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Proceedings Paper

Adaptive phase-mask coronagraph with amplitude and phase modulation for high dynamic range synchronous detection: APM2 coronagraph
Author(s): P. Bourget; D. Mawet; P. Mardones; N. Schuhler; L. Pueyo; J. Girard; P. Haguenauer; F. Gonte
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Paper Abstract

We present a new Adaptive Phase Mask (APM) coronagraph design enabling Amplitude and Phase Modulation control (APM). The Adaptive Phase mask coronagraph is a technique proposed to provide both high dynamic and high angular resolution imaging of faint sources around bright objects. Discriminating faint sources from static speckles is a challenging problem. Our new system is based on synchronous demodulation that allows high dynamic range detection of a faint target immersed in a background. The APM2 uses the coherence of speckles to discriminate them from proper companions, using the mask itself as the electric field modulator. Synchronous detection in the radio frequency range is used to side-step the effect of atmospheric turbulence and enable the detection of low amplitude signals. The APM2 concept offers high dynamic range detection and provides a time- and cost-effective method to quantify the probability of presence of a faint object close to the central star.

Paper Details

Date Published: 26 September 2013
PDF: 8 pages
Proc. SPIE 8864, Techniques and Instrumentation for Detection of Exoplanets VI, 88640J (26 September 2013); doi: 10.1117/12.2026211
Show Author Affiliations
P. Bourget, European Southern Observatory (Chile)
D. Mawet, European Southern Observatory (Chile)
P. Mardones, European Southern Observatory (Chile)
N. Schuhler, European Southern Observatory (Chile)
L. Pueyo, Space Telescope Science Institute (United States)
J. Girard, European Southern Observatory (Chile)
P. Haguenauer, European Southern Observatory (Chile)
F. Gonte, European Southern Observatory (Chile)

Published in SPIE Proceedings Vol. 8864:
Techniques and Instrumentation for Detection of Exoplanets VI
Stuart Shaklan, Editor(s)

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