Protostars and Planets VI, Heidelberg, July 15-20, 2013
Poster 2K095
Modeling Injection with Structured Clouds
Goodson, Matthew (UNC-Chapel Hill)
Heitsch, Fabian (UNC-Chapel Hill)
Abstract:
Meteorite studies indicate that active short-lived radionuclides
(SLRs) were present in the early solar system. While the source of the
SLRs and the mechanism of incorporation are still debated, a common
bottleneck is injecting significant amounts of SLRs into the natal
cloud. We hypothesize that sub-structure in the target molecular cloud
will increase injection efficiencies. We use the Athena code in both
2-D and 3-D hydrodynamics with self-gravity. We simulate the
interaction of a shock wave carrying a tracer scalar with a clumpy
molecular cloud. The injection efficiency is determined by the
fraction of ejecta carried in the shock wave that is incorporated into
collapsing cloud regions. We find 1) this simple sub-structure
increases the injection efficiency in most cases, and 2) injection can
occur at low ejecta speeds. We caution that resolution strongly
affects the mixing, and future simulations will employ MHD, sink particles, and sub-grid viscosity.
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