Séminaire Exoplanètes / |
| « Study of hazes in exoplanet atmospheres via transit spectroscopy » |
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Anthony Arfaux |
| Nowadays, study of exoplanets has become a prime subject owing to their vast diversity in properties providing a fantastic lab to explore atmospheric phenomena. Among them, haze and clouds are expected to play a crucial role in understanding the atmospheric structure via their interaction with the surrounding environment and their impact on the observations. We use a 1D self-consistent model coupling haze and cloud microphysics, disequilibrium chemistry and radiative/convective transfer to simulate the atmosphere of gas giant exoplanets. We use this model to explore the haziness conditions of ten hot-Jupiter atmospheres based on HST observations. We further develop on the haze radiative feedback and on the (photo)chemistry of the haze precursors to constrain the conditions required for the formation of haze. Finally, we explore the implication of haze in cloud formation based on JWST observations of WASP-39b atmosphere. |
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mardi 6 février 2024 - 14:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |