Other
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..962w&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.962
Other
Scientific paper
We present a new collision model where the results from the latest laboratory experiments are combined with a physical approach that allows us to follow the dust-size evolution from micron-sized grains up to kilometer-sized planetesimals. We take account of various types of collisional outcomes such as bouncing, erosion from monomers and fragmentation with mass transfer, in which only one of the particles fragments and a fraction of it is added to the surface of the other particle. [1, 2, 3] We investigate not only the effect from the model calibrated by the laboratory experiments, but also the importance of different model parameters like the size of the fragmentation and bouncing regions and the mass transfer efficiency. Our new model is powerful enough to quickly test how sensitive the outcome depends on changes of the parameters. The aim is to determine under which circumstances planetesimal formation due to collisional growth is possible. We find that growth through the bouncing and fragmentation barriers is possible, and that fragmentation with mass transfer allows for boulders of several hundred meters in size to be formed by sweeping up the mm-sized dust trapped at the bouncing barrier. These large boulders could possibly constitute the first generation of planetesimals.
Birnstiel Til
Blum Jacques
Dullemond Cornelis Petrus
Güttler Carsten
Ormel Chris W.
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