I am studying the structure and evolution of protoplanetary disks, particularly related to the accretion of gas onto the central star. The magnetorotational instability (MRI) generates turbulence that transports angular momentum outwards. However, protoplanetary disks contain large regions of low ionization, in which three effects dominate: Ohmic diffusion, ambipolar diffusion, and the Hall effect. Exactly how these effects influence the efficiency of MRI-driven accretion in these disks is a primary focus of my work.
Observing disk turbulence with ALMA
ALMA observations of disk structure
Magnetohydrodynamic turbulence in protoplanetary disks
Athena code development
Mesoscale structures in MRI-driven turbulence
Outbursts in disks around young stars