Interaction and radiation in very high energy binaries

• Project/Area Number: 24540235
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: Hokkai-Gakuen University
• Principal Investigator: OKAZAKI ATSUO 北海学園大学, 工学部, 教授 (00185414)
• Co-Investigator(Kenkyū-buntansha): NAITO Tsuguya 山梨学院大学, 経営情報学部, 教授 (50319084) ; KAWACHI Akiko 東海大学, 理学部, 教授 (70332591)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 宇宙物理 / X線天文学 / ガンマ線天文学 / 恒星物理学 / 高密度天体

Outline of Final Research Achievements

Based on 3D hydrodynamic simulations of individual VHE (very high energy) gamma-ray binaries, we have calculated high-energy emission from shocked regions and compared the resulting time-dependent model flux with observed X-ray light curves, in order to clarify the details of the interaction and the nature of the compact object. We have also proposed a new scenario for X-ray outbursts in Be/X-ray binaries, potential candidates for VHE gamma-ray binaries, based on 3D hydrodynamic simulations of these systems.

Research Products

• [Journal Article] Probing the Nature of the TeV γ-Ray Binary HESS J0632+057 by Monitoring Be Disk Variability (2015)
  • Author(s): Moritani, Y., Okazaki, A. T., Carciofi, A. C., Imada, A., Akitaya, H., Ebisuda, N., Itoh, R., Kawaguchi, K., Mori, K., Takaki, K., Ueno, I., Ui, T.
  • Journal Title: The Astrophysical Journal Letters Volume: 804 Issue: 2 Pages: 1-6
  • DOI: 10.1088/2041-8205/804/2/l32
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 2.5D global-disk oscillation models of the Be shell star ζ Tauri. I. Spectroscopic and polarimetric analysis (2015)
  • Author(s): Escolano, C., Carciofi, A. C., Okazaki, A. T., Rivinius, T., Baade, D., Štefl, S.
  • Journal Title: Astronomy & Astrophysics Volume: 576 Pages: 1-15
  • DOI: 10.1051/0004-6361/201425446
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] High-energy Observations of PSR B1259-63/LS 2883 through the 2014 Periastron Passage: Connecting X-Rays to the GeV Flare (2015)
  • Author(s): Tam, P. H. T., Li, K. L., Takata, J., Okazaki, A. T., Hui, C. Y., Kong, A. K. H.
  • Journal Title: The Astrophysical Journal Letters Volume: 798 Issue: 1 Pages: 1-6
  • DOI: 10.1088/2041-8205/798/1/l26
  • Peer Reviewed
• [Journal Article] Radiation-driven Warping of Circumbinary Disks around Eccentric Young Star Binaries (2014)
  • Author(s): Hayasaki, Kimitake, Sohn, Bong Won, Okazaki, Atsuo T., Jung, Taehyun, Zhao, Guangyao, Naito, Tsuguya
  • Journal Title: The Astrophysical Journal Volume: 797 Issue: 1 Pages: 1-9
  • DOI: 10.1088/0004-637x/797/1/68
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Sudden End of X-Ray Outbursts around Periastron of Circinus X-1 Observed with MAXI (2014)
  • Author(s): Asai, Kazumi; Mihara, Tatehiro; Matsuoka, Masaru; Sugizaki, Mutsumi; Nakahira, Satoshi; Negoro, Hitoshi; Nakajima, Motoki; Okazaki, Atsuo T.
  • Journal Title: PASJ Volume: 66 Issue: 4 Pages: 1-13
  • DOI: 10.1093/pasj/psu054
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Warped Circumbinary Disks in Active Galactic Nuclei (2014)
  • Author(s): Hayasaki, Kimitake, Sohn, Bong Won, Okazaki, Atsuo T., Jung, Taehyun, Zhao, Guangyao, Naito, Tsuguya
  • Journal Title: The Astrophysical Journal Volume: 790 Issue: 1 Pages: 1-9
  • DOI: 10.1088/0004-637x/790/1/62
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Precessing Warped Be Disk Triggering the Giant Outbursts in 2009 and 2011 in A0535+262/V725Tau (2013)
  • Author(s): Y. Moritani, D. Nogami, A. T. Okazaki, A. Imada, E. Kambe, S. Honda, 0. Hashimoto, S. Mizoguchi, Y. Kanda, K. Sadakane. K. Ichikawa
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 65 Issue: 4 Pages: 1-25
  • DOI: 10.1093/pasj/65.4.83
  • Peer Reviewed
• [Journal Article] Constraints on decreases in η Carinae's mass-loss from 3D hydrodynamic simulations of its binary colliding winds (2013)
  • Author(s): Madura, T. I.; Gull, T. R.; Okazaki, A. T.; Russell, C. M. P.; Owocki, S. P.; Groh, J. H.; Corcoran, M. F.; Hamaguchi, K.; Teodoro, M.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 436 Issue: 4 Pages: 3820-3855
  • DOI: 10.1093/mnras/stt1871
  • Peer Reviewed
• [Journal Article] Origin of Two Types of X-Ray Outbursts in Be/X-Ray Binaries. I. Accretion Scenarios (2013)
  • Author(s): Okazaki, A. T.; Hayasaki, K.; Moritani, Y.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 65 Pages: 41-41
  • Peer Reviewed
• [Journal Article] Modeling high-energy light curves of the PSR B1259-63/LS 2883 binary based on 3D SPH simulation (2012)
  • Author(s): 高田順平, 他
  • Journal Title: Astrophysical Journal Volume: 750 Issue: 1 Pages: 70-79
  • DOI: 10.1088/0004-637x/750/1/70
  • Peer Reviewed
• [Presentation] Flip-flopping pulsar model for the gamma-ray binary HESS J0632+057 (2015)
  • Author(s): Okazaki, Atsuo T.
  • Organizer: Variable Galactic Gamma-ray Sources III
  • Place of Presentation: Heidelberg, Germany
  • Year and Date: 2015-05-04 – 2015-05-06
• [Presentation] Dynamical Modeling of the Be/BH Binary AGL J2241+4454 (2015)
  • Author(s): 岡崎敦男
  • Organizer: 日本天文学会
  • Place of Presentation: 大阪大学（豊中市）
  • Year and Date: 2015-03-18 – 2015-03-21
• [Presentation] Quasi-cyclic variabil- ity of circumstellar disks around Oe/Be stars (2014)
  • Author(s): Okazaki, Atsuo T.
  • Organizer: Magnetism and Variability in O Stars
  • Place of Presentation: Amsterdam, The Netherland
  • Year and Date: 2014-09-17 – 2014-09-19
• [Presentation] Change of pulsar state in the gamma-ray binary HESS J0632+057 (2014)
  • Author(s): 岡崎敦男
  • Organizer: 日本天文学会
  • Place of Presentation: 山形大学（山形市）
  • Year and Date: 2014-09-11 – 2014-09-13
• [Presentation] Current status of our un- derstanding of Be disk physics (2014)
  • Author(s): Okazaki, Atsuo T.
  • Organizer: Bright Emissaries: Be Stars as Messengers as Sta- Disk Physics
  • Place of Presentation: London, Canada
  • Year and Date: 2014-08-11 – 2014-08-13
  • Invited
• [Presentation] Dynamical modeling of the Be/Gamma-ray sources HESS J0632+057 and AGL J2241+4454 (2014)
  • Author(s): Okazaki, Atsuo T.
  • Organizer: Be/X-ray Binary Workshop 2014
  • Place of Presentation: Valencia, Spain
  • Year and Date: 2014-07-07 – 2014-07-10
• [Presentation] 3D Dynamical Modeling of Wind Accretion in Cyg X-3 (2014)
  • Author(s): Atsuo Okazaki
  • Organizer: Suzaku-MAXI 2014 "Expanding the Frontiers of the X-ray Universe"
  • Place of Presentation: Ehime University (Ehime)
• [Presentation] Cyclic X-ray Activity in Be/X-ray Binaries in the Context of Decretion Disk Evolution (2013)
  • Author(s): 岡崎敦男
  • Organizer: 日本天文学会2013年春季年会
  • Place of Presentation: 埼玉県さいたま市
• [Presentation] Optical line variability as a probe of the nature of gamma-ray binaries (2013)
  • Author(s): Okazaki, Atsuo T.
  • Organizer: Variable Galactic Gamma-Ray Sources
  • Place of Presentation: Barcelona, Spain
  • Invited
• [Presentation] Massive Binaries as VHE Gamma-ray Sources (2013)
  • Author(s): Okazaki, Atsuo T.
  • Organizer: Massive Stars: From alpha to Omega
  • Place of Presentation: Rhodes, Greece
• [Presentation] Accretion in High Mass X-ray Binaries (2012)
  • Author(s): Okazaki, Atsuo T.
  • Organizer: 39th COSPAR Scientific Assembly
  • Place of Presentation: Mysore, India
  • Invited
• [Presentation] Massive Binaries as VHE Gamma-ray Sources
  • Author(s): Atsuo Okazaki
  • Organizer: Massive Stars-From α to Ω
  • Place of Presentation: Rhodes, Greece
• [Presentation] Thermal X-ray Emission from Stellar Wind Shocks in the VHE Gamma-ray Binary LS 5039
  • Author(s): 岡崎敦男
  • Organizer: 日本天文学会
  • Place of Presentation: 東北大学（仙台市）
• [Presentation] Interaction between a Pulsar Wind and a Be Star in the Gamma-ray Binary HESS J0632+057
  • Author(s): 岡崎敦男
  • Organizer: 日本天文学会
  • Place of Presentation: 国際基督教大学（三鷹市）