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.
ARES. III. Unveiling the Two Faces of KELT-7 b with HST WFC3 / Pluriel, William; Whiteford, Niall; Edwards, Billy; Changeat, Quentin; Yip, Kai Hou; Baeyens, Robin; Al-Refaie, Ahmed; Fabienne Bieger, Michelle; Blain, Dorian; Gressier, Amélie; Guilluy, Gloria; Yassin Jaziri, Adam; Kiefer, Flavien; Modirrousta-Galian, Darius; Morvan, Mario; Mugnai, Lorenzo V.; Poveda, Mathilde; Skaf, Nour; Zingales, Tiziano; Wright, Sam; Charnay, Benjamin; Drossart, Pierre; Leconte, Jérémy; Tsiaras, Angelos; Venot, Olivia; Waldmann, Ingo; Beaulieu, Jean-Philippe. - In: THE ASTRONOMICAL JOURNAL. - ISSN 0004-6256. - 160:3(2020), p. 112. [10.3847/1538-3881/aba000]
ARES. III. Unveiling the Two Faces of KELT-7 b with HST WFC3
Mugnai, Lorenzo V.;
2020
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 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.| File | Dimensione | Formato | |
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