| Project/Area Number |
19K23456
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0204:Astronomy, earth and planetary science, and related fields
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Jiang Jian 東京大学, カブリ数物連携宇宙研究機構, 特任研究員 (00846503)
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| Project Period (FY) |
2019-08-30 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | Supernova / Observation / Survey / Transient / Time-domain / Astronomy / Cosmology |
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| Outline of Research at the Start |
Although the type Ia supernova (SN Ia) have been applied as the cosmic distance indicator and helped us to discover the accelerating expansion of the Universe, their nature is still under debate. Given that observational information on SNe Ia soon after explosion is the best indicator of the origin of SNe Ia, we are carrying out a unique project that is optimized to study early-phase SNe Ia with the best survey facility in the world, the Hyper Suprime-Cam (HSC) mounted on the Subaru telescope. Breakthroughs on the long-standing issues of SNe Ia can be achieved with this innovative project.
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| Outline of Final Research Achievements |
Our team carried out a series of observations with the 8.2m Subaru telescope from 2019 to 2021. Over 10 early-phase Type Ia supernovae (SNe Ia) have been discovered by Subaru/HSC and follow-up observations have been conducted for most of them by using various telescopes through domestic and international collaborations. On the other hand, another early-phase SN Ia that shows interesting features has been found by the Tomo-e Gozen transient survey. These early-phase SNe Ia helped us to further understand the explosion mechanism and progenitor system of specific SN Ia subclasses. In addition, a fast-evolving ultra-luminous transient, MUSSES2020J, has been discovered by our Subaru observation in 2020, which provides a unique opportunity of studying these rare and extreme astronomical phenomena in the universe. Three scientific papers based on the Subaru/HSC observations have already been published/accepted.
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| Academic Significance and Societal Importance of the Research Achievements |
Ia型超新星は宇宙膨張測定に用いられてきているが、その起源はよくわかっていない。早期観測によって起源解明への重要な情報をえることができ、将来より高精度な宇宙膨張測定が可能になることが期待される。
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