Light element isotopic compositions of cometary matter returned by the STARDUST mission

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Hydrogen, carbon, nitrogen, and oxygen isotopic compositions are heterogeneous among comet 81P/Wild2 particle fragments, however extreme isotopic anomalies are rare, indicating that the comet is not a pristine aggregate of presolar materials. Non-terrestrial nitrogen and neon isotope ratios suggest that indigenous organic matter and highly volatile materials were successfully collected. Except for a single circumstellar stardust grain, silicate and oxide minerals have oxygen isotopic compositions consistent with solar system origin. One refractory grain is {sup 16}O-enriched like refractory inclusions in meteorites, suggesting formation in the hot inner solar nebula and large-scale radial transport prior to comet accretion in the outer ... continued below

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McKeegan, K D; Aleon, J; Bradley, J; Brownlee, D; Busemann, H; Butterworth, A et al. October 10, 2006.

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Hydrogen, carbon, nitrogen, and oxygen isotopic compositions are heterogeneous among comet 81P/Wild2 particle fragments, however extreme isotopic anomalies are rare, indicating that the comet is not a pristine aggregate of presolar materials. Non-terrestrial nitrogen and neon isotope ratios suggest that indigenous organic matter and highly volatile materials were successfully collected. Except for a single circumstellar stardust grain, silicate and oxide minerals have oxygen isotopic compositions consistent with solar system origin. One refractory grain is {sup 16}O-enriched like refractory inclusions in meteorites, suggesting formation in the hot inner solar nebula and large-scale radial transport prior to comet accretion in the outer solar system.

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PDF-file: 30 pages; size: 0.7 Mbytes

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  • Journal Name: Science, vol. 314, N/A, December 15, 2006, pp. 1724-1728; Journal Volume: 314

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  • Report No.: UCRL-JRNL-225917
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 902356
  • Archival Resource Key: ark:/67531/metadc878939

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  • October 10, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 7, 2016, 4:43 p.m.

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McKeegan, K D; Aleon, J; Bradley, J; Brownlee, D; Busemann, H; Butterworth, A et al. Light element isotopic compositions of cometary matter returned by the STARDUST mission, article, October 10, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc878939/: accessed January 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.