Submillimetre dust polarization and opacity in the HD163296 protoplanetary ring system

Submillimetre dust polarization and opacity in the HD163296 protoplanetary ring system
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HD163296 原行星环系统中的亚毫米尘埃偏振和不透明度

DOI:
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发表时间:
2018
影响因子:
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通讯作者:
I. Gregorio
I. Gregorio
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作者:
W. Dent;C. Pinte;C. Pinte;P. Cortés;F. Ménard;Antonio Hales;E. Fomalont;I. Gregorio

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我们提出的阿尔马图像的亚毫米连续偏振和光谱指数的原行星环盘HD 163296。在870{\mu}m处的偏振分数在中心芯中被测量为~0.9%,并且通常沿着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盘短轴对齐,但在间隙中变得更加方位角化,在环1和2之间的差距中扭转高达+/-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。870/1300{\mu}m的尘埃光谱指数在中心和内环呈现出最小值,表明这些区域具有较高的光学深度。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。
We present ALMA images of the sub-mm continuum polarisation and spectral index of the protoplanetary ringed disk HD163296. The polarisation fraction at 870{\mu}m 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 870/1300{\mu}m 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.
两个年轻的边缘原恒星盘的 ALMA 尘埃偏振观测
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