Interpretation of Wild 2 dust fine structure: Comparison of Stardust aluminum foil craters to the three‐dimensional shape of experimental impacts by artificial aggregate particles and meteorite powders
Interpretation of Wild 2 dust fine structure: Comparison of Stardust aluminum foil craters to the three‐dimensional shape of experimental impacts by artificial aggregate particles and meteorite powders
复制标题
解读Wild 2尘埃精细结构：星尘铝箔陨石坑与人工骨料颗粒和陨石粉实验撞击的三维形状对比
DOI：
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
N. Teslich
中科院分区：
文献类型：
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作者：
A. Kearsley;M. Burchell;M. Price;G. Graham;P. Wozniakiewicz;M. Cole;N. J. Foster;N. Teslich
摘要-新的实验结果表明，星尘陨石坑的形态是一致的解释，许多较大的野生2尘埃颗粒的聚集体，虽然大多数低孔隙率，因此相对较高的密度。大多数大的星尘颗粒（即携带大部分彗星尘埃质量的颗粒）的密度可能为2.4 g cm−3（类似于早期校准实验中使用的钠钙玻璃）或更大，孔隙率为25%或更小，类似于固结的碳质球粒陨石，远低于分形尘埃聚集体的80%。虽然需要更好的尺寸校准来解释最小的撞击颗粒，但我们认为聚集体可能具有以μm尺度和较小的亚颗粒为主的致密组分。如果怀尔德2号的核孔隙度很高，并且与其他彗星的体积密度相似，那么大部分的孔隙空间可能在几十微米的尺度上，在更粗糙、更致密的颗粒之间。
Abstract— New experimental results show that Stardust crater morphology is consistent with interpretation of many larger Wild 2 dust grains being aggregates, albeit most of low porosity and therefore relatively high density. The majority of large Stardust grains (i.e. those carrying most of the cometary dust mass) probably had density of 2.4 g cm−3 (similar to soda‐lime glass used in earlier calibration experiments) or greater, and porosity of 25% or less, akin to consolidated carbonaceous chondrite meteorites, and much lower than the 80% suggested for fractal dust aggregates. Although better size calibration is required for interpretation of the very smallest impacting grains, we suggest that aggregates could have dense components dominated by μm‐scale and smaller sub‐grains. If porosity of the Wild 2 nucleus is high, with similar bulk density to other comets, much of the pore space may be at a scale of tens of micrometers, between coarser, denser grains.
星尘之后的短周期木星家族彗星
影响因子：
2.4
作者：
Burchell M
通讯作者：
Burchell M