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

Autor: Thomas Stephan, Vicente A. Solé, David Anderson, Jan Leitner, Asna Ansari, Jon K. Hillier, Manfred Burghammer, Ariel Leonard, Anna L. Butterworth, Veerle Sterken, Donald E. Brownlee, Laurence Lemelle, Philipp R. Heck, Mario Trieloff, Janet Borg, Tom Schoonjans, Ralf Srama, Geert Silversmit, Nabil Bassim, Eberhard Grün, Joachim Huth, Scott A. Sandford, R. Lettieri, Zack Gainsforth, Daniel Zevin, Hugues Leroux, Rhonda M. Stroud, Bart Vekemans, William Marchant, Juan-Angel Sans Tresseras, Ron K. Bastien, Bruce Hudson, Ryan C. Ogliore, Tolek Tyliszczak, Akira Tsuchiyama, Carlton Allen, Frank E. Brenker, Frank J. Stadermann, Ryan Doll, Peter Tsou, Brit Hvide, Larry R. Nittler, Naomi Wordsworth, Joshua Von Korff, Hitesh Changela, Michael E. Zolensky, Peter Hoppe, Wei Ja Ong, Sylvia Schmitz, Julien Stodolna, John Bridges, Anton T. Kearsley, D. Frank, Barry Lai, Andrew J. Westphal, Mark C. Price, Alexandre Simionovici, Mark J. Burchell, Frank Postberg, Laszlo Vincze, Steven Sutton, Hans A. Bechtel, Ashley J. King, George J. Flynn, Andrew M. Davis, Christine Floss, Peter Cloetens, Saša Bajt
Přispěvatelé: Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon] (LGL-TPE), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon), Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2014
Předmět:
Zdroj: Meteoritics and Planetary Science
Meteoritics and Planetary Science, Wiley, 2014, 49 (9, SI), pp.1562--1593. ⟨10.1111/maps.12220⟩
Meteoritics and Planetary Science, 2014, 49 (9, SI), pp.1562--1593. ⟨10.1111/maps.12220⟩
ISSN: 1086-9379
1945-5100
Popis: 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.
Databáze: OpenAIRE
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