Fast Transient Study with Deep-Imaging Surveys and Synergistic Observations

• 研究課題/領域番号: 22K14069
• 研究種目: 若手研究
• 配分区分: 基金
• 審査区分: 小区分16010:天文学関連
• 研究機関: 国立天文台
• 研究代表者: 姜 継安 国立天文台, 科学研究部, 特別客員研究員 (00846503)
• 研究期間 (年度): 2022-04-01 – 2027-03-31
• 研究課題ステータス: 交付 (2023年度)
• 配分額: 4,550千円 (直接経費: 3,500千円、間接経費: 1,050千円); 2026年度: 650千円 (直接経費: 500千円、間接経費: 150千円); 2025年度: 910千円 (直接経費: 700千円、間接経費: 210千円); 2024年度: 910千円 (直接経費: 700千円、間接経費: 210千円); 2023年度: 1,170千円 (直接経費: 900千円、間接経費: 270千円); 2022年度: 910千円 (直接経費: 700千円、間接経費: 210千円)
• キーワード: Supernova / Observation / Transient / Survey / Time-domain / Time-domain astronomy / Wide-field survey / Multi-wavelength

研究開始時の研究の概要

A transient with fast brightness variance in UV/optical wavelengths ("fast transient") is of great interest in time-domain astronomy as their extreme properties not only relate to various aspects of astrophysics but help us to understand fundamental issues in cosmology. By carrying out innovative survey projects that are optimized to study fast transients with world-class survey facilities and follow-up network, we will carry out systematical studies of fast transients obtained from ongoing and forthcoming surveys. New findings of these intriguing transients can be expected in the near future.

研究実績の概要

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.

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

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.

今後の研究の推進方策

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.

研究成果

• [雑誌論文] AT 2023lli: A Tidal Disruption Event with Prominent Optical Early Bump and Delayed Episodic X-Ray Emission (2024)
  • 著者名/発表者名: Huang Shifeng、Jiang Ning、Zhu Jiazheng、Wang Yibo、Wang Tinggui、Wang Shan-Qin、Gan Wen-Pei、Liang En-Wei、Qin Yu-Jing、Lin Zheyu、Xu Lin-Na、Cai Min-Xuan、Jiang Ji-an, et al.
  • 雑誌名: The Astrophysical Journal Letters 巻: 964 号: 2 ページ: L22-L22
  • DOI: 10.3847/2041-8213/ad319f
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] Science with the 2.5-meter Wide Field Survey Telescope (WFST) (2023)
  • 著者名/発表者名: Wang Tinggui、Liu Guilin、Cai Zhenyi、Geng Jinjun、Fang Min、He Haoning、Jiang Ji-an, et al.
  • 雑誌名: Science China Physics, Mechanics & Astronomy 巻: 66 号: 10 ページ: 1-48
  • DOI: 10.1007/s11433-023-2197-5
  • 査読あり / 国際共著
• [雑誌論文] Basic Survey Scheduling for the Wide Field Survey Telescope (WFST) (2023)
  • 著者名/発表者名: Chen Yan-Peng、Jiang Ji-An、Luo Wen-Tao、Zheng Xian-Zhong、Fang Min、Yang Chao、Hong Yuan-Yu、Lv Zong-Fei
  • 雑誌名: Research in Astronomy and Astrophysics 巻: 24 号: 1 ページ: 015003-015003
  • DOI: 10.1088/1674-4527/ad07cd
  • 査読あり / 国際共著
• [雑誌論文] Initial flash and spectral formation of Type Ia supernovae with an envelope: applications to overluminous SNe Ia (2023)
  • 著者名/発表者名: Maeda Keiichi, Jiang Ji-an, Doi Mamoru, Kawabata Miho, Shigeyama Toshikazu
  • 雑誌名: Monthly Notices of the Royal Astronomical Society 巻: 521 号: 2 ページ: 1897-1907
  • DOI: 10.1093/mnras/stad618
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] MUSSES2020J: The Earliest Discovery of a Fast Blue Ultraluminous Transient at Redshift 1.063 (2022)
  • 著者名/発表者名: Jiang Ji-an、Yasuda Naoki、Maeda Keiichi、Tominaga Nozomu、Doi Mamoru、Yoachim Peter、Uno Kohki、Moriya Takashi J.、Kumar Brajesh、Pan Yen-Chen、Tanaka Masayuki、Tanaka Masaomi、Nomoto Ken’ichi、Jha Saurabh W.、Ruiz-Lapuente Pilar、Jones David、Shigeyama Toshikazu、Suzuki Nao et al.
  • 雑誌名: The Astrophysical Journal Letters 巻: 933 号: 2 ページ: L36-L36
  • DOI: 10.3847/2041-8213/ac7390
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] A repeating fast radio burst associated with a persistent radio source (2022)
  • 著者名/発表者名: Niu C.-H., Aggarwal K., Li D., Zhang X., Chatterjee S., Tsai C.-W., Yu W., Law C. J., Burke-Spolaor S., Cordes J. M., Zhang Y.-K., Ocker S. K., Yao J.-M., Wang P., Feng Y., Niino Y., Bochenek C., Cruces M., Connor L., Jiang J.-A., Dai S., Luo R., Li G.-D., Miao C.-C., Niu J.-R., Anna-Thomas R., et al.
  • 雑誌名: Nature 巻: 606 号: 7916 ページ: 873-877
  • DOI: 10.1038/s41586-022-04755-5
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] Prospects of Searching for Type Ia Supernovae with 2.5-m Wide Field Survey Telescope (2022)
  • 著者名/発表者名: Hu Maokai, Hu Lei, Jiang Ji-an, Xiao Lin, Fan Lulu, Wei Junjie, Wu Xuefeng
  • 雑誌名: Universe 巻: 9 号: 1 ページ: 7-7
  • DOI: 10.3390/universe9010007
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] Deep Simultaneous Limits on Optical Emission from FRB 20190520B by 24.4 fps Observations with Tomo-e Gozen (2022)
  • 著者名/発表者名: Niino Yuu, Doi Mamoru, Sako Shigeyuki, Ohsawa Ryou, Arima Noriaki, Jiang Ji-an, Tominaga Nozomu, Tanaka Masaomi, Li Di, Niu Chen-Hui, Tsai Chao-Wei, Kobayashi Naoto, Takahashi Hidenori, Kondo Sohei, Mori Yuki, Aoki Tsutomu, Arimatsu Ko, Kasuga Toshihiro, Okumura Shin-ichiro
  • 雑誌名: The Astrophysical Journal 巻: 931 号: 2 ページ: 109-109
  • DOI: 10.3847/1538-4357/ac6be8
  • 査読あり / オープンアクセス / 国際共著
• [学会発表] Fast Transient Studies with Ongoing/Future Deep Imaging Surveys (2022)
  • 著者名/発表者名: Ji-an Jiang
  • 学会等名: Exploring the Transient Universe
  • 国際学会 / 招待講演
• [学会発表] From Subaru/HSC to WFST: The Past, Present, and Future for Fast Transient Studies (2022)
  • 著者名/発表者名: Ji-an Jiang
  • 学会等名: 1st Finland-Japan bilateral meeting on extragalactic transients
  • 招待講演
• [学会発表] Fast Transient Studies with Subaru/HSC Deep Imaging Surveys (2022)
  • 著者名/発表者名: Ji-an Jiang
  • 学会等名: NAOJ Seminar
  • 招待講演