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    A High-precision Technique to Correct for Residual Atmospheric Dispersion in High-contrast Imaging Systems

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    Pathak_2016_PASP_128_124404.pdf
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    Author
    Pathak, P.
    Guyon, O.
    Jovanovic, N.
    Lozi, J.
    Martinache, F.
    Minowa, Y.
    Kudo, T.
    Takami, H.
    Hayano, Y.
    Narita, N.
    Affiliation
    Steward Observatory, University of Arizona
    Issue Date
    2016-12-01
    Keywords
    instrumentation: adaptive optics
    atmospheric effects
    planets and satellites: detection
    
    Metadata
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    Publisher
    IOP PUBLISHING LTD
    Citation
    A High-precision Technique to Correct for Residual Atmospheric Dispersion in High-contrast Imaging Systems 2016, 128 (970):124404 Publications of the Astronomical Society of the Pacific
    Journal
    Publications of the Astronomical Society of the Pacific
    Rights
    © 2016. The Astronomical Society of the Pacific. 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
    Direct detection and spectroscopy of exoplanets requires high-contrast imaging. For habitable exoplanets in particular, located at a small angular separation from the host star, it is crucial to employ small inner working angle (IWA) coronagraphs that efficiently suppress starlight. These coronagraphs, in turn, require careful control of the wavefront that directly impacts their performance. For ground-based telescopes, atmospheric refraction is also an important factor, since it results in a smearing of the point-spread function (PSF), that can no longer be efficiently suppressed by the coronagraph. Traditionally, atmospheric refraction is compensated for by an atmospheric dispersion compensator (ADC). ADC control relies on an a priori model of the atmosphere whose parameters are solely based on the pointing of the telescope, which can result in imperfect compensation. For a high-contrast instrument like the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system, which employs very small IWA coronagraphs, refraction-induced smearing of the PSF has to be less than 1 mas in the science band for optimum performance. In this paper, we present the first on-sky measurement and correction of residual atmospheric dispersion. Atmospheric dispersion is measured from the science image directly, using an adaptive grid of artificially introduced speckles as a diagnostic to feedback to the telescope's ADC. With our current setup, we were able to reduce the initial residual atmospheric dispersion from 18.8 mas to 4.2 in broadband light (y- to H-band) and to 1.4 mas in the H-band only. This work is particularly relevant to the upcoming extremely large telescopes (ELTs) that will require fine control of their ADC to reach their full high-contrast imaging potential.
    Note
    Published open access.
    ISSN
    0004-6280
    1538-3873
    DOI
    10.1088/1538-3873/128/970/124404
    Version
    Final published manuscript
    Sponsors
    JSPS [23340051, 26220704]
    Additional Links
    http://stacks.iop.org/1538-3873/128/i=970/a=124404?key=crossref.57f36c959043c7a0f55048c3df0f107e
    ae974a485f413a2113503eed53cd6c53
    10.1088/1538-3873/128/970/124404
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    UA Faculty Publications

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