arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1902.08503astro-ph.EP
收藏

原行星盘中水冰的接触-实验室实验

Contacts of Water Ice in Protoplanetary Disks - Laboratory Experiments

Grzegorz Musiolik, Gerhard Wurm

摘要:

水冰在原行星盘中很丰富。因此,其粘附特性在碰撞生长阶段是重要的。在这项工作中,我们研究了1.1毫米的冰粒在不同温度下的粘附和滚动。我们发现在175 K到200 K之间粘附力强烈增加,在更高的温度下趋于稳定。就表面能而言,这是以63.4的因子增加,例如分别从$γ= 0.0029 \rm J/m^2$到$γ= \rm 0.19 J/m^2$。我们还测量了非弹性滚动的临界力。临界滚动距离为0.19 mm。考虑到原行星盘在低温下的星子形成,其表面能并不比硅酸盐尘埃大,冰聚集也有同样的缺点。一般来说,水冰在粘附方面没有硅酸盐的优势,碰撞生长可能也不会有利于冰而不是硅酸盐。

英文摘要:

Water ice is abundant in protoplanetary disks. Its sticking properties are therefore important during phases of collisional growth. In this work, we study the sticking and rolling of 1.1 mm ice grains at different temperatures. We find a strong increase in sticking between 175 K to 200 K which levels off at higher temperatures. In terms of surface energy this is an increase with a factor of 63.4, e.g. from $γ= 0.0029 \rm J/m^2$ to $γ= \rm 0.19 J/m^2$, respectively. We also measured critical forces for inelastic rolling. The critical rolling distance is constant with a value of 0.19 mm. In view of planetesimal formation at low temperatures in protoplanetary disks, the surface energy is not larger than for silicate dust and ice aggregation will share the same shortcommings. In general, water ice has no advantage over silicates for sticking and collisional growth might not favor ice over silicates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑