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07 February 2025
 
  » arxiv » astro-ph/0412179

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Exoplanets imaging with a Phase-Induced Amplitude Apodization Coronagraph - I. Principle
Olivier Guyon ; Eugene A. Pluzhnik ; Raphael Galicher ; Frantz Martinache ; Stephen T. Ridgway ; Robert A. Woodruff ;
Date 8 Dec 2004
Journal Astrophys.J. 622 (2005) 744
Subject astro-ph
AffiliationSubaru Telescope), Stephen T. Ridgway (NOAO), Robert A. Woodruff (Lockheed Martin Space Corporation
AbstractUsing 2 aspheric mirrors, it is possible to apodize a telescope beam without losing light or angular resolution: the output beam is produced by ``remapping’’ the entrance beam to produce the desired light intensity distribution in a new pupil. We present the Phase-Induced Amplitude Apodization Coronagraph (PIAAC) concept, which uses this technique, and we show that it allows efficient direct imaging of extrasolar terrestrial planets with a small-size telescope in space. The suitability of the PIAAC for exoplanet imaging is due to a unique combination of achromaticity, small inner working angle (about 1.5 $lambda/d$), high throughput, high angular resolution and large field of view. 3D geometrical raytracing is used to investigate the off-axis aberrations of PIAAC configurations, and show that a field of view of more than 100 $lambda/d$ in radius is available thanks to the correcting optics of the PIAAC. Angular diameter of the star and tip-tilt errors can be compensated for by slightly increasing the size of the occulting mask in the focal plane, with minimal impact on the system performance. Earth-size planets at 10 pc can be detected in less than 30s with a 4m telescope. Wavefront quality requirements are similar to classical techniques.
Source arXiv, astro-ph/0412179
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