Astronomy Colloquium: Kengo Tomida

When

Apr. 5, 2019, 3:45pm to 4:45pm

Campus Location

Office/Remote Location

Room 217

Description

Dr. Kengo Tomida from Osaka University will be the featured speaker at an upcoming Department of Physics and Astronomy colloquium. His talk is titled, "Formation and Early Evolution of Circumstellar Disks."

Angular momentum transport by magnetic fields is the key physical process in star and disk formation processes. Non-ideal magnetohydrodynamic effects such as Ohmic dissipation and ambipolar diffusion extract magnetic flux and suppress angular momentum transport. Using MHD simulations we found that these effects can resolve the so-called magnetic braking catastrophe in the early phase of star formation. Tomida investigates the long-term evolution of the disk using a sink particle technique. As the accretion continues, the disk acquires larger angular momentum and grows in the size and mass. He compares their simulations with recent ALMA observations by synthetic observations, and found that our models are in good agreement with some objects.

There will be refreshments starting at 3:30 p.m.

Admission Information

Admisison is free and open to all.

Contact Information

External Sponsor

Department of Physics and Astronomy