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SUMMARY:Planet formation in the lab: liquid impacts as analogs for planeta
 ry collisions - Maylis Landeau (Cambridge)
DTSTART:20180201T113000Z
DTEND:20180201T123000Z
UID:TALK98092@talks.cam.ac.uk
CONTACT:Ed Gillen
DESCRIPTION:Planet accretion models predict that terrestrial planets form 
 by successive collisions in a disk of orbiting objects. During the late\, 
 most energetic collisions\, shock waves melt the colliding embryos\, which
  then behave as fluids. Existing simulations of these collisions reproduce
  the large-scale flow\, but cannot resolve the smallest scales. The small-
 scale processes are however crucial to predict the mixing between the coll
 iding embryos and the composition of the post-impact planet.\n\nIn contras
 t\, laboratory experiments fully resolve small-scale turbulence and mixing
 . I will present experiments on the impact of a liquid volume with a liqui
 d layer in a regime relevant to planetary accretion events. From these\, w
 e obtain scaling laws for mixing of the impactor as a function of impact v
 elocity\, impactor size and density difference. I will discuss implication
 s for chemical equilibration during planetary impacts.
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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