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Title: Lifetimes of interstellar dust from cosmic ray exposure ages of presolar silicon carbide

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
ORCiD logo [1];  [1];  [1];  [2];  [3];  [4];  [4];  [5];  [6];  [4]
  1. The Field Museum of Natural History, Chicago, IL (United States). Robert A. Pritzker Center for Meteoritics and Polar Studies; Univ. of Chicago, IL (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Washington Univ., St. Louis, MO (United States); Harvard Medical School, Cambridge, MA (United States). Center for NanoImaging
  4. ETH Zurich (Switzerland)
  5. Australian National Univ., Canberra, ACT (Australia)
  6. The Field Museum of Natural History, Chicago, IL (United States). Robert A. Pritzker Center for Meteoritics and Polar Studies; Univ. of Chicago, IL (United States). Enrico Fermi Inst.

In this work, we determined interstellar cosmic ray exposure ages of 40 large presolar silicon carbide grains extracted from the Murchison CM2 meteorite. Our ages, based on cosmogenic Ne-21, range from 3.9 ± 1.6 Ma to ~3 ± 2 Ga before the start of the Solar System ~4.6 Ga ago. A majority of the grains have interstellar lifetimes of <300 Ma, which is shorter than theoretical estimates for large grains. These grains condensed in outflows of asymptotic giant branch stars <4.9 Ga ago that possibly formed during an episode of enhanced star formation ~7 Ga ago. A minority of the grains have ages >1 Ga. Longer lifetimes are expected for large grains. We determined that at least 12 of the analyzed grains were parts of aggregates in the interstellar medium: The large difference in nuclear recoil loss of cosmic ray spallation products 3He and 21Ne enabled us to estimate that the irradiated objects in the interstellar medium were up to 30 times larger than the analyzed grains. Furthermore, we estimate that the majority of the grains acquired the bulk of their cosmogenic nuclides in the interstellar medium and not by exposure to an enhanced particle flux of the early active sun.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-07NA27344; 19-FS-028; NNX11AG77G; NNX15AC53G; 80NSSC19K050; NNX15AF78G; 80NSSC17K025; DGE-1144082; DGE-1746045
OSTI ID:
1582671
Alternate ID(s):
OSTI ID: 1642486
Report Number(s):
LLNL-JRNL-779857; 974526; TRN: US2201911
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 117, Issue 4; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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