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Understanding supernova gravitational waves and establishing protoneutron star asteroseismology

Research Project

Project/Area Number 19KK0354
Research Category

Fund for the Promotion of Joint International Research (Fostering Joint International Research (A))

Allocation TypeMulti-year Fund
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionInstitute of Physical and Chemical Research (2020-2023)
National Astronomical Observatory of Japan (2019)

Principal Investigator

Sotani Hajime  国立研究開発法人理化学研究所, 開拓研究本部, 研究員 (70386720)

Project Period (FY) 2020 – 2023
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000)
Keywords中性子星 / 超新星爆発 / 重力波 / 星震学 / 状態方程式 / 宇宙物理
Outline of Research at the Start

重力波の直接観測の成功を受け、今後は観測された重力波から背後の物理を抽出することが重要となる。そのためには、直接的な数値シミュレーションだけでなく、摂動的なアプローチである星震学が非常に強力な方法となる。本研究では、未だ直接観測がなされていない超新星爆発からの重力波に着目し、原始中性子星における星震学の確立を目指す。そこで、世界的な数値シミュレーションの専門家である日本国内の研究者に、応募者を含む星震学の専門家である海外共同研究者を迎えることで、日本国内での共同研究では成し得ない大いなる発展を期待する。

Outline of Final Research Achievements

Supernova explosions are the second most expected source of gravitational waves after compact binary mergers. Up to now, the existence of gravitational wave signals is found via numerical simulations, but their physical background has not been well understood. Through linear analysis of proto-neutron stars produced after supernova explosions, we showed that the origin of supernova gravitational waves is gravitational waves associated with the fundamental oscillations of proto-neutron stars. We also found that the supernova gravitational wave frequency can be universally expressed in terms of the average density of proto-neutron stars, independent of supernova models such as the equation of state and the progenitor mass.

Academic Significance and Societal Importance of the Research Achievements

超新星爆発後に生じる原始中性子星は、地上では実現困難な極限的な環境となっている。そのため、原始中性子星の物理を知ることは、極限的な環境下における物理の片鱗を掴むことになる。重力波源として有望な超新星爆発からの重力波に関わる物理を理解することで、将来、重力波が観測された際に逆問題として原始中性子星の物理量を引き出せるかもしれない。この結果、超高密度領域における物理にこれまでにない制限を与えることができると期待される。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (43 results)

All 2024 2023 2022 2021 2020

All Int'l Joint Research (2 results) Journal Article (22 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 22 results,  Open Access: 4 results) Presentation (19 results) (of which Int'l Joint Research: 12 results,  Invited: 1 results)

  • [Int'l Joint Research] ジョンズ・ホプキンズ大学(米国)2023

    • Year and Date
      2023-05-07
    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] テュービンゲン大学(ドイツ)2022

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Shear oscillations in neutron stars and the nuclear symmetry energy2024

    • Author(s)
      Sotani Hajime
    • Journal Title

      Physical Review D

      Volume: 109 Issue: 2

    • DOI

      10.1103/physrevd.109.023030

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Shear and interface modes in neutron stars with pasta structures2023

    • Author(s)
      Sotani Hajime
    • Journal Title

      Physical Review D

      Volume: 107 Issue: 12

    • DOI

      10.1103/physrevd.107.123025

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Neutron star mass-radius constraints using the high-frequency quasi-periodic oscillations of GRB 200415A2023

    • Author(s)
      Sotani H.、Kokkotas K. D.、Stergioulas N.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 676 Pages: A65-A65

    • DOI

      10.1051/0004-6361/202346360

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Universality in quasinormal modes of neutron stars with quark-hadron crossover2023

    • Author(s)
      Sotani Hajime、Kojo Toru
    • Journal Title

      Physical Review D

      Volume: 108 Issue: 6 Pages: 1-9

    • DOI

      10.1103/physrevd.108.063004

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Empirical neutron star mass formula based on experimental observables2023

    • Author(s)
      Hajime Sotani and Tomoya Naito
    • Journal Title

      Physical Review C

      Volume: 107 Issue: 3 Pages: 035802-035802

    • DOI

      10.1103/physrevc.107.035802

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] New constraints on the neutron-star mass and radius relation from terrestrial nuclear experiments2022

    • Author(s)
      Sotani Hajime、Nishimura Nobuya、Naito Tomoya
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2022 Issue: 4

    • DOI

      10.1093/ptep/ptac055

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Accuracy of one-dimensional approximation in neutron star quasi-normal modes2022

    • Author(s)
      Sotani Hajime
    • Journal Title

      The European Physical Journal C

      Volume: 82 Issue: 5

    • DOI

      10.1140/epjc/s10052-022-10439-1

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Impacts of the Direct Urca and Superfluidity inside a Neutron Star on Type I X-Ray Bursts and X-Ray Superbursts2022

    • Author(s)
      Dohi A.、Nishimura N.、Sotani H.、Noda T.、Liu He-Lei、Nagataki S.、Hashimoto M.
    • Journal Title

      The Astrophysical Journal

      Volume: 937 Issue: 2 Pages: 124-124

    • DOI

      10.3847/1538-4357/ac8dfe

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Effects of finite sizes of atomic nuclei on shear modulus and torsional oscillations in neutron stars2022

    • Author(s)
      Sotani Hajime、Togashi Hajime、Takano Masatoshi
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 516 Issue: 4 Pages: 5440-5445

    • DOI

      10.1093/mnras/stac2615

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Merger and Postmerger of Binary Neutron Stars with a Quark-Hadron Crossover Equation of State2022

    • Author(s)
      Huang Yong-Jia、Baiotti Luca、Kojo Toru、Takami Kentaro、Sotani Hajime、Togashi Hajime、Hatsuda Tetsuo、Nagataki Shigehiro、Fan Yi-Zhong
    • Journal Title

      Physical Review Letters

      Volume: 129 Issue: 18 Pages: 181101-181101

    • DOI

      10.1103/physrevlett.129.181101

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Neutron star mass formula with nuclear saturation parameters for asymmetric nuclear matter2022

    • Author(s)
      Sotani Hajime、Ota Shinsuke
    • Journal Title

      Physical Review D

      Volume: 106 Issue: 10

    • DOI

      10.1103/physrevd.106.103005

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Gravitational wave asteroseismology on cooling neutron stars2022

    • Author(s)
      Sotani Hajime、Dohi Akira
    • Journal Title

      Physical Review D

      Volume: 105 Issue: 2

    • DOI

      10.1103/physrevd.105.023007

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Neutron star mass formula with nuclear saturation parameters2022

    • Author(s)
      Sotani Hajime、Togashi Hajime
    • Journal Title

      Physical Review D

      Volume: 105 Issue: 6

    • DOI

      10.1103/physrevd.105.063010

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Neutron star asteroseismology and nuclear saturation parameter2021

    • Author(s)
      Sotani Hajime
    • Journal Title

      Physical Review D

      Volume: 103 Issue: 12

    • DOI

      10.1103/physrevd.103.123015

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Stability of the protoneutron stars towards black hole formation2021

    • Author(s)
      Sotani Hajime、Sumiyoshi Kohsuke
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 507 Issue: 2 Pages: 2766-2776

    • DOI

      10.1093/mnras/stab2301

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Universal relation for supernova gravitational waves2021

    • Author(s)
      Sotani Hajime、Takiwaki Tomoya、Togashi Hajime
    • Journal Title

      Physical Review D

      Volume: 104 Issue: 12 Pages: 123009-123009

    • DOI

      10.1103/physrevd.104.123009

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Universal relations between the quasinormal modes of neutron star and tidal deformability2021

    • Author(s)
      Sotani Hajime、Kumar Bharat
    • Journal Title

      Physical Review D

      Volume: 104 Issue: 12

    • DOI

      10.1103/physrevd.104.123002

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Dimension dependence of numerical simulations on gravitational waves from protoneutron stars2020

    • Author(s)
      Sotani Hajime、Takiwaki Tomoya
    • Journal Title

      Physical Review D

      Volume: 102 Issue: 2

    • DOI

      10.1103/physrevd.102.023028

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Avoided crossing in gravitational wave spectra from protoneutron star2020

    • Author(s)
      Sotani Hajime、Takiwaki Tomoya
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 498 Issue: 3 Pages: 3503-3512

    • DOI

      10.1093/mnras/staa2597

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Gravitational wave asteroseismology for low-mass neutron stars2020

    • Author(s)
      Sotani Hajime
    • Journal Title

      Physical Review D

      Volume: 102 Issue: 6

    • DOI

      10.1103/physrevd.102.063023

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Accuracy of the relativistic Cowling approximation in protoneutron star asteroseismology2020

    • Author(s)
      Sotani Hajime、Takiwaki Tomoya
    • Journal Title

      Physical Review D

      Volume: 102 Issue: 6

    • DOI

      10.1103/physrevd.102.063025

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Estimating the nuclear saturation parameter via low-mass neutron star asteroseismology2020

    • Author(s)
      Sotani Hajime
    • Journal Title

      Physical Review D

      Volume: 102 Issue: 10

    • DOI

      10.1103/physrevd.102.103021

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] 超新星重力波における原始中性子星の普遍的な物理量2024

    • Author(s)
      祖谷元
    • Organizer
      日本物理学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] SN GWs and asteroseismology2023

    • Author(s)
      Hajime Sotani
    • Organizer
      LIGO-Virgo-KAGRA collaboration meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Neutron star mass and radius constraints using the high-frequency QPOs of GRB 200415A2023

    • Author(s)
      Hajime Sotani
    • Organizer
      4th Quarks and Compact Stars workshop (QCS2023)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Constraint on the mass and radius of GRB 200415A using the high-frequency QPOs2023

    • Author(s)
      Hajime Sotani
    • Organizer
      Hawaii 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Asteroseismology of Neutron Stars2023

    • Author(s)
      Hajime Sotani
    • Organizer
      Joint RIKEN/N3AS Workshop on Multi-Messenger Astrophysics
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] クラスト振動によるGRB 200415Aの質量半径の制限2023

    • Author(s)
      祖谷元
    • Organizer
      ~中性子星の観測と理論~ 研究活性化ワークショップ 2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] Universal relation in supernova gravitational waves2023

    • Author(s)
      Hajime SOTANI
    • Organizer
      Testing Gravity 2023 (TG2023)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] マグネターのクラスト振動2023

    • Author(s)
      祖谷元
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Empirical relation for supernova gravitational waves2022

    • Author(s)
      Hajime SOTANI
    • Organizer
      9th KAGRA International Workshop
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Empirical relation in supernova gravitational waves2022

    • Author(s)
      Hajime SOTANI
    • Organizer
      The 25th annual International Conference on Particle Physics and Cosmology
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Gravitational Waves Asteroseismology in Protoneutron Stars2022

    • Author(s)
      Hajime SOTANI
    • Organizer
      11th Aegean summer school,
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Constraint on the NS model using high-frequency QPOs in magnetar2022

    • Author(s)
      Hajime SOTANI
    • Organizer
      OMEG16
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 冷却中性子星における重力波星震学2022

    • Author(s)
      祖谷元
    • Organizer
      日本物理学会
    • Related Report
      2021 Research-status Report
  • [Presentation] Gravitational wave asteroseismology in protoneutron stars2021

    • Author(s)
      Hajime Sotani
    • Organizer
      NEB-19 Recent Developments in Gravity
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 重力波星震学を用いた中性子星質量と半径の推定2021

    • Author(s)
      祖谷元
    • Organizer
      日本物理学会
    • Related Report
      2021 Research-status Report
  • [Presentation] Gravitational wave asterosesimology and universal relations2021

    • Author(s)
      Hajime Sotani
    • Organizer
      Workshop on "Probe into core-collapse SuperNovae via Gravitational-Wave and neutrino signals (SNeGWv2021)"
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Stability of collapsing protoneutron stars and gravitational waves2021

    • Author(s)
      Hajime Sotani
    • Organizer
      YITP-OzGrav WS “Nuclear burning in massive stars” - towards formation of black-hole binaries-
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 低質量中性子星星震学を用いた原子核飽和パラメータの推定2021

    • Author(s)
      祖谷元
    • Organizer
      日本物理学会
    • Related Report
      2020 Research-status Report
  • [Presentation] 原始中性子星からの重力波振動数における擬交差と固有振動の振る舞い2020

    • Author(s)
      祖谷元
    • Organizer
      日本物理学会
    • Related Report
      2020 Research-status Report

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Published: 2020-02-06   Modified: 2025-01-30  

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