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- W3100647010 abstract "We present spectral analysis of the transiting Saturn-mass planet WASP-117b, observed with the G141 grism of Wide Field Camera 3 (WFC3) on the Hubble Space Telescope. We reduce and fit the extracted spectrum from the raw transmission data using the open-source software Iraclis before performing a fully Bayesian retrieval using the publicly available analysis suite TauREx 3.0. We detect water vapour alongside a layer of fully opaque cloud, retrieving a terminator temperature of 833 K. In order to quantify the statistical significance of this detection, we employ the Atmospheric Detectability Index (ADI), deriving a value of 2.30, which provides positive but not strong evidence against the flatline model. Due to the eccentric orbit of WASP-117b, it is likely that chemical and mixing timescales oscillate throughout orbit due to the changing temperature, possibly allowing warmer chemistry to remain visible as the planet begins transit, despite the proximity of its point of ingress to apastron. We present simulated spectra of the planet as would be observed by the future space missions Ariel and JWST and show that, despite not being able to probe such chemistry with current HST data, these observatories should make it possible in the not too distant future." @default.
- W3100647010 created "2020-11-23" @default.
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- W3100647010 date "2020-10-29" @default.
- W3100647010 modified "2023-10-08" @default.
- W3100647010 title "WASP-117 b: An Eccentric Hot Saturn as a Future Complex Chemistry Laboratory" @default.
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- W3100647010 doi "https://doi.org/10.3847/1538-3881/abb9b0" @default.
- W3100647010 hasPublicationYear "2020" @default.
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