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An early extrasolar planetary system revealed by planetesimal belts in beta Pictoris

机译:beta Pictoris中的小行星带揭示了一个早期的太阳系外行星系统

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beta Pictoris (beta Pic) is a main-sequence star with an edge-on dust disk(1-3) 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(4,5). 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 beta Pic have peaks in their distribution around 6, 16 and 30 AU (1 AU is 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'.
机译:beta Pictoris(beta Pic)是一个主要序列恒星,带有边缘尘埃盘(1-3),可能代表早期太阳系的状态。尘埃似乎并不是原始原行星盘的残留物,而是被认为是由诸如行星小行星和/或彗星之类的大物体产生的(4,5)。因此,可以通过高分辨率的中红外观测来确定尘埃的空间分布,晶粒大小,组成和结晶度,从而揭示出母体的历史和组成。在这里我们报告说,βPic附近的亚微米无定形硅酸盐晶粒在6、16和30 AU附近分布有峰值(1 AU是太阳-地球距离),而结晶和微米级的无定形硅酸盐晶粒集中在磁盘中心。随着亚微米颗粒通过中心恒星的辐射压力从系统中迅速吹出,这些峰表明了正在进行的粉尘补给的位置,这些粉尘源于小行星或“小行星带”的环状分布。

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