Interstellar dust components in meteorites: Implications for a comet nucleus sample return

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Comet Nuclei, Cosmic Dust, Interstellar Matter, Meteorites, Carbon 13, Chemical Composition, Gas Analysis, Nitrogen Isotopes, Rare Gases, Solar Corona

Scientific paper

Measurements of noble gas, carbon, and nitrogen isotopes in residues obtained from primitive meteorites by acid dissolution and chemical oxidation are discussed. They suggest that interstellar dust grains survived intact the processes involved in condensation from the solar nebula. The state of knowledge, which recognizes at least 3 carbonaceous dust components, C alpha, Beta, and delta, 2 enriched and 1 depleted in C 13 with distinct noble gas signatures Ne-E(L), s-Xe and Xe(HL) respectively is reviewed. The latter component is also distinguished by nitrogen enriched in N14. Other nitrogen isotope measurements point to the existence of additional extrasolar material, possibly carbonaceous or sulfides. It is anticipated that interstellar dust grains could be a major contributor to comet nuclei.

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