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Ground-based coronagraphy with high-order adaptive optics

Makidon, Russell B. and Sivaramakrishnan, Anand and Koresko, Christopher D. and Berkefeld, Thomas and Kuchner, Marc J. and Winsor, Robert (2000) Ground-based coronagraphy with high-order adaptive optics. In: Adaptive Optical Systems Technology. Proceedings of SPIE. No.4007. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 399-408. ISBN 9780819436320.

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We simulate the actions of a coronagraph matched to diffraction-limited adaptive optics (AO) systems on the Calypso 1.2 m, Palomar Hale 5 m and Gemini 8.1 m telescopes, and identify useful parameter ranges for AO coronagraphy on these systems. We model the action of adaptive wavefront correction with a tapered, high-pass filter in spatial frequency rather than a hard low frequency cutoff, and estimate the minimum number of AO channels required to produce sufficient image quality for coronagraphic suppression within a few diffraction widths of a central bright object (as is relevant to e.g., brown dwarf searches near late-type dwarf stars). We explore the effect of varying the occulting image- plane stop size and shape, and examine the trade-off between throughput and suppression of the image halo and Airy rings. We discuss our simulations in the context of results from the 241-channel Palomar Hale AO coronagraph system, and suggest approaches for future AO coronagraphic instruments on large telescopes.

Item Type:Book Section
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Kuchner, Marc J.0000-0002-2387-5489
Additional Information:© 2000 Society of Photo-Optical Instrumentation Engineers (SPIE). We thank T. Nakajima and S. R. Kulkarni for stimulating discussion, and B. R. Oppenheimer for pre-publication results and insightful comments. We also thank J. R. P. Angel for bringing high order AO to our attention as an important component of the next step in coronagraphy. Thanks are also due to R. L. White and E. P. Nelan for encouraging this study. We acknowledge the STScI Director's Discretionary Research Fund for support of RBM and travel support for AS, and the STScI Visitors' Program for travel support for CDK.
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Space Telescope Science InstituteUNSPECIFIED
Subject Keywords:diffraction-limited imaging, coronagraphy, adaptive optics, high dynamic range imaging
Series Name:Proceedings of SPIE
Issue or Number:4007
Record Number:CaltechAUTHORS:20181204-132723759
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Official Citation:Russell B. Makidon, Anand Sivaramakrishnan, Christopher D. Koresko, Thomas Berkefeld, Marc J. Kuchner, Robert S. Winsor, "Ground-based coronagraphy with high-order adaptive optics," Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 July 2000); doi: 10.1117/12.390396
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91465
Deposited By: George Porter
Deposited On:06 Dec 2018 00:07
Last Modified:16 Nov 2021 03:41

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