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Electromagnetic counterparts modeling for binary neutron star mergers

Research Project

Project/Area Number 19K21044
Project/Area Number (Other) 18H05859 (2018)
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund (2019)
Single-year Grants (2018)
Review Section 0203:Particle-, nuclear-, astro-physics, and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Kawaguchi Kyohei  東京大学, 宇宙線研究所, 助教 (60822210)

Project Period (FY) 2018-08-24 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords重力波天文学 / 電磁波対応天体 / kilonova
Outline of Research at the Start

連星合体に付随する電磁波現象の中でもkilonovaという現象は、連星合体後の系の進化を反映するため、その光度曲線から強重力、高密度、強磁場、高温の極限環境における物理情報に迫れると期待されている。本研究ではkilonovaの光度曲線を方向依存性や多成分の放出物質の寄与を正確に考慮して予測できる計算コードを用い、放出物質の成分の質量、速度、密度分布を系統的に変えた輻射輸送計算を行うことで、それらに対するkilonova光度曲線の依存性を明らかにする。また、計算した結果をベースに機械学習によるフィッティングモデルを作成し、観測から系のパラメータを見積もる枠組みを構築することを目的とする。

Outline of Final Research Achievements

We investigate the kilonova lightcurves by systematically performing multi-wavelength radiative transfer simulations varying the mass, velocity, density structure, element abundance of the ejecta. In particular, we perform the simulations considering the various situations which can be realized in the neutron star binary mergers based on the recent numerical-relativity simulations, nucleosynthesis calculation, and atomic structure calculation for r-process elements. We applied the obtained lightcurve models to the recent observations of a gamma-ray-burst and gravitational wave event, and discussed the property of the central engines.

Academic Significance and Societal Importance of the Research Achievements

初の連星中性子星合体からの重力波イベントGW170817以降、多くの中性子星連星合体からの重力波イベント候補が報告されており、それらに伴うkilonovaフォローアップ観測も勢力的に行われている。そうした中kilonova光度曲線を輻射輸送計算によって系統的に調べ、その放出物質の質量や速度、形状、物質構成に対する依存性を明らかにする事は急務である。この研究において得られた光度曲線と放出物質の性質の間の系統的な理解、ならびにそのモデルの適用例は、観測されたkilonovaの光度曲線から放出物質の性質の情報にせまるための基礎となるものである。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research Report
  • Research Products

    (16 results)

All 2020 2019 Other

All Int'l Joint Research (2 results) Journal Article (4 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (10 results) (of which Int'l Joint Research: 5 results,  Invited: 7 results)

  • [Int'l Joint Research] Max Planck Institute (AEI) Potsdam(ドイツ)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Max Planck Institute (AEI) Potsdam(ドイツ)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Diversity of Kilonova Light Curves2020

    • Author(s)
      Kawaguchi, Shibata, M., Tanaka, M.
    • Journal Title

      The Astrophysical Journal

      Volume: 889 Issue: 2 Pages: 171-171

    • DOI

      10.3847/1538-4357/ab61f6

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] On the possibility of GW190425 being a black hole--neutron star binary merger2020

    • Author(s)
      Koutarou Kyutoku, Sho Fujibayashi, Kota Hayashi, Kyohei Kawaguchi, Kenta Kiuchi, Masaru Shibata, Masaomi Tanaka
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 890 Issue: 1 Pages: 4-4

    • DOI

      10.3847/2041-8213/ab6e70

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Constraint on the Ejecta Mass for Black Hole Neutron Star Merger Event Candidate S190814bv2020

    • Author(s)
      Kawaguchi Kyohei、Shibata Masaru、Tanaka Masaomi
    • Journal Title

      The Astrophysical Journal

      Volume: 893 Issue: 2 Pages: 153-153

    • DOI

      10.3847/1538-4357/ab8309

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Short GRB 160821B: a reverse shock, a refreshed shock, and a well-sampled kilonova2019

    • Author(s)
      Lamb, G. P., et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 883 Issue: 1 Pages: 48-48

    • DOI

      10.3847/1538-4357/ab38bb

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 輻射輸送計算に基づいたGW170817の放出物質のパラメータ推定2019

    • Author(s)
      Kawaguchi Kyohei、Shibata Masaru、Tanaka Masaomi
    • Organizer
      天文学会2019年春季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] キロノヴァの多様性と輻射輸送計算によるその光度曲線の予測2019

    • Author(s)
      Kawaguchi Kyohei、Shibata Masaru、Tanaka Masaomi
    • Organizer
      天文学会2019年秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 中性子星連星合体からの重力波と電磁波対応天体2019

    • Author(s)
      Kawaguchi Kyohei、Shibata Masaru、Tanaka Masaomi
    • Organizer
      熱場の量子論
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Gravitational waveform and electromagnetic counterparts modeling for binary neutron star mergers2019

    • Author(s)
      Kawaguchi Kyohei、Shibata Masaru、Tanaka Masaomi
    • Organizer
      KPS meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Diversity of kilonova lightcurves2019

    • Author(s)
      Kawaguchi Kyohei、Shibata Masaru、Tanaka Masaomi
    • Organizer
      Multi-Messenger Astrophysics in the Gravitational Wave Era
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] On possible diversity of kilonova lightcurves2019

    • Author(s)
      Kawaguchi Kyohei、Shibata Masaru、Tanaka Masaomi
    • Organizer
      Workshop to bring together experts on High Energy Astrophysics from Japan and Israel
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Gravitational-waves/Electromagnetic counterparts modeling for Neutron star binaries2019

    • Author(s)
      Kawaguchi Kyohei、Shibata Masaru、Tanaka Masaomi
    • Organizer
      Fifth KAGRA International Workshop in Perugia, Italy
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 輻射輸送計算に基づいた GW170817 の 放出物質のパラメータ推定2019

    • Author(s)
      川口恭平
    • Organizer
      日本天文学会2019年春季年会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Gravitational-waves/Electromagnetic counterparts modeling for Neutron star binaries2019

    • Author(s)
      Kyohei Kawaguchi
    • Organizer
      Fifth KAGRA International Workshop in Perugia, Italy
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Gravitational waveform and electromagnetic counterparts modeling for binary neutron star mergers2019

    • Author(s)
      Kyohei Kawaguchi
    • Organizer
      KPS 2019 Spring Meeting
    • Related Report
      2018 Annual Research Report
    • Invited

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Published: 2018-08-27   Modified: 2024-03-26  

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