Stardust Interstellar Preliminary Examination IV: Scanning transmission X-ray microscopy analyses of impact features in the Stardust Interstellar Dust Collector

Butterworth, Anna L. and Westphal, Andrew J. and Tyliszczak, Tolek and Gainsforth, Zack and Stodolna, Julien and Frank, David R. and Allen, Carlton and Anderson, David and Ansari, Asna and Bajt, Saša and Bastien, Ron K. and Bassim, Nabil and Bechtel, Hans A. and Borg, Janet and Brenker, Frank E. and Bridges, John and Brownlee, Donald E. and Burchell, Mark J. and Burghammer, Manfred and Changela, Hitesh and Cloetens, Peter and Davis, Andrew M. and Doll, Ryan and Floss, Christine and Flynn, George and Grün, Eberhard and Heck, Philipp R. and Hillier, Jon K. and Hoppe, Peter and Hudson, Bruce and Huth, Joachim and Hvide, Brit and Kearsley, Anton and King, Ashley J. and Lai, Barry and Leitner, Jan and Lemelle, Laurence and Leroux, Hugues and Leonard, Ariel and Lettieri, Robert and Marchant, William and Nittler, Larry R. and Ogliore, Ryan and Ong, Wei Ja and Postberg, Frank and Price, Mark C. and Sandford, Scott A. and Sans? Tresseras, Juan-Angel and Schmitz, Sylvia and Schoonjans, Tom and Silversmit, Geert and Simionovici, Alexandre S. and Solé, Vicente A. and Srama, Ralf and Stadermann, Frank J. and Stephan, Thomas and Sterken, Veerle J. and Stroud, Rhonda M. and Sutton, Steven and Trieloff, Mario and Tsou, Peter and Tsuchiyama, Akira and Vekemans, Bart and Vincze, Laszlo and Von Korff, Joshua and Wordsworth, Naomi and Zevin, Daniel and Zolensky, Michael E. (2014) Stardust Interstellar Preliminary Examination IV: Scanning transmission X-ray microscopy analyses of impact features in the Stardust Interstellar Dust Collector. Meteoritics and Planetary Science, 49 (9). pp. 1562-1593. ISSN 1086-9379. (doi:https://doi.org/10.1111/maps.12220) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://doi.org/10.1111/maps.12220

Abstract

We report the quantitative characterization by synchrotron soft X-ray spectroscopy of 31 potential impact features in the aerogel capture medium of the Stardust Interstellar Dust Collector. Samples were analyzed in aerogel by acquiring high spatial resolution maps and high energy-resolution spectra of major rock-forming elements Mg, Al, Si, Fe, and others. We developed diagnostic screening tests to reject spacecraft secondary ejecta and terrestrial contaminants from further consideration as interstellar dust candidates. The results support an extraterrestrial origin for three interstellar candidates: I1043,1,30 (Orion) is a 3 pg particle with Mg-spinel, forsterite, and an iron-bearing phase. I1047,1,34 (Hylabrook) is a 4 pg particle comprising an olivine core surrounded by low-density, amorphous Mg-silicate and amorphous Fe, Cr, and Mn phases. I1003,1,40 (Sorok) has the track morphology of a high-speed impact, but contains no detectable residue that is convincingly distinguishable from the background aerogel. Twenty-two samples with an anthropogenic origin were rejected, including four secondary ejecta from impacts on the Stardust spacecraft aft solar panels, nine ejecta from secondary impacts on the Stardust Sample Return Capsule, and nine contaminants lacking evidence of an impact. Other samples in the collection included I1029,1,6, which contained surviving solar system impactor material. Four samples remained ambiguous: I1006,2,18, I1044,2,32, and I1092,2,38 were too dense for analysis, and we did not detect an intact projectile in I1044,3,33. We detected no radiation effects from the synchrotron soft X-ray analyses; however, we recorded the effects of synchrotron hard X-ray radiation on I1043,1,30 and I1047,1,34.

Item Type: Article
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Mark Burchell
Date Deposited: 23 Jan 2017 09:20 UTC
Last Modified: 25 Aug 2017 09:49 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/59995 (The current URI for this page, for reference purposes)
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