Coalescence of compact binary and the origin of heavy elements
| Project/Area Number |
16K17706
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Toho University |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | 元素合成 / 中性子星 / 重力波 / 一般相対性理論 / 数値相対論 / 連星中性子星 / 重元素 / 宇宙物理 |
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| Outline of Final Research Achievements |
By performing numerical-relativity simulations of the coalescence of binary neutron stars, we clarified the dynamics of the merger and the subsequent evolution of the system. We also clarified quantitatively the total amount of ejected materials as well as the thermodynamical and chemical properties of them. Using these data obtained, we performed nucleosynthesis calculations that proceed in the ejecta. As a main result, we concluded that the coalescence of binary neutron stars is the promising astrophysical origin of heavy element in the universe.
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| Academic Significance and Societal Importance of the Research Achievements |
1950年代の理論的研究の後、約半世紀にわたって、宇宙における重元素の起源天体は超新星爆発であると考えられてきた。2000年代に超新星爆発の研究が進み、超新星爆発では重元素を効率的に生成することが難しいことが明らかとなり、代わって注目をされたのが中性子星連星の合体である。本研究結果は、重元素の起源が中性子星連星の合体であるとするこの仮設を強く支持するものである。今後のさらなる研究によって、半世紀以上にわたるこの謎に決着がつく可能性がある。
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Report
(5 results)
Research Products
(32 results)
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[Journal Article] Sub-radian-accuracy gravitational waves from coalescing binary neutron stars in numerical relativity. II. Systematic study on the equation of state, binary mass, and mass ratio2020
Author(s)
Kiuchi, K., Kawaguchi, K., Kyutoku, K., Sekiguchi, Y., & Shibata, M.
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Journal Title
Physical Review D
Volume: 101
Issue: 8
Pages: 84006-84006
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Properties of Kilonovae from Dynamical and Post-Merger Ejecta of Neutron Star Mergers2018
Author(s)
Tanaka, M., Kato, D., Gaigalas, G., Rynkun, P., Radziute, L., Wanajo, S., Sekiguchi, Y., Nakamura, N., Tanuma, H., Murakami, I., Sakaue, H. A.
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Journal Title
The Astrophysical Journal
Volume: 852
Issue: 2
Pages: 109-109
DOI
NAID
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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