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. ORCID: https://orcid.org/0000-0002-9007-9802, Poveda, Mathilde, Skaf, Nour, Zingales, Tiziano, Wright, Sam, Charnay, Benjamin, Drossart, Pierre, Leconte, Jérémy, Tsiaras, Angelos, Venot, Olivia, Waldmann, Ingo and Beaulieu, Jean-Philippe 2020. ARES. III. Unveiling the two faces of KELT-7 b with HST WFC3. Astronomical Journal 160 (3) 10.3847/1538-3881/aba000

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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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	IOP Publishing
ISSN:	1538-3881
Date of Acceptance:	23 June 2020
Last Modified:	09 Jun 2023 11:30
URI:	https://orca.cardiff.ac.uk/id/eprint/159698

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