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A study of compact binaries including neutron stars with internal state

Research Project

Project/Area Number 17K05447
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionUniversity of the Ryukyus

Principal Investigator

TANIGUCHI Keisuke  琉球大学, 理学部, 准教授 (70586528)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords宇宙物理 / 一般相対論 / 中性子星 / ブラックホール / 連星系 / 準平衡解 / 数値計算 / 弾性体 / 内部状態 / スペクトル法 / コンパクト連星 / 重力波
Outline of Final Research Achievements

Compact binary systems gradually decreases their orbital separations and eventually merge due to the emission of gravitational waves. In this research program, we have tackled a numerical study of compact binaries including neutron stars with internal states in quasi-equilibrium before merger. First, we divide the interior of a neutron star into two regions, the inner region, core, and the outer region, crust. Then, we formulate the way to treat the core as perfect fluid and the crust as elastic body. Based on the formulation, we try to develop a numerical code to construct such neutron stars.

Academic Significance and Societal Importance of the Research Achievements

現在、日本・アメリカ・ヨーロッパでレーザー干渉計を使った重力波観測が行われている。中性子星を含むコンパクト連星が合体直前に放出する重力波を観測した場合、その波形を用いて潮汐作用による中性子星の変形度を推定し、それを元に中性子星核物質の状態方程式の情報を得ることが可能である。本研究では、中性子星の変形度に影響を与える中性子星の内部構造・状態を考慮に入れることで、中性子星核物質の状態方程式を解明するための基礎研究に寄与した。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (9 results)

All 2019 2018 2017 Other

All Int'l Joint Research (3 results) Journal Article (6 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 6 results,  Open Access: 1 results)

  • [Int'l Joint Research] Observatoire de Paris(フランス)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] University of Cambridge/Queen Mary University of London(英国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] University of Illinois(米国)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Revisiting the lower bound on tidal deformability derived by AT 2017gfo2019

    • Author(s)
      Kenta Kiuchi, Koutarou Kyutoku, Masaru Shibata, Keisuke Taniguchi
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 876 Issue: 2 Pages: L31-L31

    • DOI

      10.3847/2041-8213/ab1e45

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] New code for equilibriums and quasiequilibrium initial data of compact objects. IV. Rotating relativistic stars with mixed poloidal and toroidal magnetic fields2019

    • Author(s)
      Koji Uryu, Shijun Yoshida, Eric Gourgoulhon, Charalampos Markakis, Kotaro Fujisawa, Antonios Tsokaros, Keisuke Taniguchi, and Yoshiharu Eriguch
    • Journal Title

      Physical Review D

      Volume: 100 Issue: 12 Pages: 123019-123019

    • DOI

      10.1103/physrevd.100.123019

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Neutrino transport in black hole-neutron star binaries: Neutrino emission and dynamical mass ejection2018

    • Author(s)
      Kyutoku Koutarou、Kiuchi Kenta、Sekiguchi Yuichiro、Shibata Masaru、Taniguchi Keisuke
    • Journal Title

      Physical Review D

      Volume: 97 Issue: 2 Pages: 023009-023009

    • DOI

      10.1103/physrevd.97.023009

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Frequency-domain gravitational waveform models for inspiraling binary neutron stars2018

    • Author(s)
      Kawaguchi Kyohei、Kiuchi Kenta、Kyutoku Koutarou、Sekiguchi Yuichiro、Shibata Masaru、Taniguchi Keisuke
    • Journal Title

      Physical Review D

      Volume: 97 Issue: 4 Pages: 044044-044044

    • DOI

      10.1103/physrevd.97.044044

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Sub-radian-accuracy gravitational waveforms of coalescing binary neutron stars in numerical relativity2017

    • Author(s)
      Kiuchi Kenta、Kawaguchi Kyohei、Kyutoku Koutarou、Sekiguchi Yuichiro、Shibata Masaru、Taniguchi Keisuke
    • Journal Title

      Physical Review D

      Volume: 96 Issue: 8 Pages: 84060-84060

    • DOI

      10.1103/physrevd.96.084060

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Modeling differential rotations of compact stars in equilibriums2017

    • Author(s)
      Uryu Koji、Tsokaros Antonios、Baiotti Luca、Galeazzi Filippo、Taniguchi Keisuke、Yoshida Shin’ichirou
    • Journal Title

      Physical Review D

      Volume: 96 Issue: 10

    • DOI

      10.1103/physrevd.96.103011

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research

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Published: 2017-04-28   Modified: 2021-02-19  

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