| 研究課題/領域番号 |
19K23456
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| 研究機関 | 東京大学 |
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研究代表者 |
姜 継安 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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| 研究期間 (年度) |
2019-08-30 – 2021-03-31
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| キーワード | Supernova / Observation / Survey / Transient / Time-domain |
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| 研究実績の概要 |
A series of observations with the 8.2-m Subaru telescope were carried out in 2019. Although the observations suffered from severe weather and technical issues, dozens of type Ia supernovae (SNe Ia) were discovered and follow-up observations were successfully carried out for some early-phase SNe Ia through the international collaboration.
A scientific paper based on previous Subaru observations was published in this fiscal year. We discovered seven early-phase SNe Ia and one of them (HSC17bmhk) shows peculiar brightness excess likely due to radiation from radioactive decay of elements at the SN's surface. With more HSC17bmhk-like SNe Ia discovered in the future, we are able to figure out the origin of SN Ia diversity and improve the accuracy of using SNe Ia as the cosmic distance indicator.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
Although we experienced both weather and technical issues during the Subaru observations in 2019, a promising number of early-phase SNe Ia were successfully discovered. Further understandings of the progenitor system and explosion physics of SNe Ia can be achieved with statistical analysis by merging the current sample with early-phase SNe Ia discovered in the upcoming observations. Moreover, one scientific paper has been published already, showing the advantage of carrying out early-phase SN Ia study through our projects. More scientific outputs can be expected once the scheduled observations are successfully carried out in 2020.
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| 今後の研究の推進方策 |
Given the great advantage of studying transients with Japanese wide-field survey facilities, we plan to keep carrying out survey observations with Subaru/Hyper Suprime-Cam to study the progenitor and explosion physics of the SN Ia. At the meanwhile, joint observations with other survey telescopes such as the 1.05-m Kiso Schmidt telescopes are in preparation, which aims to search transients that show significant variance in hours, minutes, or even seconds ("fast-evolving transients"). The origin of such kind of transients are still under debate and dozens of fast-evolving transients can be discovered in a few years. The great number of early-phase SNe Ia and fast-evolving transients discovered in the upcoming years will make our team a leading role in these fields of time-domain astronomy.
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| 次年度使用額が生じた理由 |
The grant was started from the second half year of the FY2019 as the application was in April, 2019. In order to purchase computer and accessories for processing large amount of observational data in 2020, attend international/domestic conferences, pay paper publication fees and so on, more expenses are expected in the FY2020.
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