6 August 2010 Telling planets from speckles created by telescope segmentation
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Abstract
Segmentation of telescope's primary mirror creates quasi-static speckles in an image. These speckles are impediment for the detection of faint structures around stars, for instance exoplanets. An elaborated postprocessing method is required to improve the detection level. The Stochastic Speckle Discrimination (SSD) method developed for this purpose uses statistical variability of intensity to distinguish between planets and speckles. To calculate the efficiency of SSD we derive analytical expressions for mean and standard deviation of point spread function (PSF) produced by segmented pupil. The expressions are general for any point in the image plane, but there is a difference in statistical behavior for the central point and for the off-axis point. In particular we show that a modified Rician distribution is inapplicable to describe on-axis intensity. In the last section we calculate the level of primary mirror phasing required for the efficient use of SSD.
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Natalia Yaitskova, Natalia Yaitskova, Szymon Gladysz, Szymon Gladysz, } "Telling planets from speckles created by telescope segmentation", Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 773351 (6 August 2010); doi: 10.1117/12.856112; https://doi.org/10.1117/12.856112
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