Meteoritic Evidence for the Infall of Large Interstellar Dust Aggregates during the Formation of the Solar System
Meteoritic Evidence for the Infall of Large Interstellar Dust Aggregates during the Formation of the Solar System
复制标题
太阳系形成过程中大型星际尘埃聚集体坠落的陨石证据
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
J. Wood
中科院分区：
文献类型：
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作者：
J. Wood
短寿命放射性核素26 Al存在于某些陨石的耐火内含物中，而其他陨石则没有，这似乎意味着不含26 Al的内含物的物质在合成太阳系26 Al的天体物理事件发生之前，就已经聚集在太阳系前的星际介质中。不含26 Al的包裹体可以理解为在太阳系形成的坍缩阶段，太阳前尘埃聚集体在落入太阳星云时受到气体拖曳的强烈加热而形成的蒸发残留物。含有26 Al的夹杂物是由在聚集和热处理之前用该核素接种的粉尘形成的。
The presence of the short-lived radionuclide 26Al in some of the refractory inclusions of chondritic meteorites but not in others appears to mean that the substance of the 26Al-free inclusions was brought together in the presolar interstellar medium, before the astrophysical event occurred that synthesized solar system 26Al. The 26Al-free inclusions can be understood as evaporation residues that formed from presolar dust aggregations when they were intensely heated by gas drag as they fell into the solar nebula during the collapse phase of solar system formation. The inclusions containing 26Al were formed from dust that had been seeded with that nuclide prior to aggregation and thermal processing.