Evaluation of Internal Coronagraphic Techniques for a Segmented Space Telescope

Details Evaluation of Internal Coronagraphic Techniques for a Segmented Space Telescope Evaluation of Internal Coronagraphic Techniques for a Segmented Space Telescope

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21345004s&link_type=abstract

American Astronomical Society, AAS Meeting #213, #450.04; Bulletin of the American Astronomical Society, Vol. 41, p.343

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As part of the ATLAST mission concept study, we are evaluating a variety of coronagraphic techniques for use on a segmented, on-axis 16 meter space telescope in order to detect and characterize terrestrial exoplanets at visible wavelengths. The segment gaps and obscurations caused by the secondary mirror and support structures create significant and complex diffraction structures in the image that make planet characterization difficult. The complex aperture precludes the use of most coronagraphic methods given the contrast and resolution requirements. We find that the visible nuller, which operates interferometrically on the telescope pupil, theoretically provides the necessary performance for an ideal telescope. We will discuss its pros and cons in its application to the ATLAST system.

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