High Temperature Measurement of Acetylene UV Absorption Cross Section for the Study of Hot Exoplanet Atmospheres
Résumé
The interpretation of exoplanet atmospheres' observations relies on the used of atmospheric models requiring fundamental physico-chemical data as inputs. To improve the accuracy of these models, it is therefore essential to obtain physico-chemical data in conditions relevant to the observed atmospheres. For this purpose, we have studied experimentally the thermal dependency of the ultraviolet (UV) absorption cross section of acetylene (C2H2) between 296 and 673 K. Our first results reveal that the absorption cross section of C2H2 increases with the temperature, the increase being more important at longer wavelengths (λ >∼180 nm) than at shorter ones.
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