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Journal Articles The Astronomical Journal Year : 2020

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

ARES. III. Le dévoilement des deux faces de KELT-7b avec HST/WFC3

William Pluriel
  • Function : Author
Robin Baeyens
Adam Yassin Jaziri
  • Function : Author
Tiziano Zingales
  • Function : Author
Jérémy Leconte


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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hal-02937302 , version 1 (27-11-2020)



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, 2020, 160 (3), pp.112. ⟨10.3847/1538-3881/aba000⟩. ⟨hal-02937302⟩
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