原行星盘中尘埃生长的研究现状

发布时间：2018-03-28 01:06

本文选题：原行星盘　切入点：尘埃生长　出处：《天文学进展》2012年03期

【摘要】：尘埃发射随恒星年龄增加而降低的统计分析,硅酸盐发射谱特征,尘埃盘光深等观测证据都证明原行星盘中尘埃的生长。在这个生长过程中,最主要的生长方式就是碰撞吸附。导致碰撞的因素有很多,由此产生的碰撞速度分布在一个很广的范围中。整个盘中尘埃的生长过程不是同步进行的,不同区域尘埃生长的时标不同,而盘中的物质由于内外流、沉淀等因素,不同区域之间的物质存在交换,所以最终盘中物质的碰撞过程同时存在多种可能。不同碰撞速度、大小、孔隙度的碰撞体之间碰撞的结果存在巨大差异,这些差异对尘埃生长起了决定影响,而尘埃的生长直接影响原行星盘的性质以及盘中行星形成的过程。因此,研究尘埃在盘中的生长过程,不但能够深入了解原行星盘的性质,也能揭示行星形成早期物质的演化过程。
[Abstract]:The statistical analysis of dust emission decreasing with the age of the star, the characteristics of silicate emission spectrum, the depth of dust disk and other observational evidence all prove the growth of dust in the original planetary disk. The most important growth pattern is collision adsorption. There are many factors leading to the collision, and the resulting collision velocity is distributed over a wide range. The entire dust growth process in the disk is not synchronized. The time scale of dust growth varies from region to region, and the matter in the disk is exchanged between different regions due to internal and external flow, sedimentation and other factors, so there are many possibilities for the collision process of the material in the disk at the same time. Different collision velocities, There are huge differences in the results of collisions between colliders of size and porosity, which have a decisive effect on the growth of dust, and the growth of dust directly affects the properties of the original planetary disk and the formation of planets in the disk. Studying the growth process of dust in disk can not only deeply understand the properties of the original planetary disk, but also reveal the evolution of the matter in the early stage of planetary formation.
【作者单位】：中国科学院紫金山天文台;中国科学院研究生院;
【基金】：国家自然科学基金(10973044,10833001,10573040,10203005) 中国科学院新兴与交叉学科布局试点项目(KJZD-EW-Z001) 江苏省自然科学基金(BK2009341) 紫金山天文台小行星基金会资助课题
【分类号】：P185

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