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Scintillation and pupil illumination in AO coronagraphy

Published online by Cambridge University Press:  02 May 2006

Anand Sivaramakrishnan ,
B. R. Oppenheimer ,
M. D. Perrin ,
L. C. Roberts ,
R. B. Makidon ,
R. Soummer ,
A. P. Digby ,
L. W. Bradford ,
M. A. Skinner  and
N. H. Turner
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Anand Sivaramakrishnan
Affiliation:
Department of Astronomy, American Museum of Natural History, 79th Street at Central Park West, New York NY 10024, USA NSF Center for Adaptive Optics
B. R. Oppenheimer
Affiliation:
Department of Astronomy, American Museum of Natural History, 79th Street at Central Park West, New York NY 10024, USA
M. D. Perrin
Affiliation:
Astronomy Department, University of California, Berkelely CA 94000, USA NSF Center for Adaptive Optics
L. C. Roberts
Affiliation:
The Boeing Company, 535 Lipoa Pkwy, Suite 200, Kihei, HI 96753, USA
R. B. Makidon
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, MD 21218, USA NSF Center for Adaptive Optics
R. Soummer
Affiliation:
Department of Astronomy, American Museum of Natural History, 79th Street at Central Park West, New York NY 10024, USA NSF Center for Adaptive Optics
A. P. Digby
Affiliation:
Department of Astronomy, American Museum of Natural History, 79th Street at Central Park West, New York NY 10024, USA
L. W. Bradford
Affiliation:
The Boeing Company, 535 Lipoa Pkwy, Suite 200, Kihei, HI 96753, USA
M. A. Skinner
Affiliation:
The Boeing Company, 535 Lipoa Pkwy, Suite 200, Kihei, HI 96753, USA
N. H. Turner
Affiliation:
Center for High Angular Resolution Astronomy, Georgia State University Mt. Wilson CA 91023, USA
T. A. ten Brummelaar
Affiliation:
Center for High Angular Resolution Astronomy, Georgia State University Mt. Wilson CA 91023, USA
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Abstract

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The Lyot Project near-infrared JHK coronagraph achieved first light on the Advanced Electro-Optical System (AEOS) in March 2004. Optical pupil plane imaging at video rates from this coronagraph provides data on atmospheric scintillation and quasi-static pupil intensity variations. We examine the effect of these variations on coronagraphic performance. Early simulations suggested Strehl ratio reductions of the order of 2–3% due to residual uncorrected phase aberrations in H-band. We find that static or quasi-static pupil illumination non-uniformity in I-band reduces Strehl by $\sim$2%. A lower bound on the effects of dynamic illumination variation over the pupil is also $\sim$2% in I-band. Some of the static intensity variations in the pupil are due to pinned deformable mirror (DM) actuators. We simulate the effects a pinned actuator has on the coronagraph. The resultant speckles in simulated coronagraphic images show similarities to some Lyot Project PSFs. This highlights the importance of knowledge of the pupil in next-generation extreme AO coronagraphs in order to realize the predicted photometric dynamic range of their images.

Keywords

instrumentation: adaptive opticsplanetary systems: protoplanetary disks
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C200: Direct Imaging of Exoplanets: Science & Techniques , October 2005 , pp. 613 - 616
Copyright
© 2006 International Astronomical Union