Were planetesimals formed by dust accretion in the solar nebula?

• Sekiya Minoru

  Department of Earth and Planetary Sciences, Faculty of Sciences

• Takeda Hidenori

  Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University

抄録

The growth of meter-sized bodies in the solar nebula by dust accretion is examined. The meter-sized bodies have velocity about 50 m/s relative to the gas and small dust aggregates. When a small dust aggregate hits a meter-sized body, the aggregate breaks into dust monomers. These monomers accrete onto the body after several bouncing as proposed by Wurm et al., Icarus (2001), if the mean free path of the gas molecules is larger than the radius of the body. On the other hand, the monomers never hit the surface of the body again, if the body is much larger than the mean free path of the molecules. The sizes of bodies would be limited to the order of 10 times the mean free path. Kilometer-sized planetesimals were hardly formed by dust accretion in the region within 5 AU from the sun where the mean free path is less than 1 m. The planetesimals were probably formed by the gravitational instabilities in this region.

収録刊行物

• Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ

  Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ 55 (5), 263-269, 2003

  地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会

キーワード

• Planets, solar system
• solar nebula
• planetesimals

詳細情報

• CRID: 1390282681489710208
• NII論文ID: 10011442639
• NII書誌ID: AA11211921
• DOI: 10.1186/bf03351758
• COI: 1:CAS:528:DC%2BD3sXmtF2lt7c%3D
• ISSN: 18805981
• ISSN: 13438832
• ISSN: http://id.crossref.org/issn/13438832
• NDL書誌ID: 6578011
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6578011
• Web Site: https://link.springer.com/content/pdf/10.1186/BF03351758.pdf
• Web Site: https://link.springer.com/article/10.1186/BF03351758/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1186/BF03351758
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
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