INFERRED INITIAL Al-26/Al-27 RATIOS IN PRESOLAR STARDUST GRAINS FROM SUPERNOVAE ARE HIGHER THAN PREVIOUSLY ESTIMATED
文献类型：期刊论文
| 作者 | Groopman, Evan1; Zinner, Ernst1; Amari, Sachiko1; Gyngard, Frank1; Hoppe, Peter2; Jadhav, Manavi3; Lin, Yangting4; Xu, Yuchen4; Marhas, Kuljeet5; Nittler, Larry R.6 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2015-08-10 |
| 卷号 | 809期号:1 |
| 关键词 | dust, extinction meteorites, meteors, meteoroids nuclear reactions, nucleosynthesis, abundances supernovae: general |
| DOI | 10.1088/0004-637X/809/1/31 |
| 文献子类 | Article |
| 英文摘要 | We performed an in-depth exploration of the Al-Mg system for presolar graphite, SiC, and Si3N4 grains found to contain large excesses of Mg-26, indicative of the initial presence of live Al-26. Ninety of the more than 450 presolar grains processed in this study contain well-correlated delta Mg-26/Mg-24 and Al-27/Mg-24 ratios, derived from Nano-scale Secondary Ion Mass Spectrometer depth profiles, whose isochron-like regression lines yield inferred initial Al-26 Al-27 ratios that, on average, are similar to 1.5-2 times larger than the ratios previously reported for the grains. The majority of presolar graphite and SiC grains are heavily affected by Al contamination, resulting in large negative delta Mg-26/Mg-24 intercepts of the isochron lines. Al contamination is potentially due to etching of the grains' surfaces and subsequent capture of dissolved Al during the acid dissolution of their meteorite host rocks. From the isochron fits, the magnitude of Al contamination was quantified for each grain. The amount of Al contamination on each grain was found to be random and independent of grain size, following a uniform distribution with an upper bound at 59% contamination. The Al contamination causes conventional whole-grain estimates to underpredict the initial Al-26/Al-27 ratios. The presolar grains with the highest Al-26/Al-27 ratios are from Type II supernovae whose isochronderived initial Al-26/Al-27 ratios greatly exceed those predicted in the He/C and He/N zones of SN models. |
| WOS关键词 | SILICON-CARBIDE GRAINS ; GIANT BRANCH STARS ; GAMMA-RAY LINE ; SIC GRAINS ; ISOTOPIC COMPOSITIONS ; GRAPHITE GRAINS ; MURCHISON METEORITE ; INTERSTELLAR GRAINS ; ORDINARY CHONDRITE ; MASSIVE STARS |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000361653500031 |
| 资助机构 | NASA(NNX10AI45G ; NASA(NNX10AI45G ; NNX11AH14G ; NNX11AH14G ; NNX10AI63G) ; NNX10AI63G) ; NASA(NNX10AI45G ; NASA(NNX10AI45G ; NNX11AH14G ; NNX11AH14G ; NNX10AI63G) ; NNX10AI63G) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62241]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 |
| 作者单位 | 1.Washington Univ, Dept Phys, Space Sci Lab, St Louis, MO 63130 USA 2.Max Planck Inst Chem, Particle Chem Dept, D-55020 Mainz, Germany 3.Univ Chicago, Dept Geophys Sci, Chicago, IL 60637 USA 4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China 5.Phys Res Lab, Planetary Sci Div, Ahmadabad 380009, Gujarat, India 6.Carnegie Inst Sci, Dept Terr Magnetism, Washington, DC 20015 USA |
| 推荐引用方式 GB/T 7714 | Groopman, Evan,Zinner, Ernst,Amari, Sachiko,et al. INFERRED INITIAL Al-26/Al-27 RATIOS IN PRESOLAR STARDUST GRAINS FROM SUPERNOVAE ARE HIGHER THAN PREVIOUSLY ESTIMATED[J]. ASTROPHYSICAL JOURNAL,2015,809(1). |
| APA | Groopman, Evan.,Zinner, Ernst.,Amari, Sachiko.,Gyngard, Frank.,Hoppe, Peter.,...&Nittler, Larry R..(2015).INFERRED INITIAL Al-26/Al-27 RATIOS IN PRESOLAR STARDUST GRAINS FROM SUPERNOVAE ARE HIGHER THAN PREVIOUSLY ESTIMATED.ASTROPHYSICAL JOURNAL,809(1). |
| MLA | Groopman, Evan,et al."INFERRED INITIAL Al-26/Al-27 RATIOS IN PRESOLAR STARDUST GRAINS FROM SUPERNOVAE ARE HIGHER THAN PREVIOUSLY ESTIMATED".ASTROPHYSICAL JOURNAL 809.1(2015). |
入库方式： OAI收割
来源：地质与地球物理研究所
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