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Stardust interstellar preliminary examination - First results

A. J. Westphal 1 C. Allen 2 S. Bajt 3 Renaud Bastien 2 H. A. Bechtel 4 J. Borg 5 F. Brenker 6 G. Bridges 7 D. E. Brownlee 8 A. L. Butterworth 1 M. Burchell 9 Manfred Burghammer 10 B. Clark 11 G. Cody 12 C. Floss 13 G. Flynn 14 D. Frank 1 Z. Gainsforth 1 E. Grün 15 P. Hoppe 16 A. Kearsley 17 N. Kelley 1 H. Leroux 18 L. R. Nittler 12 R. Lettieri 1 B. Mendez 1 W. Marchant 1 S. A. Sandford 19 Alexandre Simionovici 20 F. Stadermann 13 Z. Sternovsky 21 R. M. Stroud 22 S. Sutton 23 P. Tsou 24 A. Tsuchiyama 25 T. Tyliczszak 4 B. Vekemans 26 L. Vincze 26 J. Warren 2 M. E. Zolensky 2
Abstract : The Stardust spacecraft exposed an aerogel and aluminum foil collector to the interstellar dust stream for a total of 195 days before its encounter with Comet P81/Wild2. We report the first results of the Stardust Interstellar Preliminary Examination. This is a formidable task because of the large collecting area (~1000 cm 2), the small expected statistics (a few dozen particles), the diminutive size of the captured particles (<1μm), the challenging nature of the collecting media, and the requirement that only minimally destructive techniques be used. We have close coupling between state of the art techniques and these challenging samples. The first analyses have been performed using aerogel keystones and picokeystones [1] extracted directly from the Stardust Interstellar Collector in order to preserve trajectory information. In the first analyses we have focused on contamination and beam damage assessment, and on the composition of high-angle tracks that we considered to be likely secondary ejecta from impacts of meteoroids on the spacecraft. These tracks were discovered by a consortium of >23,000 “citizen scientists” worldwide using the Stardust@home virtual microscope tools. We have confirmed this identification of secondary ejecta by the identification of Ce and Zn in these particles, but also detected evidence for extraterrestrial material from the original impactors in the form of Fe, Ni and Mg. FTIR and STXM analyses give quantitative upper limits on extraterrestrial organics, and have allowed for the quantitative evaluation of beam damage and carbon deposition during analyses. We have also identified alumina as a contaminant in the aerogel. No measurements have yet been made on the Al foil collectors.
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Submitted on : Wednesday, April 1, 2009 - 12:03:48 PM
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  • HAL Id : insu-00372486, version 1



A. J. Westphal, C. Allen, S. Bajt, Renaud Bastien, H. A. Bechtel, et al.. Stardust interstellar preliminary examination - First results. Meteoritics and Planetary Science, Wiley, 2008, 43 (7), pp.A169. ⟨insu-00372486⟩



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