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Rackham, Daniel Angerhausen, D\\'aniel Apai, Fei Yan, Jeroen Bouwman, Leen Decin, Ludmila Carone, Monika Lendl, Nestor Espinoza, Olivia Venot, Paul Molli\\`ere, Robin Baeyens, Thomas Henning, Yifan Zhou","submitted_at":"2020-06-09T16:30:15Z","abstract_excerpt":"We investigate the atmospheric composition of the long period ($P_{\\rm orb}=$ 10 days), eccentric exo-Saturn WASP-117b. WASP-117b could be in atmospheric temperature and chemistry similar to WASP-107b. In mass and radius WASP-117b is similar to WASP-39b, which allows a comparative study of these planets.\n  We analyze a near-infrared transmission spectrum of WASP-117b taken with Hubble Space Telescope/WFC3 G141, which was reduced with two independent pipelines. High resolution measurements were taken with VLT/ESPRESSO in the optical. 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