Fingerprints of the Protosolar Cloud Collapse in the Solar System. II. Nucleosynthetic Anomalies in Meteorites
Fingerprints of the Protosolar Cloud Collapse in the Solar System. II. Nucleosynthetic Anomalies in Meteorites
复制标题
太阳系原太阳云塌陷的指纹。
DOI：
--
复制
发表时间：
2019
影响因子：
4.9
通讯作者：
S. Charnoz
中科院分区：
文献类型：
--
作者：
E. Jacquet;F. Pignatale;M. Chaussidon;S. Charnoz
陨石分析所显示的太阳系同位素的不均匀性在其最早的天体--富钙铝包裹体（CAIs）中更为明显。这表明它是从原太阳云中星尘种群的空间变化中遗传而来的。我们模拟了太阳原行星盘的形成后，其崩溃，并发现，固体加权标准偏差的不同核合成的贡献，在磁盘上减少了一个数量级相比，原太阳云，其连续的同位素签名由CAIs。在r-过程的组件，其比例被推断为已减少近年底的下降，碳质方解石的富集是一致的，其形成在大日心距离，早期的签名会优先保存后向外平流。我们还认为，热处理对大块陨石中难熔元素的（与质量无关的）同位素组成影响不大。
The isotopic heterogeneity of the solar system shown by meteorite analyses is more pronounced for its earliest objects, the calcium–aluminum-rich inclusions (CAIs). This suggests that it was inherited from spatial variations in stardust populations in the protosolar cloud. We model the formation of the solar protoplanetary disk following its collapse and find that the solid-weighted standard deviation of different nucleosynthetic contributions in the disk is reduced by one order of magnitude compared to the protosolar cloud, whose successive isotopic signatures are fossilized by CAIs. The enrichment of carbonaceous chondrites in r-process components, whose proportions are inferred to have diminished near the end of infall, is consistent with their formation at large heliocentric distances, where the early signatures would have been preferentially preserved after outward advection. We also argue that thermal processing had little effect on the (mass-independent) isotopic composition of bulk meteorites for refractory elements.
影响因子：
5
作者：
Koop, Levke;Nakashima, Daisuke;Davis, Andrew M.
通讯作者：
Davis, Andrew M.