S4：一种用于相干斑抑制的空间-谱模型
S4: A Spatial-Spectral model for Speckle Suppression
摘要：
高动态范围成像仪的目标是阻挡或零化来自非常明亮的主星的光，以便能够检测和测量远暗的伴星;在实际系统中，一小部分主星光被散射，衍射和未被遮蔽。我们介绍了S4，一个灵活的数据驱动模型的P1640光谱日冕仪中的未掩蔽（和高度斑点）的光。该模型使用主成分分析（PCA）来捕获散斑的空间结构和波长依赖性，但不捕获任何同伴产生的信号。因此，残差通常包括伴随信号。因此，可以通过用固定的伴随模型对该误差信号进行滤波来找到伴随。这种方法对亮度为散斑亮度的百分之一，或者亮度高达主星亮度的$10^{-7}$倍的伴星很敏感。这优于现有方法的2-3倍，接近散粒噪声的物理极限。
英文摘要：
High dynamic-range imagers aim to block out or null light from a very bright primary star to make it possible to detect and measure far fainter companions; in real systems a small fraction of the primary light is scattered, diffracted, and unocculted. We introduce S4, a flexible data-driven model for the unocculted (and highly speckled) light in the P1640 spectroscopic coronograph. The model uses Principal Components Analysis (PCA) to capture the spatial structure and wavelength dependence of the speckles but not the signal produced by any companion. Consequently, the residual typically includes the companion signal. The companion can thus be found by filtering this error signal with a fixed companion model. The approach is sensitive to companions that are of order a percent of the brightness of the speckles, or up to $10^{-7}$ times the brightness of the primary star. This outperforms existing methods by a factor of 2-3 and is close to the shot-noise physical limit.
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。
