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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Detailed structure of the outer disk around HD169142 with polarized light in H-band
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Detailed structure of the outer disk around HD169142 with polarized light in H-band

机译：H波段偏振光围绕HD169142的外盘的详细结构

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摘要

Coronagraphic imagery of the circumstellar disk around HD 169142 in H-band polarized intensity (PI) with Subaru/HiCIAO is presented. The emission scattered by dust particles at the disk surface in 0".2 <= r <= 1".2, or 29 <= r <= 174 AU, is successfully detected. The azimuthally-averaged radial profile of the PI shows a double power-law distribution, in which the PIs in r=29-52 AU and r=81.2-145 AU respectively show r(-3)-dependence. These two power-law regions are connected smoothly with a transition zone (TZ), exhibiting an apparent gap in r=40-70 AU. The PI in the inner power-law region shows a deep minimum whose location seems to coincide with the point source at lambda = 7 mm. This can be regarded as another sign of a protoplanet in TZ. The observed radial profile of the PI is reproduced by a minimally flaring disk with an irregular surface density distribution or with an irregular temperature distribution or with the combination of both. The depletion factor of surface density in the inner power-law region (r<50 AU) is derived to be >= 0.16 from a simple model calculation. The obtained PI image also shows small scale asymmetries in the outer power-law region. Possible origins for these asymmetries include corrugation of the scattering surface in the outer region, and shadowing effect by a puffed up structure in the inner power-law region.
机译：呈现了Subaru / HiCIAO在H波段极化强度（PI）下HD 169142周围的星际盘的日冕图像。成功检测到磁盘表面上的灰尘颗粒散射的发射为0“ .2 <= r <= 1” .2或29 <= r <= 174 AU。 PI的方位角平均径向轮廓显示出双幂律分布，其中r = 29-52 AU和r = 81.2-145 AU中的PI分别显示r（-3）依赖性。这两个幂律区域与过渡区（TZ）平滑连接，在r = 40-70 AU中表现出明显的间隙。内部幂律区域中的PI显示一个很深的最小值，其位置似乎与λ= 7 mm处的点源重合。这可以看作是TZ中原行星的另一个标志。观察到的PI的径向轮廓通过具有不规则表面密度分布或不规则温度分布或两者结合的最小张开的圆盘复制。根据简单的模型计算，内部幂律区域（r <50 AU）中表面密度的损耗因子> 0.16。所获得的PI图像还在外部幂律区域中显示出小比例的不对称性。这些不对称性的可能起因包括外部区域的散射表面起皱，以及内部幂律区域中起皱结构的阴影效应。

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