在HD163296原行星环系统中的亚毫米尘埃极化和不透明度
Submillimetre dust polarisation and opacity in the HD163296 protoplanetary ring system
摘要：
我们提出的ALMA图像的亚毫米连续偏振和光谱指数的原行星环盘HD 163296。在870μm处的偏振分数在中心核心中被测量为约0.9%，并且通常沿着盘主轴随着半径而增加。它在尘埃环之间的间隙中达到峰值，最大值（~4%）出现在1号和2号环之间。偏振矢量在中心芯中与圆盘短轴对齐，但在间隙中变得更加方位角，在环1和2之间的间隙中扭转高达+/-9度。这些一般特性与环形结构中的自散射辐射的模型一致，而不需要额外的灰尘对准机构。870/1300μm的尘埃光谱指数在中心和内环呈现最小值，表明这些区域具有高的光学厚度。然而，需要在更高分辨率下进一步改进尘埃或盘模型，以同时再现所观察到的偏振度和低光谱指数。
英文摘要：
We present ALMA images of the sub-mm continuum polarisation and spectral index of the protoplanetary ringed disk HD163296. The polarisation fraction at 870μm is measured to be ~0.9% in the central core and generally increases with radius along the disk major axis. It peaks in the gaps between the dust rings, and the largest value (~4%) is found between rings 1 and 2. The polarisation vectors are aligned with the disk minor axis in the central core, but become more azimuthal in the gaps, twisting by up to +/-9degrees in the gap between rings 1 and 2. These general characteristics are consistent with a model of self-scattered radiation in the ringed structure, without requiring an additional dust alignment mechanism. The 870/1300μm dust spectral index exhibits minima in the centre and the inner rings, suggesting these regions have high optical depths. However, further refinement of the dust or the disk model at higher resolution is needed to reproduce simultaneously the observed degree of polarisation and the low spectral index.
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