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Stardust Interstellar Preliminary Examination V: XRF analyses of interstellar dust candidates at ESRF ID13

(2014) METEORITICS & PLANETARY SCIENCE. 49(9). p.1594-1611
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Abstract
Here, we report analyses by synchrotron X-ray fluorescence microscopy of the elemental composition of eight candidate impact features extracted from the Stardust Interstellar Dust Collector (SIDC). Six of the features were unambiguous tracks, and two were crater-like features. Five of the tracks are so-called "midnight" tracks-that is, they had trajectories consistent with an origin either in the interstellar dust stream or as secondaries from impacts on the Sample Return Capsule (SRC). In a companion paper reporting synchrotron X-ray diffraction analyses of ISPE candidates, we show that two of these particles contain natural crystalline materials: the terminal particle of track 30 contains olivine and spinel, and the terminal particle of track 34 contains olivine. Here, we show that the terminal particle of track 30, Orion, shows elemental abundances, normalized to Fe, that are close to CI values, and a complex, fine-grained structure. The terminal particle of track 34, Hylabrook, shows abundances that deviate strongly from CI, but shows little fine structure and is nearly homogenous. The terminal particles of other midnight tracks, 29 and 37, had heavy element abundances below detection threshold. A third, track 28, showed a composition inconsistent with an extraterrestrial origin, but also inconsistent with known spacecraft materials. A sixth track, with a trajectory consistent with secondary ejecta from an impact on one of the spacecraft solar panels, contains abundant Ce and Zn. This is consistent with the known composition of the glass covering the solar panel. Neither crater-like feature is likely to be associated with extraterrestrial materials. We also analyzed blank aerogel samples to characterize background and variability between aerogel tiles. We found significant differences in contamination levels and compositions, emphasizing the need for local background subtraction for accurate quantification.
Keywords
INTERPLANETARY DUST, OLIVINE, AEROGEL

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Chicago
Brenker, FE, AJ Westphal, Laszlo Vincze, Manfred Burghammer, S Schmitz, Tom Schoonjans, Geert Silversmit, et al. 2014. “Stardust Interstellar Preliminary Examination V: XRF Analyses of Interstellar Dust Candidates at ESRF ID13.” Meteoritics & Planetary Science 49 (9): 1594–1611.
APA
Brenker, F., Westphal, A., Vincze, L., Burghammer, M., Schmitz, S., Schoonjans, T., Silversmit, G., et al. (2014). Stardust Interstellar Preliminary Examination V: XRF analyses of interstellar dust candidates at ESRF ID13. METEORITICS & PLANETARY SCIENCE, 49(9), 1594–1611.
Vancouver
1.
Brenker F, Westphal A, Vincze L, Burghammer M, Schmitz S, Schoonjans T, et al. Stardust Interstellar Preliminary Examination V: XRF analyses of interstellar dust candidates at ESRF ID13. METEORITICS & PLANETARY SCIENCE. 2014;49(9):1594–611.
MLA
Brenker, FE, AJ Westphal, Laszlo Vincze, et al. “Stardust Interstellar Preliminary Examination V: XRF Analyses of Interstellar Dust Candidates at ESRF ID13.” METEORITICS & PLANETARY SCIENCE 49.9 (2014): 1594–1611. Print.
@article{5911317,
  abstract     = {Here, we report analyses by synchrotron X-ray fluorescence microscopy of the elemental composition of eight candidate impact features extracted from the Stardust Interstellar Dust Collector (SIDC). Six of the features were unambiguous tracks, and two were crater-like features. Five of the tracks are so-called {\textacutedbl}midnight{\textacutedbl} tracks-that is, they had trajectories consistent with an origin either in the interstellar dust stream or as secondaries from impacts on the Sample Return Capsule (SRC). In a companion paper reporting synchrotron X-ray diffraction analyses of ISPE candidates, we show that two of these particles contain natural crystalline materials: the terminal particle of track 30 contains olivine and spinel, and the terminal particle of track 34 contains olivine. Here, we show that the terminal particle of track 30, Orion, shows elemental abundances, normalized to Fe, that are close to CI values, and a complex, fine-grained structure. The terminal particle of track 34, Hylabrook, shows abundances that deviate strongly from CI, but shows little fine structure and is nearly homogenous. The terminal particles of other midnight tracks, 29 and 37, had heavy element abundances below detection threshold. A third, track 28, showed a composition inconsistent with an extraterrestrial origin, but also inconsistent with known spacecraft materials. A sixth track, with a trajectory consistent with secondary ejecta from an impact on one of the spacecraft solar panels, contains abundant Ce and Zn. This is consistent with the known composition of the glass covering the solar panel. Neither crater-like feature is likely to be associated with extraterrestrial materials. We also analyzed blank aerogel samples to characterize background and variability between aerogel tiles. We found significant differences in contamination levels and compositions, emphasizing the need for local background subtraction for accurate quantification.},
  author       = {Brenker, FE and Westphal, AJ and Vincze, Laszlo and Burghammer, Manfred and Schmitz, S and Schoonjans, Tom and Silversmit, Geert and Vekemans, Bart 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 Bridges, J and Brownlee, DE and Burchell, M and Butterworth, AL and Changela, H and Cloetens, P and Davis, AM and Doll, R and Floss, C and Flynn, G and Fougeray, P and Frank, DR 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 Lai, B 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 Simionovici, AS and Sol{\'e}, VA and Srama, R and Stadermann, F and Stephan, T and Sterken, VJ and Stodolna, J and Stroud, RM and Sutton, S and Trieloff, M and Tsou, P and Tsuchiyama, A and Tyliszczak, T and Von Korff, J and Wordsworth, N and Zevin, D and Zolensky, ME},
  issn         = {1086-9379},
  journal      = {METEORITICS \& PLANETARY SCIENCE},
  keyword      = {INTERPLANETARY DUST,OLIVINE,AEROGEL},
  language     = {eng},
  number       = {9},
  pages        = {1594--1611},
  title        = {Stardust Interstellar Preliminary Examination V: XRF analyses of interstellar dust candidates at ESRF ID13},
  url          = {http://dx.doi.org/10.1111/maps.12206},
  volume       = {49},
  year         = {2014},
}

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