Rapid Growth of Asteroids Owing to Very Sticky Interstellar Organic Grains
Rapid Growth of Asteroids Owing to Very Sticky Interstellar Organic Grains
复制标题
由于非常粘稠的星际有机颗粒，小行星的快速增长
DOI：
10.1086/339618
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
N. Maeno
中科院分区：
文献类型：
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作者：
A. Kouchi;T. Kudo;H. Nakano;M. Arakawa;N. Watanabe;S. Sirono;M. Higa;N. Maeno
我们通过实验发现，星际颗粒在小行星带中覆盖着有机质，更重要的是，有机质在小行星的形成中发挥了至关重要的作用。毫米级有机颗粒的黏附阈值速度为5 m s-1，比硅酸盐和冰粒共存的黏附阈值速度高几个数量级。这表明，在小行星区，粘性极强的有机颗粒聚集体和星子的形成非常迅速，甚至覆盖了动荡的太阳星云的早期阶段。相比之下，在地球和木星地区分别没有硅酸盐和冰粒的凝聚。
We experimentally found interstellar grains covered with organic matter in an asteroid belt, and more importantly, the organic matter played an essential role in the formation of the asteroids. The sticking threshold velocityof 5 m s-1 of the millimeter-sized organic grains was several orders of magnitude higher than those of the coexisting silicate and ice grains. This indicated a very rapid coagulation of the very sticky organic grain aggregates and the formation of planetesimals in the asteroid region, covering even the early stage of the turbulent solar nebula. In contrast, there was no coagulation of the silicate and ice grains in the terrestrial and Jovian regions, respectively.