Physics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933413g&link_type=abstract
American Astronomical Society, AAS Meeting #219, #334.13
Physics
Scientific paper
Meteorite studies indicate that active short-lived radionuclides (SLRs) were incorporated into the pre-solar cloud. A nearby supernova could have provided enrichment, but previous hydrodynamical simulations of such an event have been unable to inject sufficient amounts of SLRs. We hypothesize that sub-structure in the target molecular cloud will increase injection efficiencies. We test this hypothesis by simulating the interaction of a shock wave carrying a tracer scalar with a structured molecular cloud. We model the pre-solar cloud as collection of randomly distributed spheres ("cloudlets"). We use the Athena code in 2-D hydrodynamics with a variety of equations of state, and we measure the fraction of ejecta carried in the shock wave that ends up in relevant cloud densities. Already this simple sub-structure increases the injection efficiency by roughly an order of magnitude. Although this is still below observed injection amounts, it offers a notable improvement. Future simulations in 3-D will employ thermal physics, gravitational potentials, and magnetohydrodynamics.
Goodson Matthew D.
Heitsch Fabian
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