2023 Fiscal Year Final Research Report
Uncovering the nature of supernovae forming double neutron star close binary systems
| Project/Area Number |
21K13966
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 16010:Astronomy-related
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 超新星爆発 / 恒星進化 |
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| Outline of Final Research Achievements |
The stellar evolutionary pathways to form double neutron star close binary systems are still not fully understood. In this research, we explored observational properties that are unique to ultra-stripped supernovae that have been suggested to form double neutron star close binary systems. We found that progenitors of ultra-stripped supernovae can cause strong mass loss shortly before their explosions, and therefore ultra-stripped supernovae can show the signatures of circumstellar interaction. We found that some supernovae that show strong circumstellar interactions can be related to ultra-stripped supernovae forming double neutron star close binary systems.
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| Free Research Field |
理論天体物理学
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| Academic Significance and Societal Importance of the Research Achievements |
金やプラチナといった鉄より重い元素を合成する中性子星同士の合体に至る二重中性子星近接連星の形成過程は明らかになっていない。本研究では二重中性子星近接連星を形成すると考えられているウルトラ-ストリップト超新星の親星が爆発直前に大規模な質量放出を起こすため、この種の超新星では高密度星周物質の兆候が現れることを明らかにした。これにより中性子星同士の合体に至る前に発生する超新星の特徴が明らかになり、鉄より重い元素の合成に至る過程の理解が深まった。
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