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Planet formation around AGNs

Research Project

Project/Area Number 18K18774
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 16:Astronomy and related fields
Research InstitutionKagoshima University

Principal Investigator

WADA KEIICHI  鹿児島大学, 理工学域理学系, 教授 (30261358)

Co-Investigator(Kenkyū-buntansha) 小久保 英一郎  国立天文台, 天文シミュレーションプロジェクト, 教授 (90332163)
Project Period (FY) 2018-06-29 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords系外惑星 / 活動銀河中心核 / ダスト / 超巨大ブラックホール / 巨大ブラックホール / 重力多体系 / 銀河 / 惑星形成 / 星ダスト / ダスト成長 / 活動銀河核
Outline of Final Research Achievements

We found that a new class of planets, 'blanets' (i.e., black hole planets), can be formed from dust monomers around supermassive black holes (SMBHs) in the galactic center (Wada et al. 2019). We then investigated the dust coagulation processes and physical conditions of the blanet formation outside the snow line in more detail, especially considering the effect of the radial advection of the dust aggregates. We confirmed the necessary conditions for the blanet formation. The formation timescale of blanets is 70-80 million years for the SMBH mass of one million solar masses. The mass of the blanets ranges from 20 to 3000 Earth mass. Our results suggest that blanets could be formed around relatively low-luminosity AGNs during their lifetime (< 100 million years). The Discovery of blanets in external galaxies requires a breakthrough in observational technology.

Academic Significance and Societal Importance of the Research Achievements

惑星形成と超巨大ブラックホールというこれまでまったく無関係だった2つの研究分野が理論的に関連することが世界で初めて示され、天文学や物理学の応用性や理論天文学の手法の有効性を示すことができた。

Report

(5 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (4 results)

All 2021 2019 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (1 results) Remarks (1 results)

  • [Journal Article] Formation of “Blanets” from Dust Grains around the Supermassive Black Holes in Galaxies2021

    • Author(s)
      Wada Keiichi、Tsukamoto Yusuke、Kokubo Eiichiro
    • Journal Title

      The Astrophysical Journal

      Volume: 909 Issue: 1 Pages: 96-96

    • DOI

      10.3847/1538-4357/abd40a

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Planet Formation around Supermassive Black Holes in the Active Galactic Nuclei2019

    • Author(s)
      Wada, Keiichi; Tsukamoto, Yusuke; Kokubo, Eiichiro
    • Journal Title

      The Astrophysical Journal

      Volume: 886 Issue: 2 Pages: 107-113

    • DOI

      10.3847/1538-4357/ab4cf0

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 超巨大ブラックホールを周回する岩石・氷天体 blanet の形成2021

    • Author(s)
      和田桂一、塚本裕介、小久保英一郎
    • Organizer
      日本天文学会2021年春季年会
    • Related Report
      2020 Research-status Report
  • [Remarks] ブラックホールの周りに広がる新たな「惑星」の世界

    • URL

      https://www.nao.ac.jp/news/science/2019/20191125-cfca.html

    • Related Report
      2019 Research-status Report

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Published: 2018-07-25   Modified: 2023-01-30  

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