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Proceedings Paper

High-precision astrometry laboratory demonstration for exoplanet detection using a diffractive pupil telescope
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Paper Abstract

Detection of earth-size exoplanets using the astrometric signal of the host star requires sub microarcsecond measurement precision. One major challenge in achieving this precision using a medium-size (<2-m) space telescope is the calibration of dynamic distortions. The researchers propose a diffractive pupil technique that uses an array of approximately 5um dots on the primary mirror that generate polychromatic diffraction spikes in the focal plane. The diffraction spikes encode optical distortions in the optical system and may be used to calibrate astrometric measurements. This concept can be used simultaneously with coronagraphy for exhaustive characterization of exoplanets (mass, spectra, orbit). At the University of Arizona, a high precision astrometry laboratory was developed to demonstrate the capabilities of this diffractive pupil concept. The researchers aim to demonstrate that the diffractive pupil can improve current limiting factors of astrometric accuracy. This paper describes this laboratory and the results showing that this technique can effectively calibrate dynamic distortions.

Paper Details

Date Published: 21 September 2012
PDF: 13 pages
Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 844243 (21 September 2012); doi: 10.1117/12.926740
Show Author Affiliations
Eduardo A Bendek, Steward Observatory, The Univ. of Arizona (United States)
S. Mark Ammons, Lawrence Livermore National Lab. (United States)
Ruslan Belikov, NASA Ames Research Ctr. (United States)
Eugene Pluzhnik, NASA Ames Research Ctr. (United States)
Olivier Guyon, Steward Observatory, The Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 8442:
Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave
Mark C. Clampin; Giovanni G. Fazio; Howard A. MacEwen; Jacobus M. Oschmann, Editor(s)

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