Chemical evolution of Titan's tholins exposed to solar radiation in Low Earth Orbit onboard the EXPOSE facility and possible incidence on Titan's aerosols composition (Screen 5) - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Communication Dans Un Congrès Année : 2019

Chemical evolution of Titan's tholins exposed to solar radiation in Low Earth Orbit onboard the EXPOSE facility and possible incidence on Titan's aerosols composition (Screen 5)

Résumé

With the objective to characterize the aging of Titan's aerosols produced in the upper atmosphere and submitted to solar radiation during their long descent to the satellite surface, Titan's tholins were exposed to the direct solar radiation in low Earth orbit using the ESA's EXPOSE facility that was mounted outside the ISS for months. The interest of such an experiment comes from the exposure of the sample to the real solar radiation spectrum. Two varieties of tholins with different chemical properties were produced with the PAMPRE laboratory experiment, one using a (98:2) N2:CH4 gaseous mixture, and another one with a (90:10) mixture. These samples were exposed to the same solar radiation for the months the EXPOSE facility was mounted outside ISS. Their chemical properties measured before the flight and after their return to the laboratory were compared. Results clearly show that both tholins structure have been modified by the solar radiation. Thanks to control samples placed in the EXPOSE facility in blind cells, and in a facility in the laboratory, this evolution can be definitely attributed to UV radiation. We present here the corresponding results and the consequences we can deduce for the aging of the Titan's
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Dates et versions

insu-04461184 , version 1 (16-02-2024)

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Cyril Szopa, Nathalie Carrasco, Hervé Cottin, François Raulin, Didier Chaput, et al.. Chemical evolution of Titan's tholins exposed to solar radiation in Low Earth Orbit onboard the EXPOSE facility and possible incidence on Titan's aerosols composition (Screen 5). The Astrobiology Science Conference (AbSciCon) 2019, Mar 2019, Seattle, United States. pp.id. 136-129. ⟨insu-04461184⟩
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