The role of the grain size-distribution during the protostellar collapse

Séminaire IPAG de Pierre Marchand (American Museum of Natural History), jeudi 25 février 2021, 15h, IPAG seminar room

Le séminaire aura lieu exceptionnellement à 15h // The seminar will take place exceptionally at 3pm

Magnetic fields play an important role during the protostellar collapse, through the magnetic braking and outflows. Non-ideal MHD effects decouple the field and the gas, with a major influence on these processes. The strength of the non-ideal MHD effects depend on the abundance and nature of the charged particles ; it is therefore crucial to know with precision the number and electric charge of the grains, parameters that are governed by their size. I will show how the grain size-distribution influences, through non-ideal MHD effects, the angular momentum regulation during star formation. I will also present a new method to calculate rapidly the coagulation and ionization of grains.