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Proceedings Paper

Dynamic distortion calibration using a diffracting pupil: high precision astrometry laboratory demonstration for exoplanet detection
Author(s): Eduardo A. Bendek; S. Mark Ammons; Harish Shankar; Olivier Guyon
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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 50um 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 is being developed to demonstrate the capabilities of this diffractive pupil concept. The researchers aim to achieve 10 μas single-axis precision in the laboratory, simulating 0.14 μas precision on a 1.4 m space telescope. This paper describes this laboratory and presents the data and results obtained so far.

Paper Details

Date Published: 15 September 2011
PDF: 12 pages
Proc. SPIE 8151, Techniques and Instrumentation for Detection of Exoplanets V, 81510U (15 September 2011); doi: 10.1117/12.893130
Show Author Affiliations
Eduardo A. Bendek, The Univ. of Arizona, Steward Observatory (United States)
S. Mark Ammons, Lawrence Livermore National Lab. (United States)
Harish Shankar, The Univ. of Arizona, Steward Observatory (United States)
Olivier Guyon, The Univ. of Arizona, Steward Observatory (United States)

Published in SPIE Proceedings Vol. 8151:
Techniques and Instrumentation for Detection of Exoplanets V
Stuart Shaklan, Editor(s)

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