Picture β星盘精细结构的VLT/NACO日冕观测
VLT/NACO coronagraphic observations of fine structures in the disk of beta Pictoris
摘要：
我们目前的地面观测的磁盘周围的A型恒星$β$风景如画的内部磁盘形态进行仔细检查。图像收集与NACO，AO辅助近红外仪器的VLT（ESO），其中包括两种类型的日冕仪：经典的Lyot掩模和相位掩模。在这个程序中，我们利用了两种类型的日冕仪在两个光谱带，H波段的Lyot掩模和KS波段的相位掩模。此外，我们模拟了一个扩展的对象，以了解日冕图像去卷积的局限性。缩小的日冕图像使我们能够仔细测量碎片盘的结构，并揭示了一些以前没有报道过的不对称性（位置，高度和翘曲厚度）。在这个程序中，由于相位掩模的作用，星周物质在0.7”（$13.5 $ AU）附近可见，而Lyot掩模产生的伪影妨碍了对距离小于1.2”（$23.2 $ AU）的尘埃的探测。点源探测极限相比，最近发表的观测行星候选人。最后，模拟表明，日冕数据的反卷积可能确实会在磁盘的图像中产生人工图案。
英文摘要：
We present ground-based observations of the disk around the A-type star $β$ Pictoris to perform a close inspection of the inner disk morphology. Images were collected with NACO, the AO-assisted near-IR instrument on the VLT (ESO) which includes two types of coronagraphs: classical Lyot masks and phase masks. In this program we took advantage of both types of coronagraphs in two spectral bands, H-band for the Lyot mask and Ks-band for the phase mask. In addition, we simulated an extended object to understand the limitations in deconvolution of coronagraphic images. The reduced coronagraphic images allow us to carefully measure the structures of the debris disk and reveal a number of asymmetries of which some were not reported before (position, elevation and thickness of the warp). In this program, the circumstellar material is visible as close as 0.7" ($13.5 $AU) owing to the phase mask while the Lyot mask generates artifacts which hamper the detection of the dust at separations closer than 1.2" ($23.2 $AU). The point source detection limit is compared to recently published observations of a planet candidate. Finally, the simulations show that deconvolution of coronagraphic data may indeed produce artificial patterns within the image of a disk.
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