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Proceedings Paper

New strategies for an extremely large telescope dedicated to extremely high contrast: the Colossus project
Author(s): Gil Moretto; Jeff R. Kuhn; Eric Thiébaut; Maud Langlois; Svetlana V. Berdyugina; Caisey Harlingten; David Halliday
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Paper Abstract

Detecting an exoplanetary life signal is extremely challenging with current technology because it requires a sensitive telescope and instrument that can measure the planet's reflected optical and infrared light, while distinguishing this from the star's scattered light and the terrestrial thermal noise background. This requires highly accurate adaptive optics, a coronagraph system, and a specially designed and aligned giant telescope. We present here new strategies for building such a telescope with large circular segments using adaptive optics correction independently for each of these segments prior to cophasing the segments. The foreseen cophasing technique uses focal plane images that allow piston measurements and correction between all the segments. In this context we propose to derive the segment phase error using the inverse approach knowing the segment positions and the single aperture Airy function.

Paper Details

Date Published: 22 July 2014
PDF: 9 pages
Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91451L (22 July 2014); doi: 10.1117/12.2055797
Show Author Affiliations
Gil Moretto, Institut de Physique Nucléaire de Lyon (France)
Jeff R. Kuhn, Institute for Astronomy, Univ. of Hawai'i (United States)
Eric Thiébaut, Ctr. de Recherche Astrophysique de Lyon, CNRS, Observatoire de Lyon (France)
Maud Langlois, Ctr. de Recherche Astrophysique de Lyon, CNRS, Observatoire de Lyon (France)
Svetlana V. Berdyugina, Kiepenheuer-Institut für Sonnenphysik (Germany)
NASA Astrobiology Institute, Univ. of Hawaii (United States)
Caisey Harlingten, Innovative Optics Ltd. (Canada)
David Halliday, Innovative Optics Ltd. (Canada)

Published in SPIE Proceedings Vol. 9145:
Ground-based and Airborne Telescopes V
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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