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Proceedings Paper

Exoplanet detection with simultaneous spectral differential imaging: effects of out-of-pupil-plane optical aberrations
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Paper Abstract

Imaging faint companions (exoplanets and brown dwarfs) around nearby stars is currently limited by speckle noise. To efficiently attenuate this noise, a technique called simultaneous spectral differential imaging (SSDI) can be used. This technique consists of acquiring simultaneously images of the field of view in several adjacent narrow bands and in combining these images to suppress speckles. Simulations predict that SSDI can achieve, with the acquisition of three wavelengths, speckle noise attenuation of several thousands. These simulations are usually performed using the Fraunhofer approximation, i.e. considering that all aberrations are located in the pupil plane. We have performed wavefront propagation simulations to evaluate how out-of-pupil-plane aberrations affect SSDI speckle noise attenuation performance. The Talbot formalism is used to give a physical insight of the problem; results are confirmed using a proper wavefront propagation algorithm. We will show that near-focal-plane aberrations can significantly reduce SSDI speckle noise attenuation performance at several λ/D separation. It is also shown that the Talbot effect correctly predicts the PSF chromaticity. Both differential atmospheric refraction effects and the use of a coronagraph will be discussed.

Paper Details

Date Published: 29 June 2006
PDF: 11 pages
Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 62693M (29 June 2006); doi: 10.1117/12.672263
Show Author Affiliations
Christian Marois, Lawrence Livermore National Lab. (United States)
Don W. Phillion, Lawrence Livermore National Lab. (United States)
Bruce Macintosh, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 6269:
Ground-based and Airborne Instrumentation for Astronomy
Ian S. McLean; Masanori Iye, Editor(s)

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