Collisions of solid ice in planetesimal formation
Collisions of solid ice in planetesimal formation
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DOI：
10.1093/mnras/stv2952
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发表时间：
2016-03-11
影响因子：
4.8
通讯作者：
Teiser, J.
中科院分区：
文献类型：
--
作者：
Deckers, J.;Teiser, J.
我们进行了厘米弹丸与分米目标（均由固体冰组成）的碰撞实验，速度为 15-45 m s(-1)，平均温度为 T-avg = 255.8 +/- 0.7 K。在这些碰撞中，厘米弹体被破坏，部分物体粘在目标上。这种行为可以在上限阈值内观察到，该阈值取决于弹丸尺寸，超过该阈值就不会发生传质。在由厘米射弹破坏产生的小颗粒碰撞中，我们还发现向目标的质量传递。这样，较大的物体可以获得质量，尽管初始传质的效率相当低。这些碰撞结果可以应用于雪线附近的星子形成，那里的蒸发和凝结预计会产生固体冰。在速度高达约 7 m s(-1) 的自由落体碰撞中，我们研究了厘米冰球的破碎阈值和恢复系数。
We present collision experiments of centimetre projectiles on to decimetre targets, both made up of solid ice, at velocities of 15-45 m s(-1) at an average temperature of T-avg = 255.8 +/- 0.7 K. In these collisions, the centimetre body gets disrupted and part of it sticks to the target. This behaviour can be observed up to an upper threshold, that depends on the projectile size, beyond which there is no mass transfer. In collisions of small particles, as produced by the disruption of the centimetre projectiles, we also find mass transfer to the target. In this way, the larger body can gain mass, although the efficiency of the initial mass transfer is rather low. These collision results can be applied to planetesimal formation near the snowline, where evaporation and condensation is expected to produce solid ice. In free fall collisions at velocities up to about 7 m s(-1), we investigated the threshold to fragmentation and coefficient of restitution of centimetre ice spheres.