Unraveling the hypothesis that a neutron star merger is the origin of r-process elements, based on the understanding of galaxy evolution and nucleosynthesis
| Project/Area Number |
15K05033
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
Wanajo Sinya 上智大学, 理工学部, 准教授 (30327879)
Ishigaki Miho 東京大学, カブリ数物連携宇宙研究機構, 研究員 (30583611)
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| Research Collaborator |
Nishimura Nobuya
Bekki Kenji
Gerhard Hensler
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | r過程元素 / 中性子星合体 / 元素合成 / 銀河化学進化 / 磁気駆動型超新星 / 矮小銀河 / 銀河進化 / 強磁場超新星 / 隕石 |
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| Outline of Final Research Achievements |
The astrophysical origin of elements formed through rapid neutron-capture process, so-called r-process, such as gold and platinum has not been identified yet. Last summer in 2017, we have caught the compelling signature of binary neutron star mergers as the site of r-process. However, we have only one sample and some observational results challenge the claim that a neutron star merger is the sole site of r-process. In this study, we have assessed this issue from the unique approach using stellar abundances as the diagnosis of r-process origin. We eventually got o the conclusion that stellar abundances in nearby dwarf galaxies support neutron star mergers as the r-process site but require specific supernovae -magnetorotational supernovae- at the early stage of galaxy evolution.
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Report
(4 results)
Research Products
(25 results)
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[Journal Article] Line-depth Ratios in H-band Spectra to Determine Effective Temperatures of G- and K-type Giants and Supergiants2015
Author(s)
Fukue, Kei; Matsunaga, Noriyuki; Yamamoto, Ryo; Kondo, Sohei; Kobayashi, Naoto; Ikeda, Yuji; Hamano, Satoshi; Yasui, Chikako; Arasaki, Takayuki; Tsujimoto, Takuji; Bono, Giuseppe; Inno, Laura
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Journal Title
The Astrophysical Journal
Volume: 812
Issue: 1
Pages: 64-64
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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