Cet article passe en revue les récentes avancées en physique des atmosphères des exoplanètes, dans le cadre de la préparation de la mission Ariel de l’ESA. La modélisation des atmosphères, bâtie sur les modèles planétologiques développés dans l’étude du Système Solaire, peut aujourd’hui être extrapolée aux exoplanètes par l’utilisation de bases de données moléculaires adaptées aux températures rencontrées. L’une des difficultés des modèles repose sur la forte dégénérescence dans l’inversion des paramètres de structure et composition atmosphérique. Les méthodes bayesiennes d’inversion ont permis des avancées récentes, sur les observations à basse résolution du Hubble Space Telescope, et sont préparées pour les prochaines observations du James Webb Space Telescope. Les avancées attendues dans les prochaines années dans le domaine font de la caractérisation par spectroscopie des exoplanètes une des branches les plus actives du domaine.
The spectral characterization of exoplanetary atmospheres is a relatively new subject. Until recently, space and ground-based observatories allowed only a few planets to be observed with spectroscopic instruments. The arrival of JWST data and the development of new instruments on Earth will drastically modify the situation, giving access to deeper modelling contraints and to a better understanding on planet formation and evolution. This paper is devoted to describe the turning point experienced by the astronomy of exoplanets that will continue in particular with the launch of the ESA/Ariel mission at the end of the decade.
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Mot clés : Exoplanètes, Atmosphères, Modèles, Inversion, Téléscope spatial James Webb (JWST), Mission Ariel
Benjamin Charnay 1 ; Pierre Drossart 2
@article{CRPHYS_2023__24_S2_171_0, author = {Benjamin Charnay and Pierre Drossart}, title = {Characterization and modelling of exoplanetary atmospheres}, journal = {Comptes Rendus. Physique}, pages = {171--181}, publisher = {Acad\'emie des sciences, Paris}, volume = {24}, number = {S2}, year = {2023}, doi = {10.5802/crphys.143}, language = {en}, }
Benjamin Charnay; Pierre Drossart. Characterization and modelling of exoplanetary atmospheres. Comptes Rendus. Physique, Volume 24 (2023) no. S2, pp. 171-181. doi : 10.5802/crphys.143. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.143/
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