Modeling of Jet Formation on Comet 103P/Hartley 2

Details Modeling of Jet Formation on Comet 103P/Hartley 2 Modeling of Jet Formation on Comet 103P/Hartley 2

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1411s&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1411

Computer Science

Scientific paper

Based upon the premise that surface-controlled processes may contribute to jet formation, we have run simulations of cometary jet activity using CALE [3], a 2-D Arbitrary Lagrangian Eulerian hydrodynamical code developed by Lawrence Livermore National Laboratory (LLNL). The setup for our numerical study is based loosely on the qualitative model for the evolution of a vent suggested in [4], where a structural weakness within the comet's dusty mantle leads to a slumping of warm material into underlying frozen volatiles and a resulting activation of the jet. Results from models using various vent geometries suggest that the mechanism for collimation may be tied to the depthto- width ratio of the vent. As time elapses, the width of the source region expands. Source regions that are enriched in highly volatile CO2 are observed to remain more tightly collimated. Entrained dust and water ice particles comprise the majority of the collimated portion of the flow, while CO2 appears to drive the process. Acceleration near the surface is sufficient to entrain μm-sized grains, which is consistent with theoretical calculations for scattering by icy grains in [2].

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