Effects of dust layers on thermal emission from airless bodies

DOI 機関リポジトリ (HANDLE) NDLデジタルコレクション PDF Web Site ほか1件をすべて表示 一部だけ表示 被引用文献9件 参考文献34件 オープンアクセス

書誌事項

公開日
2019-07-08
資源種別
journal article
権利情報
  • © The Author(s). 2019.
  • This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
DOI
  • 10.1186/s40645-019-0291-0
公開者
SpringerOpen

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説明

We have investigated the influence of thin thermally opaque dust layers on the thermal emission of rocks and regolith and determined the thermal response of these dust-covered surfaces to diurnal insolation cycles. Results are computed for Hayabusa2's target asteroid (162173) Ryugu, which was observed by thermal infrared instruments on the orbiter and in situ. We show that even a very thin (10..100 mu m) fine-grained porous dust layer with thermal inertia of 25Jm(-2)K(-1)s(-1/2) can have a significant influence on surface temperatures and alter the apparent thermal inertia of the underlying material derived under the simplified assumption of a homogenous half space by more than 20%. The masking of the underlying material is complete at about 1 diurnal skin depth, corresponding to 10mm on Ryugu. Between 0.1 and 1 diurnal skin depths, we find a thermal lag smaller than what would be predicted for a surface consisting of dust only.If a dust cover were present on Ryugu, this should be clearly visible in the data returned by the orbiter's thermal infrared imager (TIR) and the MASCOT lander's radiometer (MARA), which observed a single boulder at the landing site. However, this appears not to be the case, and dust seems to play a minor role in the thermal emission from the asteroid.

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