Physics – Condensed Matter
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aps..shk.n1046b&link_type=abstract
American Physical Society, 16th APS Topical Conference on Shock Compression of Condensed Matter, June 28-July 3, 2009, abstract
Physics
Condensed Matter
Scientific paper
The NASA Stardust mission collected freshly ejected dust from comet 81P/Wild 2 during a fly by at 6.1 km s-1 in 2004 (in what was in effect a real life shock/recovery experiment), and returned its samples to Earth in 2006 (Brownlee et al., Science 314, 1711 -- 1716, 2006). The collecting media were aerogel and aluminum foil. We will present laboratory data from an extensive series of light gas gun experiments at 6.1 km s-1 on these media. For aluminum targets, the shock pressures (˜60 -- 100 GPa) extensively disrupt the impactors, leaving residue in craters. Using SEM-EDX and Raman spectroscopy we show that it is nevertheless possible in some cases to reconstruct both projectile elemental composition and mineralogy. Capture in aerogel is less destructive, but still modifies the impactors (shock pressures ˜1 GPa). The processing during aerogel capture and the resulting biases introduced in determining particle size, shape and mineralogy will be discussed. Examples of real Stardust cometary dust samples will be shown to illustrate the results.
Burchell Mark
Foster Nicholas
Kearsley Anton
Wozniakiewicz Penny
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