行星幼苗的生长与形态：微重力聚集实验的结果
Growth and form of planetary seedlings: results from a microgravity aggregation experiment.
作者信息
Blum J, Wurm G, Kempf S, Poppe T, Klahr H, Kozasa T, Rott M, Henning T, Dorschner J, Schräpler R, Keller H U, Markiewicz W J, Mann I, Gustafson B A, Giovane F, Neuhaus D, Fechtig H, Grün E, Feuerbacher B, Kochan H, Ratke L, El Goresy A, Morfill G, Weidenschilling S J, Schwehm G, Metzler K, Ip W H
机构信息
Astrophysical Institute and University Observatory, University of Jena, Schillergässchen 2-3, 07745 Jena, Germany.
出版信息
Phys Rev Lett. 2000 Sep 18;85(12):2426-9. doi: 10.1103/PhysRevLett.85.2426.
The outcome of the first stage of planetary formation, which is characterized by ballistic agglomeration of preplanetary dust grains due to Brownian motion in the free molecular flow regime of the solar nebula, is still somewhat speculative. We performed a microgravity experiment flown onboard the space shuttle in which we simulated, for the first time, the onset of free preplanetary dust accumulation and revealed the structures and growth rates of the first dust agglomerates in the young solar system. We find that a thermally aggregating swarm of dust particles evolves very rapidly and forms unexpected open-structured agglomerates.
行星形成第一阶段的结果仍有些难以确定，该阶段的特征是在太阳星云的自由分子流状态下，由于布朗运动，行星前尘埃颗粒进行弹道聚集。我们在航天飞机上进行了一项微重力实验，首次模拟了自由的行星前尘埃积累的开始，并揭示了年轻太阳系中第一批尘埃聚集体的结构和生长速率。我们发现，一群热聚集的尘埃颗粒演化得非常迅速，并形成了意想不到的开放结构聚集体。
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