Optical properties of dust aggregates in the disk of Beta Pictoris

• Nakamura R.

  Information Processing Center, Kobe University

書誌事項

タイトル別名

• Optical properties of dust aggregates i

抄録

Dust particles in the disk of Beta Pictoris (β Pic) is modeled by fluffy aggregates consisting of slightly modified interstellar grains. We calculate the optical properties by Discrete Dipole Approximation with a1-term method. It is found that the characteristic size of an aggregate is defined by the radius of volume-equivalent sphere. The wavelength dependence of the scattering efficiency in visible becomes flat when the volume-equivalent sphere exceeds 1 μm irrespective of the monomer size, while the infrared silicate feature is present even for aggregates larger than 10 μm. Therefore, our model can account for the coexistence of the neutral scattering and silicate feature in the β Pic disk without detailed tuning of the dust size distribution. Due to the enhancement of geometrical cross section, aggregates generally show higher scattering and absorption efficiencies in visible compared with the volume-equivalent sphere. In contrast, the absorption efficiency for an aggregate is comparable to that for the volume-equivalent sphere when the size is smaller than wavelength. These properties are also consistent with the observed superheat and high albedo of the dust particles in the β Pic disk.

収録刊行物

• Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ

  Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ 50 (6-7), 587-593, 1998

  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

• Space and Planetary Science
• Geology

詳細情報

• CRID: 1390282681485618688
• NII論文ID: 10002207280
• NII論文ID: 130003780732
• NII書誌ID: AA11211921
• DOI: 10.1186/bf03352152
• COI: 1:CAS:528:DyaK1cXntlSis7k%3D
• ISSN: 18805981
• ISSN: 13438832
• NDL書誌ID: 4552213
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4552213
• Web Site: https://link.springer.com/content/pdf/10.1186/BF03352152.pdf
• Web Site: https://link.springer.com/article/10.1186/BF03352152/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1186/BF03352152
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可