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Observational and theoretical studies on the disk instability in dwarf novae and application to active galactic nuclei

Research Project

Project/Area Number 20K22374
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0204:Astronomy, earth and planetary science, and related fields
Research InstitutionKanazawa University (2023)
Institute of Physical and Chemical Research (2020-2022)

Principal Investigator

Kimura Mariko  金沢大学, 先端宇宙理工学研究センター, 助教 (40879699)

Project Period (FY) 2020-09-11 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords降着円盤 / 数値シミュレーション / 激変星 / X線連星 / 活動銀河核 / 矮新星 / X線観測 / 粘性 / 白色矮星 / 不安定性 / 多波長観測
Outline of Research at the Start

本研究では、宇宙における様々な爆発的増光現象を統一的に理解するための第一歩として、その中心エンジンであると考えられている降着円盤の研究を行う。主な対象天体は、観測しやすくこれまでに最も降着円盤の研究が進んでいる矮新星である。矮新星における突発的増光現象は降着円盤の熱不安定によるものだと考えられているが、その全貌は明らかになっていない。本研究では、多波長観測と円盤半径可変の数値シミュレーションを用いて円盤不安定モデルを検証・改良する。また、矮新星の研究で得られる知見を応用し、活動銀河核における円盤由来の突発的増光現象を解明することにも挑戦する。

Outline of Final Research Achievements

In order to understand the diversity of dwarf nova outbursts revealed by recent advances in observational techniques, we have improved the disk instability model and performed numerical simulations. As a result, we succeeded in reproducing the luminosity variations of multiple sources. We have also improved the numerical simulation code to apply our research not only to dwarf novae but also to other accretion disk objects such as X-ray binary stars and active galactic nuclei.

Academic Significance and Societal Importance of the Research Achievements

近年、時間領域天文学の発達により、突発天体の研究が盛んになっている。コンパクト天体への突発的ガス降着は、大量の重力エネルギーを放射エネルギーとして解放する、宇宙で最も激しい突発現象の中心エンジンである。その中心エンジンの活動性を調べるために最適な天体の一つが矮新星であり、本研究で得られた成果は他の様々な突発天体の研究に応用可能である。

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

    (16 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (4 results) Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (9 results) (of which Int'l Joint Research: 3 results,  Invited: 3 results)

  • [Int'l Joint Research] NASA Goddard Space Flight Center/Caltech(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Crimean Astrophysical Observatory(ロシア連邦)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] NASA Goddard Space Flight Center(米国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Crimean Astrophysical Observatory of RAS(ロシア連邦)

    • Related Report
      2020 Research-status Report
  • [Journal Article] The light curve simulations of the 2021 anomalous event in SS Cygni2022

    • Author(s)
      Kimura Mariko、Osaki Yoji
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 75 Issue: 1 Pages: 250-268

    • DOI

      10.1093/pasj/psac106

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] KIC 9406652: A laboratory for tilted disks in cataclysmic variable stars. II. Modeling of the orbital light curves2021

    • Author(s)
      Kimura Mariko、Osaki Yoji
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 73 Issue: 5 Pages: 1225-1239

    • DOI

      10.1093/pasj/psab069

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] On the nature of the anomalous event in 2021 in the dwarf nova SS?Cygni and its multi-wavelength transition2021

    • Author(s)
      Kimura M.、Yamada S.、Nakaniwa N.、Makita Y.、Negoro H.、Shidatsu M.、Kato T.、Enoto T.、Isogai K.、Mihara T.、Akazawa H.、Gendreau K., Hambsch F.、Dubovsky F.、Kudzej I.、Kasai K.、Tordai T.、Pavlenko E.、Sosnovskij A.、Babina J. 他3名
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 73 Issue: 5 Pages: 1262-1279

    • DOI

      10.1093/pasj/psab073

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] The 2021 anomalous event and its precursor of the dwarf nova SS Cyg2023

    • Author(s)
      Mariko Kimura
    • Organizer
      Vasto accretion meeting 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The 2021 anomalous event and its precursor of the dwarf nova SS Cyg2023

    • Author(s)
      Mariko Kimura
    • Organizer
      The Golden Age of Cataclysmic Variables and Related Objects VI
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 数値シミュレーションによる、矮新星 SS Cyg における異常な光度変動の再現2023

    • Author(s)
      木邑真理子
    • Organizer
      日本天文学会2023年秋季年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 矮新星 MASTER OT J030227.28+191754.5 における、アウトバースト中のX線放射の起源2023

    • Author(s)
      木邑真理子
    • Organizer
      日本天文学会春季年会
    • Related Report
      2022 Research-status Report
  • [Presentation] 矮新星の多波長観測が拓くサイエンス:SS Cygの可視光・X線の同時観測を例にとって2022

    • Author(s)
      木邑真理子
    • Organizer
      激変星研究会 2022
    • Related Report
      2022 Research-status Report
  • [Presentation] 矮新星 SS Cygにおける2021年の異常な光度変動とその前兆現象の正体2022

    • Author(s)
      木邑真理子
    • Organizer
      日本天文学会秋季年会
    • Related Report
      2022 Research-status Report
  • [Presentation] Optical & X-ray simultaneous observations of the brightest dwarf nova SS Cyg2022

    • Author(s)
      木邑真理子
    • Organizer
      連星系・変光星研究会2022
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] 矮新星 KIC 9406652 における、公転軌道面から傾いた降着円盤の性質の調査 II. super-orbital signals2020

    • Author(s)
      木邑真理子
    • Organizer
      日本天文学会春季年会
    • Related Report
      2020 Research-status Report
  • [Presentation] Multi-wavelength study of X-ray binaries and cataclysmic variables - a new window through high-speed observations -2020

    • Author(s)
      木邑真理子
    • Organizer
      FORCE 4th meeting
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2020-09-29   Modified: 2025-01-30  

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