Résumé / Abstract Journal-club_Doctorants

Séminaire Doctoral / Seminar PhD

« Analysis of chemistry in five hot Jupiters’ atmosphere »

Emilie Panek
Institut d'Astrophysique de Paris (Paris, France)

Studying chemical composition is fundamental to modeling the formation history of planets and planetary systems. With the first JWST data and the upcoming Ariel satellite, we expect a leap forward in the exoplanet’s atmosphere field. That’s why we propose here an analysis of five targets to improve the determination of their composition and the chemical mechanisms that take place in their atmospheres, combining multiple instruments and using retrieval methods. Our five targets are HAT-P-12b, HD 209458b, WASP-6b, WASP-17b, and WASP-39b, which have temperatures ranging from 1000K to 1700K and radii ranging from 0.9 to 1.9 Jupiter radius. We use spatially scanned observations from the Wide Field Camera 3 and the Space Telescope Imaging Spectrograph on the Hubble Space Telescope, with a wavelength coverage of 0.4 to 1.7 microns. We analyze these data with the publicly available Iraclis pipeline (Tsiaras et al. (2018)). We performed a bayesian inference analysis considering molecular abundances varying freely and with equilibrium chemistry ACE (Agundez, M. et al. (2012, 2020)) and FastChem (Stock et al. (2018)). This work is detailed in a dedicated paper Panek et al. (2023). For very hot planets, thermochemical equilibrium may be close to reality, but for less hot planets, vertical mixing and photodissociation bring these planets out of equilibrium. That is why I am also presenting today new results extended to a non-equilibrium thermochemistry model (Venot et al. (2020)).
vendredi 15 mars 2024 - 16:00
Salle des séminaires Évry Schatzman, Institut d'Astrophysique
Page web du séminaire / Seminar's webpage