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arXiv 1607.08586astro-ph.IM
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利用毫秒焦面和光瞳面遥测进行系外行星成像的经验格林函数方法

Empirical Green's Function Approach for Utilizing Millisecond Focal and Pupil Plane Telemetry in Exoplanet Imaging

Richard A. Frazin

摘要:

由于新一代近红外探测器阵列具有亚电子噪声,能够达到kHz的读出速率,毫秒焦平面遥测现在变得实用。将这些数据与波前传感系统同时提供的数据相结合,可以自洽地确定光学像差(准静态散斑的原因)和行星图像。这种方法对于发现距离恒星3 $λ/ D$以内的行星特别有利,因为差分成像是无效的。正如作者最近的一篇文章所示(J. Opt. Soc. Am.一、33,712,2016),必须考虑光学系统的几个非共轭平面中的未知像差,这又需要在这些平面之间计算传播场的能力。这些计算很可能难以实现并且昂贵。在这里,提供了一个更方便的替代方案的基础上经验格林函数。它表明,经验格林函数(EGF),占所有多平面,非共同路径的像差,并导致在一个更容易处理和高度并行的计算问题。它还表明,EGF可以推广到治疗偏振,从而在经验格林张量(EGT)。

英文摘要:

Millisecond focal plane telemetry is now becoming practical due to a new generation of near-IR detector arrays with sub-electron noise that are capable of kHz readout rates. Combining these data with those simultaneously available from the wavefront sensing system allows the possibility of self-consistently determining the optical aberrations (the cause of quasi-static speckles) and the planetary image. This approach may be especially advantageous for finding planets within about 3 $λ/ D$ of the star where differential imaging is ineffective. As shown in a recent article by the author (J. Opt. Soc. Am. A., 33, 712, 2016), one must account for unknown aberrations in several non-conjugate planes of the optical system, which, in turn, requires ability to computational propagate the field between these planes. These computations are likely to be difficult to implement and expensive. Here, a far more convenient alternative based on empirical Green's functions is provided. It is shown that the empirical Green's function (EGF), which accounts for all multi-planar, non-common path aberrations, and results in a much more tractable and highly parallel computational problem. It is also shown that the EGF can be generalized to treat polarization, resulting in the empirical Green's tensor (EGT).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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