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.
@article{arxiv.2006.14199,
title = {ARES III: Unveiling the Two Faces of KELT-7 b with HST WFC3},
author = {William Pluriel and Niall Whiteford and Billy Edwards and Quentin Changeat and Kai Hou Yip and Robin Baeyens and Ahmed Al-Refaie and Michelle Fabienne Bieger and Dorian Blain and Amelie Gressier and Gloria Guilluy and Adam Yassin Jaziri and Flavien Kiefer and Darius Modirrousta-Galian and Mario Morvan and Lorenzo V. Mugnai and Mathilde Poveda and Nour Skaf and Tiziano Zingales and Sam Wright and Benjamin Charnay and Pierre Drossart and Jeremy Leconte and Angelos Tsiaras and Olivia Venot and Ingo Waldmann and Jean-Philippe Beaulieu},
journal= {arXiv preprint arXiv:2006.14199},
year = {2020}
}
Comments
19 pages, 11 figures, accepted in AJ on June 23, 2020