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A hybrid Lyot coronagraph for the direct imaging and spectroscopy of exoplanet systems: recent results and prospects

Trauger, John and Moody, Dwight and Gordon, Brian and Krist, John and Mawet, Dimitri (2011) A hybrid Lyot coronagraph for the direct imaging and spectroscopy of exoplanet systems: recent results and prospects. In: Techniques and Instrumentation for Detection of Exoplanets V. Proceedings of SPIE. No.8151. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 81510G. ISBN 978-0-81948-761-2. https://resolver.caltech.edu/CaltechAUTHORS:20150526-084726251

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Abstract

We report our best laboratory contrast demonstrations achieved to date. We review the design, fabrication, performance, and future prospects of a hybrid focal plane occulter for exoplanet coronagraphy. Composed of thickness-profiled metallic and dielectric thin films vacuum deposited on a fused silica substrate, the hybrid occulter uses two superimposed thin films for control over both the real and imaginary parts of the complex attenuation pattern. Together with a deformable mirror for adjustment of wavefront phase, the hybrid Lyot coronagraph potentially exceeds billion-toone contrast over dark fields extending to within angular separations of 3 λ/D from the central star, over spectral bandwidths of 20% or more, and with throughput efficiencies up to 60%. We report laboratory contrasts of 3×10^(-10) over 2% bandwidths, 6×10^(-10) over 10% bandwidths, and 2×10^(-9) over 20% bandwidths, achieved across high contrast fields extending from an inner working angle of 3 λ/D to a radius of 15 λ/D. Occulter performance is analyzed in light of recent experiments and optical models, and prospects for further improvements are summarized. The science capabilities of the hybrid Lyot coronagraph are compared with requirements of the ACCESS mission, a representative exoplanet space telescope concept study for the direct imaging and spectroscopy of exoplanet systems.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1117/12.895032DOIArticle
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1342401PublisherArticle
ORCID:
AuthorORCID
Mawet, Dimitri0000-0002-8895-4735
Additional Information:© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). September 15, 2011. This work has been supported by NASA's Technology Demonstration for Exoplanet Missions (TDEM) program. We acknowledge the support and valuable discussions provided by Brian Kern, Albert Niessner, and the ExEP HCIT infrastructure team during the laboratory demonstrations. The research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
Funders:
Funding AgencyGrant Number
NASA Technology Demostration for Exoplanet Missions (TDEM) programUNSPECIFIED
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:exoplanet, coronagraph, active optics
Series Name:Proceedings of SPIE
Issue or Number:8151
DOI:10.1117/12.895032
Record Number:CaltechAUTHORS:20150526-084726251
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150526-084726251
Official Citation:John Trauger ; Dwight Moody ; Brian Gordon ; John Krist and Dimitri Mawet "A hybrid Lyot coronagraph for the direct imaging and spectroscopy of exoplanet systems: recent results and prospects", Proc. SPIE 8151, Techniques and Instrumentation for Detection of Exoplanets V, 81510G (September 15, 2011); doi:10.1117/12.895032
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57794
Collection:CaltechAUTHORS
Deposited By:INVALID USER
Deposited On:26 May 2015 20:19
Last Modified:10 Nov 2021 21:55

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