Séminaire IPAG

---

Interstellar heritage of cometary volatiles

jeudi 9 mars 2023 - 11h00

Maria Drozdovskaya - CSH Universität Bern
--- 
Comets are thought to be the least processed constituents of our modern-day Solar System. A significant portion of the km-sized cometary nucleus is made up of frozen-out volatiles. In my talk, I will draw comparisons between the cometary volatiles and the molecules that are found in young low-mass star-forming regions. I will compare their overall molecular inventories, including complex organic species. I will also explore the story that is hidden in the D/H ratios of molecules depending on their chemical family, the number of D atoms that they have, and the functional group bearing the D atoms. I will discuss methanol deuteration and the CH2DOH/CH3OD ratio, which may be the most sensitive tracer of the thermal history of prestellar core volatiles, as they undergo gravitational collapse into a protoplanetary disk and eventual incorporation into a cometesimal. I will bring forward the idea that comets of our Solar System reflect to a degree the chemical composition of the innate core that birthed our Sun.

---

Hôtes : Romane Le Gal

Salle Manuel Forestini, 414 rue de la piscine, 38400 Saint Martin d'Hères