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
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 外国
• Review Section: Basic Section 16010:Astronomy-related
• Research Institution: Kyoto University
• Principal Investigator: 上田 佳宏 京都大学, 理学研究科, 准教授 (10290876)
• 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
• Project Period (FY): 2018-11-09 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥2,200,000 (Direct Cost: ¥2,200,000); Fiscal Year 2020: ¥600,000 (Direct Cost: ¥600,000); Fiscal Year 2019: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2018: ¥500,000 (Direct Cost: ¥500,000)
• Keywords: 中性子星 / 超臨界降着

Outline of Annual Research Achievements

During the last fiscal year, Dr. Hu participated in the NICER Magnetar and Magnetosphere group and contributed to several works, including the discovery of a new radio-emitting magnetar, Swift J1818.0-1627, which hints at an important link between magnetars and high-magnetic-field rotation-powered pulsar. Follow-up observations using radio telescopes are ongoing. As for the accreting compact objects, Drs. Hu and Ueda have discovered periodic dips in a pulsating ULX, M51 ULX-7. This unique property among pulsating ULXs implies a high inclination angle that disfavors the strong-beaming scenario. The result provides an important hint for magnetospheric accretion and suggests a high magnetic field of ULX-7. Moreover, a few interesting sources are discovered by the semi-automatic timing algorithm developed during Dr. Hu's JSPS tenure. They will be deeply investigated in the future.

Research Progress Status

令和2年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和2年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Possible Periodic Dips in the Pulsating Ultraluminous X-Ray Source M51 ULX-7 (2021)
  • Author(s): Hu, C.-P., Ueda, Y., and Enoto, T.
  • Journal Title: The Astrophysical Journal Volume: 909 Issue: 1 Pages: 5-5
  • DOI: 10.3847/1538-4357/abd7a5
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A Multiwavelength Study of the γ-Ray Binary Candidate HESS J1832-093 (2020)
  • Author(s): Tam, P.-H. T., (Hu, C.-P.) et al.
  • Journal Title: The Astrophysical Journal Volume: 899 Issue: 1 Pages: 75-75
  • DOI: 10.3847/1538-4357/ab9e76
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A Multiwavelength Study of PSR J1119-6127 after 2016 Outburst (2020)
  • Author(s): Wang, H.-H., (Hu, C.-P.) et al.
  • Journal Title: The Astrophysical Journal Volume: 902 Issue: 2 Pages: 96-96
  • DOI: 10.3847/1538-4357/abb3c4
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] NICER Observation of the Temporal and Spectral Evolution of Swift J1818.0－1607: A Missing Link between Magnetars and Rotation-powered Pulsars (2020)
  • Author(s): Hu, C.-P., et al.
  • Journal Title: The Astrophysical Journal Volume: 902 Issue: 1 Pages: 1-1
  • DOI: 10.3847/1538-4357/abb3c9
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Repeated state change of variable gamma-ray pulsar, PSR J2021+4026 (2020)
  • Author(s): Takata, J., Wang, H. H., Lin, L. C. C., Hu, C.-P., Hui, C. Y., et al.
  • Journal Title: The Astrophysical Journal Volume: 890 Issue: 1 Pages: 16-16
  • DOI: 10.3847/1538-4357/ab67b1
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Investigation of X-ray timing and spectral properties of ESO 243-49 HLX-1 with long-term Swift Monitoring (2020)
  • Author(s): Lin, L. C. C., Hu, C.-P., Li, K. L., Takata, J., Yen, D. C.-C., et al.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 491 Issue: 4 Pages: 5682-5692
  • DOI: 10.1093/mnras/stz3372
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Monitoring the Superorbital Period Variation and Spin Period Evolution of SMC X-1 (2019)
  • Author(s): Hu, C.-P., Mihara, T., Sugizaki, M., Ueda, Y., and Enoto, T.
  • Journal Title: The Astrophysical Journal Volume: 885 Issue: 2 Pages: 123-123
  • DOI: 10.3847/1538-4357/ab48e4
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] An optical and X-ray study of the contact binary, BH Cassiopeia (2019)
  • Author(s): Liu, J., Esamdin, A., Zhang, Y., Hu, C.-P., Chen, T., et al.
  • Journal Title: Publications of the Astronomical Society of the Pacific Volume: 101 Issue: 1002 Pages: 084202-084202
  • DOI: 10.1088/1538-3873/ab247a
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A systematic study of soft X-ray pulse profiles of magnetars in quiescence (2019)
  • Author(s): Hu, Chin-Ping, Ng, C.-Y., and Ho, W. C. G.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 485 Issue: 3 Pages: 4274-4286
  • DOI: 10.1093/mnras/stz513
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] On the Connection between Radiative Outbursts and Timing Irregularities in Magnetars (2019)
  • Author(s): Hu, Chin-Ping and Ng, C.-Y.
  • Journal Title: Astronomische Nachrichten Volume: - Issue: 4 Pages: 340-345
  • DOI: 10.1002/asna.201913621
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Tracking the Superorbital Period Excursionand the Spin Period Evolution of SMC X-1 (2019)
  • Author(s): Hu, C.-P. et al.
  • Organizer: The Future of X-ray Timing
  • Int'l Joint Research
• [Presentation] On the Connection between Spin Period Evolution and Superorbital Period Excursion of SMC X-1 (2019)
  • Author(s): Hu, C.-P. et al.
  • Organizer: 2019 ASROC Annual Meeting
  • Int'l Joint Research
• [Presentation] Tracking the Spin Period Evolution of Accretion-Powered Pulsars (2019)
  • Author(s): Hu, Chin-Ping
  • Organizer: 中性子星の観測と理論
  • Invited