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SUMMARY:The Formation of Binary Planetesimals - Professor Andrew Youdin - 
 University of Arizona
DTSTART:20220509T150000Z
DTEND:20220509T160000Z
UID:TALK170849@talks.cam.ac.uk
CONTACT:Dr Can Cui
DESCRIPTION:The current era of astronomical observations\, Solar System ex
 ploration and powerful supercomputers is bringing new insights to the orig
 in of planetary systems.  I will focus on the origin of planetesimals\, pr
 imordial minor planets with sizes ~10 km.  These are the least massive gra
 vitationally bound objects in the universe\, and their origin is crucial t
 o understanding our Solar System and extrasolar planets.  I will describe 
 current ideas for how particle growth crosses the daunting ``meter size ba
 rrier” where collisions tend to be destructive and solids can drift rapi
 dly into the host star.  I will describe the Steaming Instability\, a mech
 anism that can concentrate pebbles (large dust) to high densities in the d
 isk midplane\, triggering planetesimal formation by the gravitational coll
 apse of these pebbles.  I will describe how these theories relate to recen
 ts observations of protoplanetary disks by ALMA and to the study of the Ku
 iper belt by telescopes and by the New Horizons mission.
LOCATION:Online and MR14 stream
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