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26 janvier 2018 Tout le mois

Louis le Sergeant d’Hendecourt (PIIM) — From Astrochemistry to Astrobiology : the role of extraterrestrial ices in the build-up of a prebiotic chemistry on telluric planets

Vendredi 26 janvier 11:00-12:00 - Amphi

Extraterrestrial ices are observed in many astrophysical environments linked to the formation of stars and planetary systems but also disks and various debris such as comets and asteroids. The chemical evolution of these ices following photo- and thermo-chemistry is routinely simulated in the laboratory. These simulations always end up with the building up of organic materials (semi refractory residues) that show the presence of many molecular bricks of life such as amino acids, nucleobases and sugars, including ribose, a key constituent of RNA. These organics do show also similarities with carbonaceous chondrites and thus suggest an astrophysical scenario in which the delivery of these materials on the primitive Earth may be important, if not essential to prebiotic chemistry. A general view of these processes will be discussed.

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