We present H- and K s-band polarized differential images of the Herbig Ae/Be star HD142527, revealing its optically thick outer disk and the nearly empty gap. The very small inner working angle (~01) and high-resolution achievable with an 8?m class telescope, together with a careful polarimetric calibration strategy, allow us to achieve images that surpass the quality of previous scattered-light images. Previously known substructures are resolved more clearly and new structures are seen. Specifically, we are able to resolve (1) half a dozen spiral structures in the disk, including previously known outer-disk spirals as well as new spiral arms and arcs close to the inner rim of the disk, (2) peculiar holes in the polarized surface brightness at position angles (P.A.'s) of ~0° and ~160°, (3) the inner rim on the eastern side of the disk, and (4) the gap between the outer and inner disk, ranging from the inner working angle of 01 out to between 07 and 10, which is nearly devoid of dust. We then use a Markov Chain Monte Carlo algorithm to determine several structural parameters of the disk, using very simple assumptions, including its inclination, eccentricity, and the scale height of the inner rim. We compare our results with previous work on this object and try to produce a consistent picture of the system and its transition disk.
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机译：我们展示了Herbig Ae / Be星HD142527的H和K s波段偏振差分图像，揭示了其光学上较厚的外盘和几乎空的间隙。内窥镜非常小的内工作角（〜01）和8 µm类望远镜可实现的高分辨率，加上精心的偏振校准策略，使我们能够获得超越先前散射光图像质量的图像。以前已知的子结构可以更清晰地解析，并且可以看到新的结构。具体而言，我们能够解析（1）磁盘中的六个螺旋结构，包括先前已知的磁盘外螺旋以及靠近磁盘内缘的新螺旋臂和弧，（2）磁盘中的特殊孔位置角（PA's）为〜0°和〜160°时的偏振表面亮度;（3）圆盘东侧的内缘;（4）内圆盘和内圆盘之间的间隙，范围从内部工作角度为01到07至10之间，几乎没有灰尘。然后，我们使用Markov Chain Monte Carlo算法，使用非常简单的假设（包括其倾角，偏心率和内轮缘的刻度高度）来确定磁盘的几个结构参数。我们将我们的结果与该对象上的先前工作进行比较，并尝试对系统及其过渡磁盘产生一致的印象。
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