切趾光瞳Lyot Coronaginal无Lyot停止工作
Apodized Pupil Lyot Coronagraph Working Without Lyot Stop
摘要：
在高对比度成像的背景下，我们建议评估在没有Lyot Stop的情况下工作的变迹瞳孔Lyot Coronagulum（APLC）的性能，即Stop-less Lyot Coronagulum（SLLC）。这种日冕镜是入射光瞳切趾器和焦平面上的不透明掩模的组合。然而，与APLC相反，SLLC是通过传统的瞳孔停止来截肢的。我们的目标是强调使用这种日冕仪解决方案的兴趣，特别是对于那些不可能引入带有Lyot停止的恒星日冕仪的仪器。我们估计与SLLC实现的强度衰减，并进行我们的研究，重点放在大加那利望远镜（GTC）的情况下。在第一步中，数值模拟假设没有任何像差，此后SLLC性能评估考虑AO校正波前在我们的方法为地基仪器。SLLC的性能被证明是等效的APLC在存在AO补偿大气湍流图像，其中斯特列尔比为S=0.552，在波长λ =1.57 μ m。这种日冕可以消除恒星图像的峰值强度，从而避免探测器饱和。此外，它有助于增加图像动态范围。平均对比度增益在恒星星等三角洲m=0.23获得SLLC，而APLC达到一个值三角洲m=0.38。
英文摘要：
In the context of high contrast imaging, we propose to evaluate the performance of the Apodized Pupil Lyot Coronagraph (APLC) working without Lyot Stop, namely Stop-less Lyot Coronagraph (SLLC). This coronagraph is a combination of an entrance pupil apodizer and an opaque mask in the following focal plane. However, contrary to APLC, SLLC is amputated by the traditional pupil stop. Our goal is to stress the interest of using this coronagraphic solution, in particular for instruments for which the introduction of a stellar coronagraph with Lyot stop is made impossible. We estimate the intensity attenuation achieved with SLLC and carry out our study with a focus on the case of Gran Telescopio Canarias (GTC). In a first step, numerical simulations are made assuming the absence of any aberration, thereafter SLLC performance is evaluated considering AO corrected wavefronts in our approach for ground-based instruments. SLLC performance proves to be equivalent to that obtained with APLC in presence of AO compensated atmospheric turbulence images, which Strehl ratio is S=0.552 at the wavelength lambda=1.57 mu m. This coronagraph allows to remove the peak intensity of a star image and therefore, avoid detector saturation. Moreover, it helps increasing the image dynamic range. A mean contrast gain in stellar magnitudes Delta m=0.23 is obtained with SLLC whereas APLC reaches a value Delta m=0.38.
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