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, A. F. Al-Refaie, Michelle Fabienne Bieger, Doriann Blain, Amélie Gressier, G. Guilluy, Adam Yassin Jaziri, F. Kiefer, Darius Modirrousta‐Galian, Mario Morvan, Lorenzo V. Mugnai, Mathilde Poveda, Nour Skaf, T. Zingales, Sam Wright, Benjamin Charnay, P. Drossart, Jérémy Leconte, Angelos Tsiaras, Olivia Vénot, I. Waldmann, Jean‐Philippe Beaulieu
Abstract
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.