Image analysis with speckles altered by a deformable mirror

Elizabeth J. Young; N. Jeremy Kasdin; Alexis Carlotti

doi:10.1117/12.2025061

26 September 2013 Image analysis with speckles altered by a deformable mirror

Elizabeth J. Young, N. Jeremy Kasdin, Alexis Carlotti

Proceedings Volume 8864, Techniques and Instrumentation for Detection of Exoplanets VI; 88640S (2013) https://doi.org/10.1117/12.2025061
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

Quasi-static speckles are one of the main limitations in imaging exoplanets, since the image of a planet looks similar to a speckle. However, speckles are light from the same coherent source, the star, and incoherent with the planet. By moving the deformable mirror after each image, the speckle pattern as seen on the camera changes between images. The change is very small within the full width half max of the planet, so changes in the planet image are minimal. This fundamental coherence property of the speckles (and incoherence with the planet light) guides us to develop a planet detection method to distinguish a planet from a speckle by taking advantage of a changing speckle pattern. We present a planet detection algorithm using a Bayesian analysis. We seek to conduct a hypothesis test at each pixel in the image to detect the presence of a planet at that location. We formulate a test statistic and use a least-squares method to estimate the unknown parameters. These parameters are the intensities of a planet and a locally constant background. Our algorithm assumes the speckle pattern is independent from one image to another. This approach is used to formulate an integration time estimate for detection of a planet with specified probabilities of false alarms and missed detections. A comparison is made between a single stacked image and using multiple images.

Citation Download Citation

Elizabeth J. Young, N. Jeremy Kasdin, and Alexis Carlotti "Image analysis with speckles altered by a deformable mirror", Proc. SPIE 8864, Techniques and Instrumentation for Detection of Exoplanets VI, 88640S (26 September 2013); https://doi.org/10.1117/12.2025061

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