2023 Fiscal Year Research-status Report
Fast Transient Study with Deep-Imaging Surveys and Synergistic Observations
| Project/Area Number |
22K14069
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
姜 継安 国立天文台, 科学研究部, 特別客員研究員 (00846503)
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| Project Period (FY) |
2022-04-01 – 2027-03-31
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| Keywords | Supernova / Observation / Transient / Survey / Time-domain |
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| Outline of Annual Research Achievements |
A series of observations were carried out with worldwide observing facilities (e.g., 8.2m Subaru/HSC, 3.8m Seimei/TriCCS, 3.5m ARC, 2.5m WFST) in FY2022. A dozen of early-phase supernovae have been discovered and follow-up observations have been carried out via international collaborations successfully. With a promising number of early-phase type Ia supernovae discovered in FY2023, the long-standing progenitor and explosion issues of type Ia supernovae have been further investigated. Moreover, a promising number of early-phase core-collapse supernovae and fast blue optical transients have been successfully discovered with the new survey facility WFST in FY2023. Total four papers related to fast transients and transient surveys have been published in FY2023.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
A promising number of fast transients have been successfully discovered. By combining the current sample with early-phase supernovae discovered in the future observations, further understandings of the progenitor and explosion physics of supernovae can be achieved through statistical analysis. One scientific paper with data taken from Subaru has been published and a few more papers are in preparation, indicating the great advantage of carrying out not only supernova but other transient studies through our project. Moreover, a few papers by collaborating with other observing facilities have been published and more scientific outputs can be expected with the next generation ground-based (e.g. WFST) and space-borne survey facilities (e.g. EP) in FY2024.
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| Strategy for Future Research Activity |
We plan to keep carrying out survey observations with Subaru/Hyper Suprime-Cam to study the nature of fast transients. At the meanwhile, international collaborations with new generation survey facilities such as the 2.5-m Wide Field Survey Telescope (WFST) and Einstein Probe (EP), which are designed to study fast transients that show distinct variance in hours, minutes, or even seconds at different wavelength ranges. The origin of most previously discovered fast transients are still under debate and we expect to find hundreds of fast transients in the next few years. The great number of fast transients in the coming years will make our team a leading role of carrying out related studies in the world.
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| Causes of Carryover |
I did not execute the grant in FY2023 as related researches are mainly based on data obtained in the past. In FY2024, the remaining grant will be mainly used for trips (visits and meetings) and onsite observations in Japan.
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