Kees Dullemond -- From dust to planetary embryos





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Published on Jun 27, 2012

Kees Dullemond, University of Heidelberg
June 14, 2012

"In this review I give an overview of developments in our understanding of how planetary embryos (1 to 1000 km size bodies) form from cosmic dust (~ 1 micron size grains). The main problem is to understand how the growth process can overcome the so-called "meter-size barrier": the size range where bodies acquire such large velocities that any collisions among them lead to fragmentation rather than growth. There have been two major developments in this field over the last decade or so. One is the increasingly realistic laboratory experiments of colliding dust aggregates, as well as advances in numerical modeling of these processes. The other is the discovery and appreciation of the fundamental role of streaming instabilities in the macroscopic clumping of dust aggregates. I will review both developments, and speculate how a combination of both may be leading us to a full picture. I will also highlight a few methods of testing such scenarios, including comparison with mm-wave observations of protoplanetary disks (in particular ALMA) and comparisons to our own solar system, such as the asteroid belt and the Kuiper belt."

The Origins of Stars and their Planetary Systems
10-15 June 2012, Origins Institute, McMaster University

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