2019 Fiscal Year Annual Research Report
エディントン光度を超える降着型コンパクト天体の系統的研究
| Project/Area Number |
18F18318
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| Research Institution | Kyoto University |
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Principal Investigator |
上田 佳宏 京都大学, 理学研究科, 准教授 (10290876)
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| Co-Investigator(Kenkyū-buntansha) |
HU CHIN-PING 京都大学, 理学(系)研究科(研究院), 外国人特別研究員
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| Project Period (FY) |
2018-11-09 – 2021-03-31
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| Keywords | 中性子星 / 超臨界降着 |
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| Outline of Annual Research Achievements |
During the last FY, Dr. Hu published three first-author journal papers, three collaborating papers, and two non-refereed publications. We have finished studies in the pulse profile of magnetars to infer the surface temperature distribution, and the pilot study of a super-critical accreting source SMC X-1 to reveal the spin-superorbital connection in this extreme system. In searching for pulsation and orbital modulation in extragalactic sources, we have developed a GPU-based algorithm. The first trial run has found dips in M51 ULX-7, which is the first dipping pulsating ultraluminous X-ray source (ULXs). We are now drafting the paper and will submit it to Nature Astronomy soon. We joined collaborations in studying the X-ray spectroscopy of the most extreme ULX, the timing property of a gamma-ray pulsar, and an X-ray emitting contact binary.
Dr. Hu attended two conferences and gave oral presentations, and was invited to give colloquiums in three institutes. He presented his study in SMC X-1 in the ASROC meeting in Taiwan, and in "The Future of X-ray Timing" in the Netherlands. Except for the high-energy astrophysics, he developed a few time-frequency analysis tools that are successfully used in analyzing gravitational wave data. Dr. Hu presented corresponding studies in two institutes in Taiwan.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
Currently, we have several ongoing projects and three of them have interesting results and will be submitted soon. Dr. Hu also participated in a CubeSat project and a gravitational wave study project. These greatly expand his research field from high-energy astrophysics to instrumentation and gravitational-wave physics.
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| Strategy for Future Research Activity |
We will submit a few papers recently. The first one is the discovery of dips of M51 ULX-7. We have submitted a pre-submission inquiry to Nature Astronomy and got invited to submit the full manuscript. The data analysis part of the multi-wavelength study (led by T. Enoto) of the giant radio pulse has been finished. We are going to submit it to Science. Dr. Hu is now leading a NICER team paper of the recently discovered magnetar Swift J1818.0-1607, and he plans to submit it to the Astrophysical Journal in a few weeks.
Besides M51 ULX-7, we also found another eclipsing binary in the same galaxy. We will summarize it and submit after the current three papers. The GPU-based algorithm will be applied to more galaxies to search for interesting sources.
For the gravitational-wave physics, Dr. Hu has analyzed the LIGO O1/O2 data and will lead a collaboration paper between Japan, Taiwan, and Korea. Furthermore, he will collaborate with theoretical astronomers working on the gravitational wave signal from core-collapse supernovae.
For the X-ray CubeSat, Dr. Hu leads the science team of the NinjaSat project (PI: T. Enoto). He has worked on simulations to test the feasibility of NinjaSat. He will use it to track continuous gravitational wave sources and the quasi-periodic oscillation signals from active galactic nuclei.
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[Journal Article] Repeated state change of variable gamma-ray pulsar, PSR J2021+40262020
Author(s)
Takata, J., Wang, H. H., Lin, L. C. C., Hu, C.-P., Hui, C. Y., et al.
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Journal Title
The Astrophysical Journal
Volume: 890
Pages: -
DOI
Peer Reviewed / Int'l Joint Research
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[Journal Article] Investigation of X-ray timing and spectral properties of ESO 243-49 HLX-1 with long-term Swift Monitoring2020
Author(s)
Lin, L. C. C., Hu, C.-P., Li, K. L., Takata, J., Yen, D. C.-C., et al.
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Journal Title
Monthly Notices of the Royal Astronomical Society
Volume: 491
Pages: 5682-5692
DOI
Peer Reviewed / Int'l Joint Research
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[Journal Article] An optical and X-ray study of the contact binary, BH Cassiopeia2019
Author(s)
Liu, J., Esamdin, A., Zhang, Y., Hu, C.-P., Chen, T., et al.
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Journal Title
Publications of the Astronomical Society of the Pacific
Volume: 101
Pages: -
DOI
Peer Reviewed / Int'l Joint Research
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