ARES II: Characterising the Hot Jupiters WASP-127 b, WASP-79 b and WASP-62 b with HST

17 Sep 2020  ·  Skaf Nour, Bieger Michelle Fabienne, Edwards Billy, Changeat Quentin, Morvan Mario, Kiefer Flavien, Blain Doriann, Zingales Tiziano, Poveda Mathilde, Al-Refaie Ahmed, Baeyens Robin, Gressier Amelie, Guilluy Gloria, Jaziri Adam Yassin, Modirrousta-Galian Darius, Mugnai Lorenzo V., Pluriel William, Whiteford Niall, Wright Sam, Yip Kai Hou, Charnay Benjamin, Leconte Jeremy, Drossart Pierre, Tsiaras Angelos, Venot Olivia, Waldmann Ingo, Beaulieu Jean-Philippe ·

This paper presents the atmospheric characterisation of three large, gaseous planets: WASP-127b, WASP-79b and WASP-62b. We analysed spectroscopic data obtained with the G141 grism (1.088 - 1.68 $\mu$m) of the Wide Field Camera 3 (WFC3) onboard the Hubble Space Telescope (HST) using the Iraclis pipeline and the TauREx3 retrieval code, both of which are publicly available... For WASP-127 b, which is the least dense planet discovered so far and is located in the short-period Neptune desert, our retrieval results found strong water absorption corresponding to an abundance of log(H$_2$O) = -2.71$^{+0.78}_{-1.05}$, and absorption compatible with an iron hydride abundance of log(FeH)=$-5.25^{+0.88}_{-1.10}$, with an extended cloudy atmosphere. We also detected water vapour in the atmospheres of WASP-79 b and WASP-62 b, with best-fit models indicating the presence of iron hydride, too. We used the Atmospheric Detectability Index (ADI) as well as Bayesian log evidence to quantify the strength of the detection and compared our results to the hot Jupiter population study by Tsiaras et al. 2018. While all the planets studied here are suitable targets for characterisation with upcoming facilities such as the James Webb Space Telescope (JWST) and Ariel, WASP-127 b is of particular interest due to its low density, and a thorough atmospheric study would develop our understanding of planet formation and migration. read more

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Earth and Planetary Astrophysics