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    ON-SKY PERFORMANCE ANALYSIS OF THE VECTOR APODIZING PHASE PLATE CORONAGRAPH ON MagAO/Clio2

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    Author
    Otten, Gilles P. P. L.
    Snik, Frans
    Kenworthy, Matthew A. cc
    Keller, Christoph U.
    Males, Jared R. cc
    Morzinski, Katie M. cc
    Close, Laird M. cc
    Codona, Johanan L.
    Hinz, Philip M.
    Hornburg, Kathryn J.
    Brickson, Leandra L.
    Escuti, Michael J.
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    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-01-12
    Keywords
    infrared: planetary systems
    instrumentation: high angular resolution
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    ON-SKY PERFORMANCE ANALYSIS OF THE VECTOR APODIZING PHASE PLATE CORONAGRAPH ON MagAO/Clio2 2017, 834 (2):175 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2017. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We report on the performance of a vector apodizing phase plate coronagraph that operates over a wavelength range of 2-5 mu m. and is installed in MagAO/Clio2 at the 6.5 m Magellan Clay telescope at Las Campanas Observatory, Chile. The coronagraph manipulates the phase in the pupil to produce three beams yielding two coronagraphic point-spread functions (PSFs) and one faint leakage PSF. The phase pattern is imposed through the inherently achromatic geometric phase, enabled by liquid crystal technology and polarization techniques. The coronagraphic optic is manufactured using a direct-write technique for precise control of the liquid crystal pattern. and multitwist retarders for achromatization. By integrating a linear phase ramp to the coronagraphic phase pattern, two separated coronagraphic PSFs are created with a single pupil-plane optic, which makes it robust and easy to install in existing telescopes. The two coronagraphic PSFs contain a 180 degrees dark hole on each side of a star, and these complementary copies of the star are used to correct the seeing halo close to the star. To characterize the coronagraph, we collected a data set of a bright (m(L) = 0-1) nearby star with similar to 1.5 hr of observing time. By rotating and optimally scaling one PSF. and subtracting it from the other PSF, we see a contrast improvement by 1.46 magnitudes at 3.5 lambda/D. With regular angular differential imaging at 3.9 mu m, the MagAO vector apodizing phase plate coronagraph delivers a 5 sigma Delta mag contrast of 8.3 (= 10(-3.3)) at 2 lambda/D and 12.2 (= 10(-4.8)) at 3.5 lambda/D.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/834/2/175
    Version
    Final published version
    Sponsors
    Netherlands Organization for Scientific Research (NWO); European Research Council [678194]; NASA Exoplanets Research Program (XRP) [NNX16AD44G]
    Additional Links
    http://stacks.iop.org/0004-637X/834/i=2/a=175?key=crossref.5e18dcdc89f570dcdc60dc1098e7f0f6
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/834/2/175
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    UA Faculty Publications

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