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

journal contribution
posted on 2023-05-21, 11:52 authored by Pluriel, W, Whiteford, N, Edwards, B, Changeat, Q, Yip, KH, Baeyens, R, Al-Refaie, A, Fabienne Bieger, M, Blain, D, Gressier, A, Guilluy, G, Yassin Jaziri, A, Kiefer, F, Modirrousta-Galian, D, Morvan, M, Mugnai, LV, Poveda, M, Skaf, N, Zingales, T, Wright, S, Charnay, B, Drossart, P, Leconte, J, Tsiaras, A, Venot, O, Waldmann, I, Jean-Philippe BeaulieuJean-Philippe Beaulieu

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 H2O 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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Astronomical Journal



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School of Natural Sciences


Univ Chicago Press

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1427 E 60Th St, Chicago, USA, Il, 60637-2954

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