EXPERIMENTAL STUDY ON BOUNCING BARRIERS IN PROTOPLANETARY DISKS

EXPERIMENTAL STUDY ON BOUNCING BARRIERS IN PROTOPLANETARY DISKS
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原行星盘中弹跳势垒的实验研究

DOI:
10.1088/0004-637x/783/2/111
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发表时间:
2014
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
M. Köster
M. Köster
中科院分区:
--
文献类型:
--
作者:
T. Kelling;G. Wurm;M. Köster

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对于原行星盘中的尘埃聚集体,过去已经观察到在毫米到厘米尺寸的单独碰撞中粘滞和弹跳之间的过渡。这就引出了一个反弹障碍的概念,因为这个障碍,增长就会停滞。在这里,我们提出了长期的实验室实验的结果,反复聚集碰撞的弹跳障碍。观测到约100个粒径为1 mm的SiO2尘埃聚集体相互作用.碰撞发生的速度范围从毫米秒-1以下到厘米秒-1。骨料在900 s的时间内不断相互作用。在此期间,发生了超过105次碰撞。对近2000次碰撞进行了详细分析。即使发生粘附碰撞,也没有观察到较大聚集体的时间稳定的净增长。聚集在一起的更大的集合体形成,但在进一步的碰撞演化过程中再次分解。弹跳屏障的概念支持通过种子碰撞生长形成星子,以及通过引力不稳定性,有利于将显着的总质量限制在一定的尺寸范围内。在我们的参数集内,实验证实弹跳障碍是自洽粒子生长的一种可能的和可能的进化极限。
For dust aggregates in protoplanetary disks, a transition between sticking and bouncing in individual collisions at mm to cm sizes has been observed in the past. This leads to the notion of a bouncing barrier for which growth gets stalled. Here, we present long-term laboratory experiments on the outcome of repeated aggregate collisions at the bouncing barrier. About 100 SiO 2 dust aggregates 1 mm in size were observed interacting with each other. Collisions occurred within a velocity range from below mm s− 1 up to cm s− 1. Aggregates continuously interacted with each other over a period of 900 s. During this time, more than 10 5 collisions occurred. Nearly 2000 collisions were analyzed in detail. No temporal stable net growth of larger aggregates was observed even though sticking collision occurred. Larger ensembles of aggregates sticking together were formed but were disassembled again during further collisional evolution. The concept of a bouncing barrier supports the formation of planetesimals by seeded collisional growth, as well as by gravitational instability favoring a significant total mass being limited to certain size ranges. Within our parameter set, the experiments confirm that bouncing barriers are one possible and likely evolutionary limit of self-consistent particle growth.
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发表时间: 2012-07
影响因子: 6.5
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影响因子: 6.5
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DOI: --
发表时间: 2005
期刊:
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