A New Development of Chondrule Formation Theory : Based on a Comparison with Cosmic Spherules

2011 Fiscal Year Final Research Report

• Project/Area Number: 21540434
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: NAKAMOTO Taishi 東京工業大学, 大学院・理工学研究科, 准教授 (60261757)
• Project Period (FY): 2009 – 2011
• Keywords: 惑星形成 / 隕石 / コンドリュール / 宇宙塵

Research Abstract

Formation mechanism of chondrules, which are included in most of meteorites, has not been understood clearly. To elucidate the formation process, we approach to the formation process of cosmic spherules that are silicate small particles similar to chondrules. First, we measure the shape, chemical composition, and texture of each cosmic spherule. We find a clear correlation among them. Also, we find that the correlation can be understood quantitatively using a theory of the motion of the particle in the Earth atmosphere and the heating/cooling to the particle. Based on these understandings, we expect new studies on the formation mechanism of chondrules should be developed.

Research Products

• [Journal Article] Effect of Photodesorption on Snow Line at the Surface of Optically Thick Circumstellar Disks Around Herbig Ae/BeStars (2012)
  • Author(s): Oka, A., Inoue, A. K., Nakamoto, T., andHonda, M.
  • Journal Title: Astrophysical Journal Volume: 747 Pages: 138-149
  • DOI: doi:10.1088/0004-637X/747/2/138
  • Peer Reviewed
• [Journal Article] Evolution of Snow Line in Optically Thick Protoplanetary Disks : Effects of Water Ice Opacity and Dust Grain Size (2011)
  • Author(s): Oka, A., Nakamoto, T., and Ida, S.
  • Journal Title: Astrophysical Journal Volume: 738 Pages: 141-151
  • DOI: doi:10.1088/0004-637X/738/2/
  • Peer Reviewed
• [Journal Article] Formation of Cosmic Crystals in Highly-Supersaturated Silicate Vapor Produced by PlanetesimalBow Shocks (2010)
  • Author(s): Miura, H., Tanaka, K. K., Yamamoto, T., Nakamoto, T., Yamada, J., Tsukamoto, K., and Nozawa, J.
  • Journal Title: Astrophysical Journal Volume: 719 Pages: 642-654
  • DOI: doi:10.1088/0004-637X/719/1/642
  • Peer Reviewed
• [Presentation] Correlation among Shape (2012)
  • Author(s): Nakamoto, T., Doi, M., Nakamura, T., and Yamauchi, Y., A
  • Organizer: Composition, and Texture of Cosmic Spherules
  • Place of Presentation: ウィーン
  • Year and Date: 2012-04-27
• [Presentation] 宇宙塵の組成,組織,形状の関係とその起源 (2011)
  • Author(s): 土居政雄,中本泰史,中村智樹,山内佑司
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 鹿児島大学
  • Year and Date: 2011-09-19
• [Presentation] Three-Dimensional Shapes of Cosmic Spherules : Deformation of Dust Particles Molten in the Earth Atmosphere (2010)
  • Author(s): Doi, M., Nakamoto, T., Nakamura, T., and Yamauchi, Y.
  • Organizer: Asia Oceania Geosciences Society Annual Meeting
  • Place of Presentation: India
  • Year and Date: 20100705-09
• [Book] ここまでわかった新・太陽系 (2009)
  • Author(s): 井田茂,中本泰史
  • Total Pages: 286
  • Publisher: ソフトバンククリエイティブ