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    Pushing the limits of the coronagraphic occulters on Hubble Space Telescope/Space Telescope Imaging Spectrograph

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    Author
    Debes, John H. cc
    Ren, Bin
    Schneider, Glenn cc
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2019-06-13
    Keywords
    image processing
    speckle
    point spread functions
    planets
    charge-coupled-device imagers
    
    Metadata
    Show full item record
    Publisher
    SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
    Citation
    John H. Debes, Bin Ren, and Glenn Schneider "Pushing the limits of the coronagraphic occulters on Hubble Space Telescope/Space Telescope Imaging Spectrograph," Journal of Astronomical Telescopes, Instruments, and Systems 5(3), 035003 (13 June 2019). https://doi.org/10.1117/1.JATIS.5.3.035003
    Journal
    JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
    Rights
    Copyright © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
    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
    The Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph (STIS) contains the only currently operating coronagraph in space that is not trained on the Sun. In an era of extreme-adaptive-optics-fed coronagraphs, and with the possibility of future space-based coronagraphs, we re-evaluate the contrast performance of the STIS CCD camera. The 50CORON aperture consists of a series of occulting wedges and bars, including the recently commissioned BAR5 occulter. We discuss the latest procedures in obtaining high-contrast imaging of circumstellar disks and faint point sources with STIS. For the first time, we develop a noise model for the coronagraph, including systematic noise due to speckles, which can be used to predict the performance of future coronagraphic observations. Further, we present results from a recent calibration program that demonstrates better than 10  −  6 point-source contrast at 0.6″, ranging to 3  ×  10  −  5 point-source contrast at 0.25″. These results are obtained by a combination of subpixel grid dithers, multiple spacecraft orientations, and postprocessing techniques. Some of these same techniques will be employed by future space-based coronagraphic missions. We discuss the unique aspects of STIS coronagraphy relative to ground-based adaptive-optics-fed coronagraphs.
    Note
    Open access article
    ISSN
    2329-4124
    DOI
    10.1117/1.jatis.5.3.035003
    Version
    Final published version
    Sponsors
    HST GO program [13786, 15219]; State of Maryland grant through the Institute for Data Intensive Engineering and Science (IDIES)
    ae974a485f413a2113503eed53cd6c53
    10.1117/1.jatis.5.3.035003
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