An early extrasolar planetary system revealed by planetesimal belts in β Pictoris
An early extrasolar planetary system revealed by planetesimal belts in β Pictoris
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DOI：
10.1038/nature02948
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发表时间：
2004-10
期刊：
影响因子：
64.8
通讯作者：
Y. Okamoto;H. Kataza;M. Honda;T. Yamashita;T. Onaka;J. Watanabe;T. Miyata;S. Sako;T. Fujiyoshi;I. Sakon
中科院分区：
文献类型：
--
作者：
Y. Okamoto;H. Kataza;M. Honda;T. Yamashita;T. Onaka;J. Watanabe;T. Miyata;S. Sako;T. Fujiyoshi;I. Sakon
象限仪座β（β Pic）是一颗主序星星星，边缘有一个尘埃盘，可能代表太阳系早期的一种状态。这些尘埃似乎不是原始原行星盘的残余物，而是被认为是由像星子和/或彗星这样的大型天体产生的。因此，通过高分辨率中红外观测确定尘埃的空间分布、粒度、成分和结晶度，就可以揭示母体的历史和组成。本文报道β Pic周围的亚微米级无定形硅酸盐颗粒在6、16和30 au（1au是日地距离）附近有分布峰值，而晶态和微米级无定形硅酸盐颗粒则集中在盘中心。由于亚微米颗粒被来自中央星星的辐射压力迅速吹出系统，峰值指示正在进行的尘埃补充的位置，这源于星子或“星子带”的环状分布。
β Pictoris (β Pic) is a main-sequence star with an edge-on dust disk,,that might represent a state of the early Solar System. The dust does not seem to be a remnant from the original protoplanetary disk, but rather is thought to have been generated from large bodies like planetesimals and/or comets,. The history and composition of the parent bodies can therefore be revealed by determining the spatial distribution, grain size, composition and crystallinity of the dust through high-resolution mid-infrared observations. Here we report that the sub-micrometre amorphous silicate grains around β Pic have peaks in their distribution around 6, 16 and 30au(1auis the Sun–Earth distance), whereas the crystalline and micrometre-sized amorphous silicate grains are concentrated in the disk centre. As sub-micrometre grains are blown quickly out from the system by radiation pressure from the central star, the peaks indicate the locations of ongoing dust replenishment, which originates from ring-like distributions of planetesimals or ‘planetesimal belts’.