The distribution of water ice in the interior of Comet Tempel 1
The distribution of water ice in the interior of Comet Tempel 1
复制标题
坦普尔1号彗星内部水冰的分布
DOI：
10.1016/j.icarus.2007.04.024
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发表时间：
2007
期刊：
影响因子：
3.2
通讯作者：
K. Klaasen
中科院分区：
文献类型：
--
作者：
J. Sunshine;O. Groussin;P. Schultz;M. A’Hearn;L. Feaga;T. Farnham;K. Klaasen
“深度撞击”飞船包括一个1.05至4.8 μm红外光谱仪。虽然在撞击区域的表面没有观察到冰，但在撞击事件的喷出物的红外测量中发现了3 μm附近由于水冰而产生的强吸收。水冰的吸收发生在整个红外数据集，从撞击后3秒开始，一直到观测结束，即撞击后45分钟。结合室内撞击实验，分析了抛射物的时空分辨红外光谱。结果表明Tempel 1的内部地层是由脱挥发物质在大约一米的深度过渡到未改变的成分组成的。在与地表热隔离的更深的地方，存在水冰。在10到20米的深度，即撞击所挖掘的最大深度，这些原始材料由非常细粒度（~ 1±1 μm）的水冰颗粒组成，不含难熔杂质。
The Deep Impact flyby spacecraft includes a 1.05 to 4.8 μm infrared (IR) spectrometer. Although ice was not observed on the surface in the impact region, strong absorptions near 3 μm due to water ice are detected in IR measurements of the ejecta from the impact event. Absorptions from water ice occur throughout the IR dataset beginning three seconds after impact through the end of observations, ∼45 min after impact. Spatially and temporally resolved IR spectra of the ejecta are analyzed in conjunction with laboratory impact experiments. The results imply an internal stratigraphy for Tempel 1 consisting of devolatilized materials transitioning to unaltered components at a depth of approximately one meter. At greater depths, which are thermally isolated from the surface, water ice is present. Up to depths of 10 to 20 m, the maximum depths excavated by the impact, these pristine materials consist of very fine grained (∼1±1 μm) water ice particles, which are free from refractory impurities.