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Proceedings Paper

Whack-a-speckle: focal plane wavefront sensing in theory and practice with a deformable secondary mirror and 5-micron camera
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Paper Abstract

Long exposures from adaptive optic systems show a diffraction limited core superimposed on a halo of uncorrected light from a science target, and the addition of various long-lived speckles that arise from uncorrected aberrations in the telescope system. The presence of these speckles limit the detection of extra-solar planets at a few diffraction widths from the primary source. Focal plane wavefront sensing uses the deformable secondary mirror of the MMT adaptive optics system to systematically remove the presence of long-lived speckles in a high-contrast image, and also test for the incoherent source that represents a separate astronomical target nearby. We use the Clio 5 micron camera (with its coronagraphic capabilities) to modulate long lived speckles and present initial on-sky results of this technique.

Paper Details

Date Published: 28 June 2006
PDF: 7 pages
Proc. SPIE 6272, Advances in Adaptive Optics II, 62723B (28 June 2006); doi: 10.1117/12.672577
Show Author Affiliations
Matthew A. Kenworthy, Steward Observatory (United States)
Philip M. Hinz, Steward Observatory (United States)
J. Roger P. Angel, Steward Observatory (United States)
Ari N. Heinze, Steward Observatory (United States)
Suresh Sivanandam, Steward Observatory (United States)

Published in SPIE Proceedings Vol. 6272:
Advances in Adaptive Optics II
Brent L. Ellerbroek; Domenico Bonaccini Calia, Editor(s)

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