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arXiv 2106.06286astro-ph.IMastro-ph.EP
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在Subaru/SCExAO首次进行空间线性暗场控制的空中演示

First on-sky demonstration of spatial Linear Dark Field Control with the vector-Apodizing Phase Plate at Subaru/SCExAO

S. P. Bos, K. L. Miller, J. Lozi, O. Guyon, D. S. Doelman, S. Vievard, A. Sahoo, V. Deo, N. Jovanovic, F. Martinache, T. Currie, F. Snik

摘要:

目前限制系外行星探测高对比度成像观测的关键噪声源之一是准静态散斑。准静态散斑产生于缓慢演化的非共路像差(NCPA)。这项工作的目的是提出一个空间线性暗场控制(LDFC)的概念验证的天空演示。LDFC的最终目标是通过使用科学图像作为附加波前传感器来寻址NCPA来稳定点扩散函数(PSF)。我们将空间LDFC与斯巴鲁望远镜上的斯巴鲁日冕极端自适应光学系统上的非对称瞳孔矢量变迹相位板(APvAPP)相结合。在本文中,我们报告的第一个成功的LDFC的原理验证的天空测试的结果。我们目前的结果从两种类型的情况:(1)仪器误差和大气残差加上人工诱导的静态变形镜上引入的像差和(2)校正只有大气残差和仪器像差。当在DM上引入人工静态波前像差时,我们发现LDFC可以将原始对比度提高$3$ - $7$。在这些测试中,残余波前误差减小了$\sim$ 50 nm RMS,从$\sim$ 90 nm减小到$\sim40$ nm RMS。在只有残留的大气波前误差和仪器像差的情况下,我们表明,LDFC是能够抑制发展的像差,具有时间尺度的$<0.1$ - $0.4$ Hz。我们发现,在$10^{-2}$ Hz的功率减少了$\sim$ 20,7,和4的空间频率箱在2.5,5.5,和8.5 $λ/D$,分别。这项工作中提出的结果表明,LDFC是一种很有前途的技术,可以实现下一代超大望远镜的高对比度成像目标。

英文摘要:

One of the key noise sources that currently limits high-contrast imaging observations for exoplanet detection is quasi-static speckles. Quasi-static speckles originate from slowly evolving non-common path aberrations (NCPA). The purpose of this work is to present a proof-of-concept on-sky demonstration of spatial Linear Dark Field Control (LDFC). The ultimate goal of LDFC is to stabilize the point spread function (PSF) by addressing NCPA using the science image as additional wavefront sensor. We combined spatial LDFC with the Asymmetric Pupil vector-Apodizing Phase Plate (APvAPP) on the Subaru Coronagraphic Extreme Adaptive Optics system at the Subaru Telescope. In this paper, we report the results of the first successful proof-of-principle LDFC on-sky tests. We present results from two types of cases: (1) correction of instrumental errors and atmospheric residuals plus artificially induced static aberrations introduced on the deformable mirror and (2) correction of only atmospheric residuals and instrumental aberrations. When introducing artificial static wavefront aberrations on the DM, we find that LDFC can improve the raw contrast by a factor of $3$--$7$ over the dark hole. In these tests, the residual wavefront error decreased by $\sim$50 nm RMS, from $\sim$90 nm to $\sim40$ nm RMS. In the case with only residual atmospheric wavefront errors and instrumental aberrations, we show that LDFC is able to suppress evolving aberrations that have timescales of $<0.1$--$0.4$ Hz. We find that the power at $10^{-2}$ Hz is reduced by a factor of $\sim$20, 7, and 4 for spatial frequency bins at 2.5, 5.5, and 8.5 $λ/D$, respectively. The results presented in this work show that LDFC is a promising technique for enabling the high-contrast imaging goals of the upcoming generation of extremely large telescopes.

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