Astronomy Colloquium: Wladimir Lyra

When

Nov. 30, 2018, 3:45pm to 4:45pm

Campus Location

Office/Remote Location

Room 217

Description

Wladimir Lyra, assistant professor in the Department of Physics and Astronomy at California State University, Northridge, will be the featured speaker at an upcoming UNLV Department of Physics and Astronomy colloquium. His talk is titled, "Planet Signatures in Transition Disks."

During the first million years of evolution, nascent planetary systems are embedded in dense disk-shaped clouds of gas. These circumstellar disks are home to a myriad of hydrodynamical processes, which bring about turbulence and the emergence of viscous-like behavior, enabling accretion of gas onto the protostar. Meanwhile, micron-sized dust grains embedded in the disk are growing through coagulation onto pebbles and rocks. Turbulence has a positive effect on these small solids, concentrating them into transient high pressure regions for long enough to achieve gravitational collapse through pebble accretion into km-sized bodies, forming the first planetesimals. Giant storm systems in the disk, similar to Jupiter's Great Red Spot, may exist in quiescent zones of the disk. These are even more prone to collecting solid material, producing the first terrestrial planets and cores of giant planets. In this talk, Lyra will discuss the state of the art and recent advances in the field of planet formation, as well as pressing problems such as the structure observed in high resolution sub-millimeter images of circumstellar disks, and how to interpret them.

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

Admission Information

This event is free and open to all.

Contact Information

External Sponsor

Department of Physics and Astronomy