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Stardust Interstellar Preliminary Examination VIII: Identification of crystalline material in two interstellar candidates

Zack Gainsforth Frank E. Brenker Alexandre S. Simionovici Sylvia Schmitz Manfred Burghammer Anna L. Butterworth Peter Cloetens Laurence Lemelle 1 Juan-Angel Sans Tresserras Tom Schoonjans Geert Silversmit Vicente A. Solé Bart Vekemans Laszlo Vincze Andrew J. Westphal Carlton Allen David Anderson Asna Ansari Saša Bajt Ron K. Bastien Nabil Bassim Hans A. Bechtel Janet Borg John Bridges Donald E. Brownlee Mark Burchell Hitesh Changela Andrew M. Davis Ryan Doll Christine Floss George Flynn Patrick Fougeray David Frank Eberhard Grün Philipp R. Heck Jon K. Hillier Peter Hoppe Bruce Hudson Joachim Huth Brit Hvide Anton Kearsley Ashley J. King Barry Lai Jan Leitner Hugues Leroux Ariel Leonard Robert Lettieri William Marchant Larry R. Nittler Ryan Ogliore Wei Ja Ong Frank Postberg Mark C. Price Scott A. Sandford Ralf Srama Thomas Stephan Veerle Sterken Julien Stodolna Rhonda M. Stroud Steven Sutton Mario Trieloff Peter Tsou Akira Tsuchiyama Tolek Tyliszczak Joshua Von Korff Daniel Zevin Michael E. Zolensky
1 LGL-TPE - Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon]
Abstract : Using synchrotron-based X-ray diffraction measurements, we identified crystalline material in two particles of extraterrestrial origin extracted from the Stardust Interstellar Dust Collector. The first particle, I1047,1,34 (Hylabrook), consisted of a mosaiced olivine grain approximately 1 \textmum in size with internal strain fields up to 0.3%. The unit cell dimensions were a = 4.85 \textpm 0.08 \r A, b = 10.34 \textpm 0.16 \r A, c = 6.08 \textpm 0.13 \r A (2σ). The second particle, I1043,1,30 (Orion), contained an olivine grain ? 2 \textmum in length and 500 nm in width. It was polycrystalline with both mosaiced domains varying over ? 20 and additional unoriented domains, and contained internal strain fields 1%. The unit cell dimensions of the olivine were a = 4.76 \textpm 0.05 \r A, b = 10.23 \textpm 0.10 \r A, c = 5.99 \textpm 0.06 \r A (2σ), which limited the olivine to a forsteritic composition (2σ). Orion also contained abundant spinel nanocrystals of unknown composition, but unit cell dimension a = 8.06 \textpm 0.08 \r A (2σ). Two additional crystalline phases were present and remained unidentified. An amorphous component appeared to be present in both these particles based on STXM and XRF results reported elsewhere.
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Submitted on : Wednesday, November 6, 2019 - 12:12:43 PM
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Zack Gainsforth, Frank E. Brenker, Alexandre S. Simionovici, Sylvia Schmitz, Manfred Burghammer, et al.. Stardust Interstellar Preliminary Examination VIII: Identification of crystalline material in two interstellar candidates. Meteoritics and Planetary Science, Wiley, 2014, 49 (9), pp.1645--1665. ⟨10.1111/maps.12148⟩. ⟨hal-02351162⟩

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