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Super-Gaussian apodization in ground based telescopes for high contrast coronagraph imaging

Abstract: We introduce the use of Super-Gaussian apodizing functions in the telescope pupil plane and/or the coronagraph Lyot plane to improve the imaging contrast in ground-based coronagraphs. We describe the properties of the Super-Gaussian function, we estimate its second-order moment in the pupil and Fourier planes and we check it as an apodizing function. We then use Super-Gaussian function to apodize the telescope pupil, the coronagraph Lyot plane or both of them. The result is that a proper apodizing masks combination can reduce the exoplanet detection distance up to a 45% with respect to the classic Lyot coronagraph, for moderately aberrated wavefronts. Compared to the prolate spheroidal function the Super-Gaussian apodizing function allows the planet light up to 3 times brighter. An extra help to increase the extinction rate is to perform a frame selection (Lucky Imaging technique). We show that a selection of the 10% best frames will reduce up to a 20% the detection angular distance when using the classic Lyot coronagraph but that the reduction is only around the 5% when using an apodized coronagraph.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Cagigas M.A., Valle P.J., Cagigal M.P.,

 Fuente: Optics Express, 2013, 21(10), 12744-12756

Editorial: The Optical Society (OSA)

 Fecha de publicación: 16/05/2013

Nº de páginas: 13

Tipo de publicación: Artículo de Revista

 DOI: 10.1364/OE.21.012744

ISSN: 1094-4087

Proyecto español: FIS2012-31079.

Url de la publicación: https://doit.org/10.1364/OE.21.012744