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

William Pluriel 1 Niall Whiteford 2, 3 Billy Edwards 4 Quentin Changeat 4 Kai Hou Yip 4 Robin Baeyens 5 Ahmed Al-Refaie 4 Michelle Fabienne Bieger 6 Dorian Blain 7 Amélie Gressier 7, 8, 9 Gloria Guilluy 10, 11 Adam Yassin Jaziri 1 Flavien Kiefer 8 Darius Modirrousta-Galian 12, 13 Mario Morvan 4 Lorenzo Mugnai 14 Mathilde Poveda 15, 16 Nour Skaf 4, 7 Tiziano Zingales 1 Sam Wright 4 Benjamin Charnay 7 Pierre Drossart 7 Jérémy Leconte 1 Angelos Tsiaras 4 Olivia Venot 15 Ingo Waldmann 4 Jean-Philippe Beaulieu 8, 17 
Abstract : We present the analysis of the hot-Jupiter KELT-7 b 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-7b 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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Submitted on : Friday, November 27, 2020 - 8:30:01 PM
Last modification on : Friday, August 5, 2022 - 12:00:45 PM
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William Pluriel, Niall Whiteford, Billy Edwards, Quentin Changeat, Kai Hou Yip, et al.. ARES. III. Unveiling the Two Faces of KELT-7 b with HST WFC3. The Astronomical Journal, American Astronomical Society, 2020, 160 (3), pp.112. ⟨10.3847/1538-3881/aba000⟩. ⟨hal-02937302⟩

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