Speckle correction in polychromatic light with the self-coherent camera for the direct detection of exoplanets

J. Mazoyer; R. Galicher; P. Baudoz; G. Rousset

doi:10.1117/12.2023508

26 September 2013 Speckle correction in polychromatic light with the self-coherent camera for the direct detection of exoplanets

J. Mazoyer, R. Galicher, P. Baudoz, G. Rousset

Author Affiliations +

Proceedings Volume 8864, Techniques and Instrumentation for Detection of Exoplanets VI; 88640N (2013) https://doi.org/10.1117/12.2023508
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

Direct detection is a very promising field in exoplanet science. It allows the detection of companions with large separation and allows their spectral analysis. A few planets have already been detected and are under spectral analysis. But the full spectral characterization of smaller and colder planets requires higher contrast levels over large spectral bandwidths. Coronagraphs can be used to reach these contrasts, but their efficiency is limited by wavefront aberrations. These deformations induce speckles, star lights leaks, in the focal plane after the coronagraph. The wavefront aberrations should be estimated directly in the science image to avoid usual limitations by differential aberrations in classical adaptive optics. In this context, we introduce the Self- Coherent Camera (SCC). The SCC uses the coherence of the star light to produce a spatial modulation of the speckles in the focal plane and estimate the associated electric complex field. Controlling the wavefront with a deformable mirror, high contrasts have already been reached in monochromatic light with this technique. The performance of the current version of the SCC is limited when widening the spectral bandwidth. We will present a theoretical analysis of these issues and their possible solution. Finally, we will present test bench performance in polychromatic light.

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J. Mazoyer, R. Galicher, P. Baudoz, and G. Rousset "Speckle correction in polychromatic light with the self-coherent camera for the direct detection of exoplanets", Proc. SPIE 8864, Techniques and Instrumentation for Detection of Exoplanets VI, 88640N (26 September 2013); https://doi.org/10.1117/12.2023508

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KEYWORDS

Coronagraphy

Exoplanets

Fourier transforms

Planets

Actuators

Cameras

Point spread functions

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