globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1904573117
论文题名:
Lifetimes of interstellar dust from cosmic ray exposure ages of presolar silicon carbide
作者: Heck P.R.; Greer J.; Kööp L.; Trappitsch R.; Gyngard F.; Busemann H.; Maden C.; Ávila J.N.; Davis A.M.; Wieler R.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:4
起始页码: 1884
结束页码: 1889
语种: 英语
英文关键词: Cosmochemistry ; Exposure age dating ; Interstellar dust ; Meteorites ; Presolar grains
Scopus关键词: helium ; helium 3 ; neon ; neon 21 ; silicon carbide ; unclassified drug ; Article ; astronomy ; chemistry ; controlled study ; cosmic radiation ; cosmochemistry ; cosmos ; dust ; interstellar dust ; irradiation ; particle size ; priority journal ; radiation exposure ; radiometric dating ; volume
英文摘要: 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. © 2020 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163500
Appears in Collections:气候变化与战略

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作者单位: Heck, P.R., Robert A. Pritzker Center for Meteoritics and Polar Studies, Field Museum of Natural History, Chicago, IL 60605, United States, Chicago Center for Cosmochemistry, University of Chicago, Chicago, IL 60637, United States, Department of the Geophysical Sciences, University of Chicago, Chicago, IL 60637, United States; Greer, J., Robert A. Pritzker Center for Meteoritics and Polar Studies, Field Museum of Natural History, Chicago, IL 60605, United States, Chicago Center for Cosmochemistry, University of Chicago, Chicago, IL 60637, United States, Department of the Geophysical Sciences, University of Chicago, Chicago, IL 60637, United States; Kööp, L., Robert A. Pritzker Center for Meteoritics and Polar Studies, Field Museum of Natural History, Chicago, IL 60605, United States, Chicago Center for Cosmochemistry, University of Chicago, Chicago, IL 60637, United States, Department of the Geophysical Sciences, University of Chicago, Chicago, IL 60637, United States; Trappitsch, R., Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, CA 94550, United States; Gyngard, F., Physics Department, Washington University, St. Louis, MO 63130, United States, Center for NanoImaging, Harvard Medical School, Cambridge, MA 02139, United States; Busemann, H., Institute of Geochemistry and Petrology, ETH Zürich, Zürich, 8092, Switzerland; Maden, C., Institute of Geochemistry and Petrology, ETH Zürich, Zürich, 8092, Switzerland; Ávila, J.N., Research School of Earth Sciences, Australian National University, Canberra, ACT 2601, Australia; Davis, A.M., Robert A. Pritzker Center for Meteoritics and Polar Studies, Field Museum of Natural History, Chicago, IL 60605, United States, Chicago Center for Cosmochemistry, University of Chicago, Chicago, IL 60637, United States, Department of the Geophysical Sciences, University of Chicago, Chicago, IL 60637, United States, Enrico Fermi Institute, University of Chicago, Chicago, IL 60637, United States; Wieler, R., Institute of Geochemistry and Petrology, ETH Zürich, Zürich, 8092, Switzerland

Recommended Citation:
Heck P.R.,Greer J.,Kööp L.,et al. Lifetimes of interstellar dust from cosmic ray exposure ages of presolar silicon carbide[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(4)
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