Meteoritic and Planetary Constraints on Our Protoplanetary Disk

Steve Desch (ASU)
Event Date and Time: 
Mon, 2015-02-02 15:30 - 16:30
Hennings 318

Planets form from protoplanetary disks, and our own solar nebula was one example. To understand how planets form, we must first constrain the surface density of gas and dust in such disks, and how the surface density evolves over time. Important factors that govern this evolution include the amount of ultraviolet radiation impinging on the disk, and the magnetic field strength in the disk.  It is very difficult to measure surface density or magnetic field strength using astronomical observations, but data from meteorites and the planets in our solar system can constrain what these quantities were in our own disk.  I will discuss the modeling I have done that shows that our solar system probably formed in a stellar cluster, had a magnetic field strength of about 0.1 G,and evolved quite differently than previous models have predicted.

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