title: Isotopic compositions of cometary matter returned by Stardust.
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.
authors.affiliation: Department of Earth and Space Sciences, University of California Los Angeles, Los Angeles, CA 90095-1567, USA. mckeegan@ess.ucla.edu
authors.forename: Kevin D
authors.initials: KD
authors.lastname: McKeegan
authors.forename: Jerome
authors.initials: J
authors.lastname: Aléon
authors.forename: John
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authors.lastname: Bradley
authors.forename: Donald
authors.initials: D
authors.lastname: Brownlee
authors.forename: Henner
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authors.lastname: Busemann
authors.forename: Anna
authors.initials: A
authors.lastname: Butterworth
authors.forename: Marc
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authors.lastname: Chaussidon
authors.forename: Stewart
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authors.lastname: Fallon
authors.forename: Christine
authors.initials: C
authors.lastname: Floss
authors.forename: Jamie
authors.initials: J
authors.lastname: Gilmour
authors.forename: Matthieu
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authors.lastname: Gounelle
authors.forename: Giles
authors.initials: G
authors.lastname: Graham
authors.forename: Yunbin
authors.initials: Y
authors.lastname: Guan
authors.forename: Philipp R
authors.initials: PR
authors.lastname: Heck
authors.forename: Peter
authors.initials: P
authors.lastname: Hoppe
authors.forename: Ian D
authors.initials: ID
authors.lastname: Hutcheon
authors.forename: Joachim
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authors.lastname: Huth
authors.forename: Hope
authors.initials: H
authors.lastname: Ishii
authors.forename: Motoo
authors.initials: M
authors.lastname: Ito
authors.forename: Stein B
authors.initials: SB
authors.lastname: Jacobsen
authors.forename: Anton
authors.initials: A
authors.lastname: Kearsley
authors.forename: Laurie A
authors.initials: LA
authors.lastname: Leshin
authors.forename: Ming-Chang
authors.initials: MC
authors.lastname: Liu
authors.forename: Ian
authors.initials: I
authors.lastname: Lyon
authors.forename: Kuljeet
authors.initials: K
authors.lastname: Marhas
authors.forename: Bernard
authors.initials: B
authors.lastname: Marty
authors.forename: Graciela
authors.initials: G
authors.lastname: Matrajt
authors.forename: Anders
authors.initials: A
authors.lastname: Meibom
authors.forename: Scott
authors.initials: S
authors.lastname: Messenger
authors.forename: Smail
authors.initials: S
authors.lastname: Mostefaoui
authors.forename: Sujoy
authors.initials: S
authors.lastname: Mukhopadhyay
authors.forename: Keiko
authors.initials: K
authors.lastname: Nakamura-Messenger
authors.forename: Larry
authors.initials: L
authors.lastname: Nittler
authors.forename: Russ
authors.initials: R
authors.lastname: Palma
authors.forename: Robert O
authors.initials: RO
authors.lastname: Pepin
authors.forename: Dimitri A
authors.initials: DA
authors.lastname: Papanastassiou
authors.forename: François
authors.initials: F
authors.lastname: Robert
authors.forename: Dennis
authors.initials: D
authors.lastname: Schlutter
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Snead
authors.forename: Frank J
authors.initials: FJ
authors.lastname: Stadermann
authors.forename: Rhonda
authors.initials: R
authors.lastname: Stroud
authors.forename: Peter
authors.initials: P
authors.lastname: Tsou
authors.forename: Andrew
authors.initials: A
authors.lastname: Westphal
authors.forename: Edward D
authors.initials: ED
authors.lastname: Young
authors.forename: Karen
authors.initials: K
authors.lastname: Ziegler
authors.forename: Laurent
authors.initials: L
authors.lastname: Zimmermann
authors.forename: Ernst
authors.initials: E
authors.lastname: Zinner
mesh_terms: D002247:Carbon Isotopes / Q000032:analysis*; D003903:Deuterium / Q000032:analysis*; D006859:Hydrogen / Q000032:analysis; D007554:Isotopes / Q000032:analysis*; D019110:Meteoroids; D009356:Neon / Q000032:analysis; D009587:Nitrogen Isotopes / Q000032:analysis*; D005741:Noble Gases / Q000032:analysis; D010103:Oxygen Isotopes / Q000032:analysis*; D018531:Spacecraft
chemical_list: D002247:Carbon Isotopes; D007554:Isotopes; D009587:Nitrogen Isotopes; D005741:Noble Gases; D010103:Oxygen Isotopes; D009356:Neon; D006859:Hydrogen; D003903:Deuterium