Two Easy Pieces, On a Theme Of Disks: Saturn's Rings, and Planetesimal Formation

Details Two Easy Pieces, On a Theme Of Disks: Saturn's Rings, and Planetesimal Formation Two Easy Pieces, On a Theme Of Disks: Saturn's Rings, and Planetesimal Formation

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.3501c&link_type=abstract

American Astronomical Society, DPS meeting #42, #35.01; Bulletin of the American Astronomical Society, Vol. 42, p.1016

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Subject to change, it's my intent for this talk to highlight progress and outstanding problems in two fascinating, topically different, methodologically related research areas (reality may limit me to only one). New understanding of Saturn's rings has flowered under their close scrutiny by Cassini; the rings have come alive before our eyes. I'll review highlights of what we have learned about the rings to date, and note the big open questions in need of more attention. Many ring scientists go on to study the physics of accretion in protoplanetary particle disks, where much ring physics is readily applicable; however, in the early stages of protoplanetary accretion, nebula gas plays a key role, unlike in the rings case. A number of new theoretical and observational insights have emerged in the last decade, spurred partly by new observations and theoretical models of accretion disks and exoplanets. Some of these models have significant and novel implications for meteoritics - which is often disconnected from astrophysics, but which provides powerful and unique ground truth about the nature of our own protoplanetary system. Recent progress will be reviewed, emphasizing the "terra incognita" of the primary accretion of planetesimals we observe today as asteroids (the parent bodies of primitive meteorities), comets, and KBOs. Some of the problems and promises of current scenarios will be described.

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