Dynamical tides in massive star binaries

• Project Area: Gravitational wave physics and astronomy: Genesis
• Project/Area Number: 18H04573
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Research Institution: The University of Tokyo
• Principal Investigator: 樫山 和己 東京大学, 大学院理学系研究科(理学部), 助教 (10785744)
• Project Period (FY): 2018-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: ブラックホール / 超新星爆発 / 重力波天文学 / 大質量星 / 大質量星の進化 / 大質量連星 / 潮汐相互作用 / 重力波

Outline of Annual Research Achievements

2019年度は主に、1. 大質量星が重力崩壊を起こす直前の質量放出と重力崩壊時の爆発エジェクタの相互作用の理論計算を行い、特に重力崩壊に伴ってブラックホールが形成される場合に付随する突発天体現象とその検出可能性を議論した。また、2. 連星白色矮星合体の結果形成される強磁場高速回転合体残骸からの磁気遠心力駆動風の理論モデルを確立した。

1.に関してはTsuna et al. 2019において重力崩壊直前の質量放出と重力崩壊じの爆発エジェクタが衝突した結果形成される衝撃波のダイナミクスを自己相似解を用いて記述、衝撃波圧縮を受けたガスからの輻射輸送を解いて、発生するUV/可視光/近赤外のライトカーブを計算する方法を確立した。特に、所謂forward shockとreverse shock両方の寄与を無矛盾に取り入れることに世界で初めて成功した。

2.に関してはKashiyama et al. 2019において、2019年4月に発見が報告された白色矮星J005311 WDが放出する光速の10%もの速度をもつ星風に注目、強磁場高速回転白色矮星からの磁気遠心力駆動風の理論計算を行った。その結果、J005311は質量がおよそ1.2太陽質量、磁場強度がおよそ10^9 G、回転速度がおよそ10秒であることを明らかにした。このようなパラメータは連星白色矮星合体の結果形成される強磁場高速回転白色矮星の合体後数1000年の性質に符合し、J005311がこのような天体の第一例目であることを強く示唆している。

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] カリフォルニア工科大学/ペンシルバニア州立大学(米国)
• [Int'l Joint Research] University of California, Berkeley/Pennsylvania State University/Princeton University(米国)
• [Journal Article] Dust formation in embryonic pulsar-aided supernova remnants (2019)
  • Author(s): Omand Conor M B、Kashiyama Kazumi、Murase Kohta
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 484 Issue: 4 Pages: 5468-5483
  • DOI: 10.1093/mnras/stz371
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Type IIn Supernova Light Curves Powered by Forward and Reverse Shocks (2019)
  • Author(s): Tsuna Daichi、Kashiyama Kazumi、Shigeyama Toshikazu
  • Journal Title: The Astrophysical Journal Volume: 884 Issue: 1 Pages: 87-87
  • DOI: 10.3847/1538-4357/ab40ba
  • Peer Reviewed
• [Journal Article] A Search for Late-time Radio Emission and Fast Radio Bursts from Superluminous Supernovae (2019)
  • Author(s): Law C. J.、Omand C. M. B.、Kashiyama K.、Murase K.、Bower G. C.、Aggarwal K.、Burke-Spolaor S.、Butler B. J.、Demorest P.、Lazio T. J. W.、Linford J.、Tendulkar S. P.、Rupen M. P.
  • Journal Title: The Astrophysical Journal Volume: 886 Issue: 1 Pages: 24-24
  • DOI: 10.3847/1538-4357/ab4adb
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The Optically Thick Rotating Magnetic Wind from a Massive White Dwarf Merger Product (2019)
  • Author(s): Kashiyama Kazumi、Fujisawa Kotaro、Shigeyama Toshikazu
  • Journal Title: The Astrophysical Journal Volume: 887 Issue: 1 Pages: 39-39
  • DOI: 10.3847/1538-4357/ab4e97
  • Peer Reviewed
• [Journal Article] Scattered Short Gamma-Ray Bursts as Electromagnetic Counterparts to Gravitational Waves and Implications of GW170817 and GRB 170817A (2018)
  • Author(s): Kisaka Shota、Ioka Kunihito、Kashiyama Kazumi、Nakamura Takashi
  • Journal Title: The Astrophysical Journal Volume: 867 Issue: 1 Pages: 39-39
  • DOI: 10.3847/1538-4357/aae30a
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Mass Ejection in Failed Supernovae: Variation with Stellar Progenitor (2018)
  • Author(s): Fernandez Rodrigo、Quataert Eliot、Kashiyama Kazumi、Coughlin Eric R
  • Journal Title: Monthly Notice Royal Astronomy Society Volume: 476 Issue: 2 Pages: 2366-2383
  • DOI: 10.1093/mnras/sty306
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Repulsion of fallback matter due to central energy source in supernova (2018)
  • Author(s): Shigeyama Toshikazu、Kashiyama Kazumi
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Issue: 6 Pages: 1-11
  • DOI: 10.1093/pasj/psy108
  • Peer Reviewed / Open Access
• [Journal Article] Constraining very-high-energy and optical emission from FRB 121102 with the MAGIC telescopes (2018)
  • Author(s): MAGIC Collaboration、Acciari V A、Hassan T、Hoang J、Inoue S、Marcote B et al.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 481 Issue: 2 Pages: 2479-2486
  • DOI: 10.1093/mnras/sty2422
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Radio transients from newborn black holes (2018)
  • Author(s): Kashiyama Kazumi、Hotokezaka Kenta、Murase Kohta
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 478 Issue: 2 Pages: 2281-2290
  • DOI: 10.1093/mnras/sty1145
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Detectability of thermal neutrinos from binary neutron-star mergers and implications for neutrino physics (2018)
  • Author(s): Kyutoku Koutarou、Kashiyama Kazumi
  • Journal Title: Physical Review D Volume: 97 Issue: 10 Pages: 1-12
  • DOI: 10.1103/physrevd.97.103001
  • Peer Reviewed / Open Access
• [Presentation] Optically thick rotating magnetic wind from a massive white-dwarf merger product (2019)
  • Author(s): Kazumi Kashiyama
  • Organizer: High Energy Astrophysics Japan Israel Workshop
  • Int'l Joint Research / Invited
• [Presentation] White dwarf merger remnants and fast radio bursts (2019)
  • Author(s): Kazumi Kashiyama
  • Organizer: YITP long-term workshop: Multi-Messenger Astrophysics in the Gravitational Wave Era
  • Int'l Joint Research / Invited
• [Presentation] Searching for the origin of fast radio bursts (2019)
  • Author(s): 樫山和己
  • Organizer: 高エネルギー突発現象の多波長・多粒子観測と理論
  • Invited
• [Presentation] The birth and growth of supermassive black holes in the early universe (2019)
  • Author(s): Kazumi Kashiyama
  • Organizer: Space Gravitational Wave Detection
  • Int'l Joint Research / Invited
• [Presentation] Detectability of Small-Scale Dark Matter Clumps with Pulsar Timing Arrays (2019)
  • Author(s): Kazumi Kashiyama
  • Organizer: JSPS-FAPESP workshop on Dark Energy, Dark Matter, and Galaxies
  • Int'l Joint Research / Invited
• [Presentation] Ultra-Long Gamma-Ray Bursts and Tidal Disruption Events from Intermediate-Mass Black Holes in Collapsing Star Clusters (2018)
  • Author(s): Kazumi Kashiyama
  • Organizer: Taiwanese Theoretical Astrophysics Workshop
  • Int'l Joint Research / Invited
• [Presentation] Ultra-long GRBs and TDEs from Newborn IMBHs in Collapsing Star Cluster (2018)
  • Author(s): 樫山和己
  • Organizer: 日本天文学会
• [Presentation] Electromagnetic counterparts of massive black hole formation (2018)
  • Author(s): Kazumi Kashiyama
  • Organizer: 新学術領域(重力波物理学・天文学:創世記)シンホジウム
• [Presentation] Multi-messenger astronomy with DECIGO? (2018)
  • Author(s): 樫山和己
  • Organizer: 第17回DECIGOワークショッフ
  • Invited
• [Presentation] Missing links of high energy astrophysics (2018)
  • Author(s): 樫山和己
  • Organizer: 理論懇シンポジウム2018
  • Invited
• [Book] 謎の天体Fast Radio Burstは若い中性子星が起源か？ (2019)
  • Author(s): 樫山和己
  • Total Pages: 6
  • Publisher: 日本物理学会誌