关于GG Tau环的分层尘埃分布
On the stratified dust distribution of the GG Tau circumbinary ring
摘要：
我们的目标是研究双星系统GG Tau的环星环中的垂直尘埃分布，并寻找分层的证据，这是预计在行星形成过程中发生的第一步。我们提出了一个同时分析的四个散射光图像的波长范围从800 nm到3800 nm，并将它们与（i）的垂直尘埃分层的参数处方，和（ii）与SPH双流体流体动力学计算的结果。层结的参数处方和流体动力学计算都很好地再现了观测到的亮度轮廓。这些模型也提供了一个正确的匹配所观察到的星/环综合通量比。另一种解决方案是混合良好，但“异国情调”，尘埃大小分布也符合亮度轮廓比，但未能匹配恒星/环通量比。这些结果支持了GG Tau环中尘埃垂直分层的存在，并进一步预测了径向分层的存在。
英文摘要：
Our objective is to study the vertical dust distribution in the circumbinary ring of the binary system GG Tau and to search for evidence of stratification, one of the first steps expected to occur during planet formation. We present a simultaneous analysis of four scattered light images spanning a range of wavelength from 800 nm to 3800 nm and compare them with (i) a parametric prescription for the vertical dust stratification, and (ii) with the results of SPH bi-fluid hydrodynamic calculations. The parametric prescription and hydrodynamical calculations of stratification both reproduce the observed brightness profiles well. These models also provide a correct match for the observed star/ring integrated flux ratio. Another solution with a well-mixed, but ``exotic'', dust size distribution also matches the brightness profile ratios but fails to match the star/ring flux ratio. These results give support to the presence of vertical stratification of the dust in the ring of GG Tau and further predict the presence of a radial stratification also.
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