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ARES. II. Characterizing the Hot Jupiters WASP-127 b, WASP-79 b, and WASP-62b with the Hubble Space Telescope


Skaf, N and Bieger, MF and Edwards, B and Changeat, Q and Morvan, M and Kiefer, F and Blain, D and Zingales, T and Poveda, M and Al-Refaie, A and Baeyens, R and Gressier, A and Guilluy, G and Jaziri, AY and Modirrousta-Galian, D and Mugnai, LV and Pluriel, W and Whiteford, N and Wright, S and Yip, KH and Charnay, B and Leconte, J and Drossart, P and Tsiaras, A and Venot, O and Waldmann, I and Beaulieu, J-P, ARES. II. Characterizing the Hot Jupiters WASP-127 b, WASP-79 b, and WASP-62b with the Hubble Space Telescope, Astronomical Journal, 160, (3) Article 109. ISSN 0004-6256 (2020) [Refereed Article]

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DOI: doi:10.3847/1538-3881/ab94a3


This paper presents the atmospheric characterization of three large, gaseous planets: WASP-127 b, WASP-79 b, and WASP-62 b. We analyzed spectroscopic data obtained with the G141 grism (1.088-1.68 μm) of the Wide Field Camera 3 on board the Hubble Space Telescope 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(H2O) = -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 vapor 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 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. While all the planets studied here are suitable targets for characterization with upcoming facilities such as the James Webb Space Telescope 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.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Beaulieu, J-P (Dr Jean-Philippe Beaulieu)
ID Code:152300
Year Published:2020
Web of Science® Times Cited:34
Deposited By:Plant Science
Deposited On:2022-08-16
Last Modified:2022-09-15

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