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DOI | 10.1073/pnas.1904573117 |
Lifetimes of interstellar dust from cosmic ray exposure ages of presolar silicon carbide | |
Heck, Philipp R.1,2,3; Greer, Jennika1,2,3; Koop, Levke1,2,3; Trappitsch, Reto4; Gyngard, Frank5,6; Busemanng, Henner7; Maden, Colin7; Avila, Janaina N.8; Davis, Andrew M.1,2,3,9; Wieler, Rainer7 | |
2020-01-28 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2020 |
卷号 | 117期号:4页码:1884-1889 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Switzerland; Australia |
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 similar to 3 +/- 2 Ga before the start of the Solar System similar to 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 similar to 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 He-3 and Ne-21 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. |
英文关键词 | interstellar dust presolar grains exposure age dating cosmochemistry meteorites |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000509791700015 |
WOS关键词 | STAR-FORMATION HISTORY ; SPALLATION RECOIL ; GRAINS ; METEORITES ; NE ; HE ; DESTRUCTION ; HELIUM ; SHOCKS ; GALAXY |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/249633 |
专题 | 地球科学 |
作者单位 | 1.Field Museum Nat Hist, Robert A Pritzker Ctr Meteorit & Polar Studies, Chicago, IL 60605 USA; 2.Univ Chicago, Chicago Ctr Cosmochem, Chicago, IL 60637 USA; 3.Univ Chicago, Dept Geophys Sci, 5734 S Ellis Ave, Chicago, IL 60637 USA; 4.Lawrence Livermore Natl Lab, Nucl & Chem Sci Div, Livermore, CA 94550 USA; 5.Washington Univ, Phys Dept, St Louis, MO 63130 USA; 6.Harvard Med Sch, Ctr NanoImaging, Cambridge, MA 02139 USA; 7.Swiss Fed Inst Technol, Inst Geochem & Petrol, CH-8092 Zurich, Switzerland; 8.Australian Natl Univ, Res Sch Earth Sci, GPO Box 4, Canberra, ACT 2601, Australia; 9.Univ Chicago, Enrico Fermi Inst, 5640 S Ellis Ave, Chicago, IL 60637 USA |
推荐引用方式 GB/T 7714 | Heck, Philipp R.,Greer, Jennika,Koop, Levke,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,2020,117(4):1884-1889. |
APA | Heck, Philipp R..,Greer, Jennika.,Koop, Levke.,Trappitsch, Reto.,Gyngard, Frank.,...&Wieler, Rainer.(2020).Lifetimes of interstellar dust from cosmic ray exposure ages of presolar silicon carbide.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,117(4),1884-1889. |
MLA | Heck, Philipp R.,et al."Lifetimes of interstellar dust from cosmic ray exposure ages of presolar silicon carbide".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 117.4(2020):1884-1889. |
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