• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Breakthrough integrator for the gravitational N-body problem and its application to extrasolar systems

Research Project

Project/Area Number 16K13781
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Foundations of mathematics/Applied mathematics
Research InstitutionTokushima Bunri University

Principal Investigator

Minesaki Yukitaka  徳島文理大学, 保健福祉学部, 講師 (70378834)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords保存量 / 時間可逆性 / スケーリング変換 / N 体問題 / 安定運動可能領域 / 平衡解 / 一般 3 体問題 / 平衡解軌道 / シンプレクティック数値積分法 / 陽解法 / Sundman 曲面 / 一般重力 N 体問題 / スケール変換 / 数理物理 / 計算物理 / 応用数学 / 宇宙物理
Outline of Final Research Achievements

The general N-body problem has some equilibrium solutions and conserved quantities. Further, it is time-reversible. We designed a numerical integrator which maintains all the properties. Because these conserved quantities and equilibrium solutions have important roles in deciding the motion regions for the general three-body problem, our new integrator can precisely trace these regions. Actually, we numerically utilized our integrator to the motion regions of a planet in a binary or two-planet system. By observing the regions, we can clarify whether the orbit of this planet is stable or not.

Academic Significance and Societal Importance of the Research Achievements

太陽系外惑星が持つ軌道の安定性を数値的に評価する際,複雑な座標変換や惑星質量を無視するなどの近似が行われることが多かった.このような操作なしに数値計算を行っても,軌道を正確に計算できる保障はなかったからである.研究代表者が開発した新解法はこの問題を克服した.二重星内の一惑星や単独星を周回する二惑星に新解法を適用することで,それらの軌道安定性を簡便・高速・極めて長時間かつ高精度に判定できるようにした.

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (7 results)

All 2019 2018 2017 2016

All Journal Article (4 results) (of which Peer Reviewed: 3 results,  Acknowledgement Compliant: 2 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Totally Conservative Integration Method for the General Three-body Problem and Its Lagrangian Solutions2019

    • Author(s)
      Yukitaka Minesaki
    • Journal Title

      The Astrophysical Journal

      Volume: 873 Issue: 1 Pages: 4-4

    • DOI

      10.3847/1538-4357/ab03cc

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Equilibrium Solutions of the Logarithmic Hamiltonian Leapfrog for the N-body Problem2018

    • Author(s)
      Yukitaka Minesaki
    • Journal Title

      The Astrophysical Journal

      Volume: 857 Issue: 2 Pages: 92-92

    • DOI

      10.3847/1538-4357/aab2ab

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] n-gon Equilibria of the Discrete (1+n)-body problem2017

    • Author(s)
      Yukitaka Minesaki
    • Journal Title

      The Astrophysical Journal

      Volume: 835 Pages: 253-253

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Discrete-time N-body Problem and its Equilibrium Solutions2017

    • Author(s)
      Yukitaka Minesaki
    • Journal Title

      MI Lecture Note

      Volume: 74 Pages: 34-39

    • Related Report
      2016 Research-status Report
    • Open Access / Acknowledgement Compliant
  • [Presentation] N-body solvers based on totally conservative Kepler solvers and their equilibria2018

    • Author(s)
      Yukitaka Minesaki
    • Organizer
      13th International Conference on Symmetries and Integrability of Difference Equations (SIDE 13)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Discrete-time N-body Problem and its Equilibrium Solutions2016

    • Author(s)
      Yukitaka Minesaki
    • Organizer
      Geometric Numerical Integration
    • Place of Presentation
      オーストラリア メルボルン
    • Year and Date
      2016-12-05
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Accurate Integration of the general N-body Problem which retains elliptic relative equilibrium orbits2016

    • Author(s)
      Yukitaka Minesaki
    • Organizer
      The 3rd China-Japan Joint Workshop on Integrable System
    • Place of Presentation
      中華人民共和国 西安
    • Year and Date
      2016-08-19
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited

URL: 

Published: 2016-04-21   Modified: 2020-03-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi