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

William Pluriel; Niall Whiteford; Billy Edwards; Quentin Changeat; Kai Hou Yip; Robin Baeyens; Ahmed Al-Refaie; Michelle Fabienne Bieger; Dorian Blain; Amelie Gressier; Gloria Guilluy; Adam Yassin Jaziri; Flavien Kiefer; Darius Modirrousta-Galian; Mario Morvan; Lorenzo V. Mugnai; Mathilde Poveda; Nour Skaf; Tiziano Zingales; Sam Wright; Benjamin Charnay; Pierre Drossart; Jeremy Leconte; Angelos Tsiaras; Olivia Venot; Ingo Waldmann; Jean-Philippe Beaulieu

doi:10.3847/1538-3881/aba000

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arXiv · 2006.14199

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

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Abstract

We present the analysis of the hot-Jupiter KELT-7b using transmission and emission spectroscopy from the Hubble Space Telescope (HST), both taken with the Wide Field Camera 3 (WFC3). Our study uncovers a rich transmission spectrum which 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 (CIA) and H-. KELT-7 b had also been studied with other space-based instruments and we explore the effects of introducing these additional datasets. 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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William Pluriel, Niall Whiteford, Billy Edwards, Quentin Changeat, Kai Hou Yip, Robin Baeyens, Ahmed Al-Refaie, Michelle Fabienne Bieger, Dorian Blain, Amelie Gressier, Gloria Guilluy, Adam Yassin Jaziri, Flavien Kiefer, Darius Modirrousta-Galian, Mario Morvan, Lorenzo V. Mugnai, Mathilde Poveda, Nour Skaf, Tiziano Zingales, Sam Wright, Benjamin Charnay, Pierre Drossart, Jeremy Leconte, Angelos Tsiaras, Olivia Venot, Ingo Waldmann, Jean-Philippe Beaulieu. 2020-06-25. ARES III: Unveiling the Two Faces of KELT-7 b with HST WFC3. https://doi.org/10.3847/1538-3881/aba000

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