First experimental studies of large samples of gas-laden amorphous "cometary" ices

被引：48

作者：

Bar-Nun, A ^{[1
]}

Laufer, D ^{[1
]}

机构：

[1] Tel Aviv Univ, Dept Geophys & Planetary Sci, IL-69978 Tel Aviv, Israel

来源：

ICARUS | 2003年 / 161卷 / 01期

基金：

以色列科学基金会;

关键词：

comets; composition; ices; surfaces; thermal histories;

D O I：

10.1016/S0019-1035(02)00016-7

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In a unique machine, the first of its kind, large (200 cm(2) X 10 cm) samples of gas-laden amorphous ice were prepared at 80 K and 10(-5) Torr. The sample consisted of a fluffy agglomerate of 200-mum ice grains, similar to what is presumed to be the structure of comet nuclei. The sample was heated from above by IR radiation. The properties studied were gas content in the ice and its emanation from the ice upon warming and bearing on the gas/water vapor ratio observed in cometary comae vs this ratio in cometary nuclei and the effect of internal trapped gas on the thermal conductivity of the ice and the density and mechanical properties of pure ice vs gas-laden ice, These findings might have significance for the interpretation of comet observations, the forthcoming ESA's Rosetta space mission to Comet 46P/Wirtanen in 2012, and to other comet missions. (C) 2003 Elsevier Science (USA). All rights reserved.

引用

页码：157 / 163

页数：7

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