Informazioni sull’evento

02/09/2018

Attenzione: a seguito delle disposizioni per il contenimento della diffusione del coronavirus, i seminari saranno in modalità online. Il link per il collegamento verrà reso disponibile nei giorni precedenti la data del seminario. Qui, invece, la playlist dei remote talks già messi in rete »

Joint Astrophysical Colloquium

Characterizing the formation mechanisms of protostellar disks: observations and models

Anaëlle Maury (AIM/CEA-Saclay)

Thursday 13/12/2018 @ 11:30, Sala IV piano Battiferro

Understanding the first steps in the formation of stars and protoplanetary disks is a great unsolved problem of modern astrophysics. Observationally, the key to constraining theoretical models lies in high-resolution studies of the youngest protostars. I will present our observations and modeling of the millimeter dust continuum emission in a sample of young protostars, and discuss our findings that most young protostellar disks (>75%) are only found at very small radii <60 au, which favors magnetized models for protostellar disk formation. I will also present our ALMA observations of the molecular line emission in a very young solar-type protostar suggesting a disk is currently forming in counter-rotation with respect to the protostellar core rotation, and discuss potential scenarii to understand this oddity. Finally, I will show our SMA and ALMA observations of the magnetic field topology in a sample of young protostars. I will conclude by comparing all observed properties of the youngest protostars to the typical outcome of models for protostellar formation. I will argue that our observations of small disks, counter-rotating disks and organized magnetic fields in the youngest star-forming cores question the established paradigm of disk formation as a simple consequence of angular momentum conservation during the main accretion phase: they instead highlight the need to investigate magnetized models in order to unveil the mechanisms responsible for protostellar disk properties.