confirmed and for molecular features to be disentangled in emission.

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