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Stardust Interstellar Preliminary Examination VII: synchrotron X-ray fluorescence analysis of six Stardust interstellar candidates measured with the Advanced Photon Source 2-ID-D microprobe

(2014) METEORITICS & PLANETARY SCIENCE. 49(9). p.1626-1644
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Abstract
The NASA Stardust spacecraft exposed an aerogel collector to the interstellar dust passing through the solar system. We performed X-ray fluorescence element mapping and abundance measurements, for elements 19 <= Z <= 30, on six "interstellar candidates," potential interstellar impacts identified by Stardust@Home and extracted for analyses in picokeystones. One, I1044,3,33, showed no element hot-spots within the designated search area. However, we identified a nearby surface feature, consistent with the impact of a weak, high-speed particle having an approximately chondritic (CI) element abundance pattern, except for factor-of-ten enrichments in K and Zn and an S depletion. This hot-spot, containing approximately 10 fg of Fe, corresponds to an approximately 350 nm chondritic particle, small enough to be missed by Stardust@Home, indicating that other techniques may be necessary to identify all interstellar candidates. Only one interstellar candidate, I1004,1,2, showed a track. The terminal particle has large enrichments in S, Ti, Cr, Mn, Ni, Cu, and Zn relative to Fe-normalized CI values. It has high Al/Fe, but does not match the Ni/Fe range measured for samples of Al-deck material from the Stardust sample return capsule, which was within the field-of-view of the interstellar collector. A third interstellar candidate, I1075,1,25, showed an Al-rich surface feature that has a composition generally consistent with the Al-deck material, suggesting that it is a secondary particle. The other three interstellar candidates, I1001,1,16, I1001,2,17, and I1044,2,32, showed no impact features or tracks, but allowed assessment of submicron contamination in this aerogel, including Fe hot-spots having CI-like Ni/Fe ratios, complicating the search for CI-like interstellar/interplanetary dust.
Keywords
SOLAR-SYSTEM, ELEMENTS, COMET 81P/WILD-2, ABUNDANCES, DUST

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Citation

Please use this url to cite or link to this publication:

Chicago
Flynn, GJ, SR Sutton, B Lai, S Wirick, C Allen, D Anderson, A Ansari, et al. 2014. “Stardust Interstellar Preliminary Examination VII: Synchrotron X-ray Fluorescence Analysis of Six Stardust Interstellar Candidates Measured with the Advanced Photon Source 2-ID-D Microprobe.” Meteoritics & Planetary Science 49 (9): 1626–1644.
APA
Flynn, G., Sutton, S., Lai, B., Wirick, S., Allen, C., Anderson, D., Ansari, A., et al. (2014). Stardust Interstellar Preliminary Examination VII: synchrotron X-ray fluorescence analysis of six Stardust interstellar candidates measured with the Advanced Photon Source 2-ID-D microprobe. METEORITICS & PLANETARY SCIENCE, 49(9), 1626–1644.
Vancouver
1.
Flynn G, Sutton S, Lai B, Wirick S, Allen C, Anderson D, et al. Stardust Interstellar Preliminary Examination VII: synchrotron X-ray fluorescence analysis of six Stardust interstellar candidates measured with the Advanced Photon Source 2-ID-D microprobe. METEORITICS & PLANETARY SCIENCE. 2014;49(9):1626–44.
MLA
Flynn, GJ, SR Sutton, B Lai, et al. “Stardust Interstellar Preliminary Examination VII: Synchrotron X-ray Fluorescence Analysis of Six Stardust Interstellar Candidates Measured with the Advanced Photon Source 2-ID-D Microprobe.” METEORITICS & PLANETARY SCIENCE 49.9 (2014): 1626–1644. Print.
@article{5911593,
  abstract     = {The NASA Stardust spacecraft exposed an aerogel collector to the interstellar dust passing through the solar system. We performed X-ray fluorescence element mapping and abundance measurements, for elements 19 {\textlangle}= Z {\textlangle}= 30, on six {\textacutedbl}interstellar candidates,{\textacutedbl} potential interstellar impacts identified by Stardust@Home and extracted for analyses in picokeystones. One, I1044,3,33, showed no element hot-spots within the designated search area. However, we identified a nearby surface feature, consistent with the impact of a weak, high-speed particle having an approximately chondritic (CI) element abundance pattern, except for factor-of-ten enrichments in K and Zn and an S depletion. This hot-spot, containing approximately 10 fg of Fe, corresponds to an approximately 350 nm chondritic particle, small enough to be missed by Stardust@Home, indicating that other techniques may be necessary to identify all interstellar candidates. Only one interstellar candidate, I1004,1,2, showed a track. The terminal particle has large enrichments in S, Ti, Cr, Mn, Ni, Cu, and Zn relative to Fe-normalized CI values. It has high Al/Fe, but does not match the Ni/Fe range measured for samples of Al-deck material from the Stardust sample return capsule, which was within the field-of-view of the interstellar collector. A third interstellar candidate, I1075,1,25, showed an Al-rich surface feature that has a composition generally consistent with the Al-deck material, suggesting that it is a secondary particle. The other three interstellar candidates, I1001,1,16, I1001,2,17, and I1044,2,32, showed no impact features or tracks, but allowed assessment of submicron contamination in this aerogel, including Fe hot-spots having CI-like Ni/Fe ratios, complicating the search for CI-like interstellar/interplanetary dust.},
  author       = {Flynn, GJ and Sutton, SR and Lai, B and Wirick, S and Allen, C and Anderson, D and Ansari, A and Bajt, S and Bastien, RK and Bassim, N and Bechtel, HA and Borg, J and Brenker, FE and Bridges, J and Brownlee, DE and Burchell, M and Burghammer, Manfred and Butterworth, AL and Changela, H and Cloetens, P and Davis, AM and Doll, R and Floss, C and Frank, D and Gainsforth, Z and Gr{\"u}n, E and Heck, PR and Hillier, JK and Hoppe, P and Hudson, B and Huth, J and Hvide, B and Kearsley, A and King, AJ and Leitner, J and Lemelle, L and Leroux, H and Leonard, A and Lettieri, R and Marchant, W and Nittler, LR and Ogliore, R and Ong, WJ and Postberg, F and Price, MC and Sandford, SA and Tresseras, JAS and Schmitz, S and Schoonjans, Tom and Silversmit, Geert and Simionovici, A and Sol{\'e}, VA and Srama, R and Stadermann, FJ and Stephan, T and Sterken, V and Stodolna, J and Stroud, RM and Trieloff, M and Tsou, P and Tsuchiyama, A and Tyliszczak, T and Vekemans, Bart and Vincze, Laszlo and Von Korff, J and Westphal, AJ and Wordsworth, N and Zevin, D and Zolensky, ME},
  issn         = {1086-9379},
  journal      = {METEORITICS \& PLANETARY SCIENCE},
  keyword      = {SOLAR-SYSTEM,ELEMENTS,COMET 81P/WILD-2,ABUNDANCES,DUST},
  language     = {eng},
  number       = {9},
  pages        = {1626--1644},
  title        = {Stardust Interstellar Preliminary Examination VII: synchrotron X-ray fluorescence analysis of six Stardust interstellar candidates measured with the Advanced Photon Source 2-ID-D microprobe},
  url          = {http://dx.doi.org/10.1111/maps.12144},
  volume       = {49},
  year         = {2014},
}

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