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Isotopic compositions of cometary matter returned by Stardust
Authors:McKeegan Kevin D  Aléon Jerome  Bradley John  Brownlee Donald  Busemann Henner  Butterworth Anna  Chaussidon Marc  Fallon Stewart  Floss Christine  Gilmour Jamie  Gounelle Matthieu  Graham Giles  Guan Yunbin  Heck Philipp R  Hoppe Peter  Hutcheon Ian D  Huth Joachim  Ishii Hope  Ito Motoo  Jacobsen Stein B  Kearsley Anton  Leshin Laurie A  Liu Ming-Chang  Lyon Ian  Marhas Kuljeet  Marty Bernard  Matrajt Graciela  Meibom Anders  Messenger Scott  Mostefaoui Smail  Mukhopadhyay Sujoy  Nakamura-Messenger Keiko  Nittler Larry  Palma Russ  Pepin Robert O  Papanastassiou Dimitri A  Robert François  Schlutter Dennis  Snead Christopher J
Affiliation:Department of Earth and Space Sciences, University of California Los Angeles, Los Angeles, CA 90095-1567, USA. mckeegan@ess.ucla.edu
Abstract:Hydrogen, carbon, nitrogen, and oxygen isotopic compositions are heterogeneous among comet 81P/Wild 2 particle fragments; however, extreme isotopic anomalies are rare, indicating that the comet is not a pristine aggregate of presolar materials. Nonterrestrial nitrogen and neon isotope ratios suggest that indigenous organic matter and highly volatile materials were successfully collected. Except for a single (17)O-enriched circumstellar stardust grain, silicate and oxide minerals have oxygen isotopic compositions consistent with solar system origin. One refractory grain is (16)O-enriched, like refractory inclusions in meteorites, suggesting that Wild 2 contains material formed at high temperature in the inner solar system and transported to the Kuiper belt before comet accretion.
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