Modeling Asteroid Impacts into a Volatile-Rich Martian Surface: Hydrocode Validation and Initial Results

Details Modeling Asteroid Impacts into a Volatile-Rich Martian Surface: Hydrocode Validation and Initial Results Modeling Asteroid Impacts into a Volatile-Rich Martian Surface: Hydrocode Validation and Initial Results

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6103p&link_type=abstract

American Astronomical Society, DPS meeting #38, #61.03; Bulletin of the American Astronomical Society, Vol. 38, p.602

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Impact devolatilization has been proposed by Segura et al. (2002) as a possible mechanism for triggering sporadic but intense precipitation on Mars. We seek to examine this hypothesis, specifically to determine the lower bound on possible energy/size scales, and thus an upper bound on the frequency of such events. To do this, we employ various analytical and numerical modeling techniques.
The most sophisticated tool in our box is the RAGE hydrocode. RAGE (Baltrusaitis et al. 1996) is an Eulerian Hydrocode that runs in up to three dimensions and incorporates a variety of detailed equations of state including the temperature-based SESAME tables maintained by LANL. Correct forward modeling requires prior comparison of hydrocode results against analytical models (verification) and laboratory experiments (validation). To that end we compare RAGE against the results of various laboratory experiments (Kato et al. 2001, Nakazawa et al. 2002, Koschny et al. 2001), and analytical crater scaling models (Housen et al. 1983, Holsapple and Schmidt 1982, Holsapple 1993, and Melosh 1989).
From there, we begin to examine the potential effects of impacts on water ice in the Martian subsurface. We will begin by examining the evolution of the temperature profile of an impact into a geologically simple, ice-free target, and explore the effects of an increase in ice content and ice layer morphology from there.
This effort is supported by LANL/IGPP (CSP, RFC, KHW, MLG) and by NASA PG&G "Small Bodies and Planetary Collisions" (EA).

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