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Iron and nickel isotope compositions of presolar silicon carbide grains from supernovae

Journal Article · · Geochimica et Cosmochimica Acta
 [1];  [2];  [3];  [1];  [4];  [5];  [6]
  1. Max Planck Institute for Chemistry, Mainz (Germany)
  2. University of Chicago, IL (United States). Chicago Center for Cosmochemistry; University of Chicago, IL (United States)
  3. University of Chicago, IL (United States). Chicago Center for Cosmochemistry; University of Chicago, IL (United States); The NuGrid Collaboration, Chicago, IL (United States)
  4. The NuGrid Collaboration, Chicago, IL (United States); University of Hull (United Kingdom)
  5. University of Chicago, IL (United States). Chicago Center for Cosmochemistry; University of Chicago, IL (United States); University of Chicago, IL (United States). Enrico Fermi Institute
  6. University of Chicago, IL (United States). Chicago Center for Cosmochemistry; University of Chicago, IL (United States); University of Chicago, IL (United States). Enrico Fermi Institute; Argonne National Laboratory (ANL), Argonne, IL (United States)
+ Show Author Affiliations
Here we report the carbon, silicon, iron, and nickel isotope compositions of twenty-five presolar SiC grains of mostly supernova (SN) origin. The iron and nickel isotope compositions were measured with the new Chicago Instrument for Laser Ionization, CHILI, which allows the analysis of all iron and nickel isotopes without the isobaric interferences that plagued previous measurements with the NanoSIMS. Despite terrestrial iron and nickel contamination, significant isotopic anomalies in 54Fe/56Fe, 57Fe/56Fe, 60Ni/58Ni, 61Ni/58Ni, 62Ni/58Ni, and 64Ni/58Ni were detected in nine SN grains (of type X). Combined multi-isotope data of three grains with the largest nickel isotope anomalies (>100% or <-100% in at least one isotope ratio, when expressed as deviation from the solar value) are compared with the predictions of two SN models, one with and one without hydrogen ingestion in the He shell prior to SN explosion. One grain's carbon-silicon-iron-nickel isotope composition is consistent with the prediction of the model without hydrogen ingestion, whereas the other two grains' isotope anomalies could not be reproduced using either SN models. The discrepancies between the measured isotope compositions and model predictions may indicate element fractionation in the SN ejecta prior to or during grain condensation, and reiterate the need for three-dimensional SN models.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
European Union (EU); German Research Foundation(DFG); National Aeronautic and Space Administration (NASA); National Science Foundation (NSF); Swiss National Science Foundation (SNSF); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1571449
Journal Information:
Geochimica et Cosmochimica Acta, Journal Name: Geochimica et Cosmochimica Acta Journal Issue: SI Vol. 221; ISSN 0016-7037
Publisher:
Elsevier; The Geochemical Society; The Meteoritical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Chicago instrument for laser ionization
iron isotopes
nickel isotopes
nucleosynthesis
supernova