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    Performance Verification of the EXtreme PREcision Spectrograph

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    Blackman_2020_AJ_159_238.pdf
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    Final Published Version
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    Author
    Blackman, Ryan T.
    Fischer, Debra A. cc
    Jurgenson, Colby A.
    Sawyer, David
    McCracken, Tyler M.
    Szymkowiak, Andrew E.
    Petersburg, Ryan R.
    Joel Ong, J. M.
    Brewer, John M. cc
    Zhao, Lily L.
    Leet, Christopher
    Buchhave, Lars A.
    Tronsgaard, René
    Llama, Joe
    Sawyer, Travis
    Davis, Allen B.
    Cabot, Samuel H. C.
    Shao, Michael
    Trahan, Russell
    Nemati, Bijan
    Genoni, Matteo
    Pariani, Giorgio
    Riva, Marco
    Fournier, Paul
    Pawluczyk, Rafal
    Show allShow less
    Affiliation
    Univ Arizona, Coll Opt Sci
    Issue Date
    2020-04-29
    Keywords
    Astronomical instrumentation
    High resolution spectroscopy
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Ryan T. Blackman et al 2020 AJ 159 238
    Journal
    ASTRONOMICAL JOURNAL
    Rights
    Copyright © 2020. 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
    The EXtreme PREcision Spectrograph (EXPRES) is a new Doppler spectrograph designed to reach a radial-velocity measurement precision sufficient to detect Earth-like exoplanets orbiting nearby, bright stars. We report on extensive laboratory testing and on-sky observations to quantitatively assess the instrumental radial-velocity measurement precision of EXPRES, with a focused discussion of individual terms in the instrument error budget. We find that EXPRES can reach a single-measurement instrument calibration precision better than 10 cm s(-1), not including photon noise from stellar observations. We also report on the performance of the various environmental, mechanical, and optical subsystems of EXPRES, assessing any contributions to radial-velocity error. For atmospheric and telescope related effects, this includes the fast tip-tilt guiding system, atmospheric dispersion compensation, and the chromatic exposure meter. For instrument calibration, this includes the laser fRequency comb (LFC), flat-field light source, CCD detector, and effects in the optical fibers. Modal noise is mitigated to a negligible level via a chaotic fiber agitator, which is especially important for wavelength calibration with the LFC. Regarding detector effects, we empirically assess the impact on the radial-velocity precision due to pixel-position nonuniformities and charge transfer inefficiency (CTI). EXPRES has begun its science survey to discover exoplanets orbiting G-dwarf and K-dwarf stars, in addition to transit spectroscopy and measurements of the Rossiter-McLaughlin effect.
    ISSN
    0004-6256
    DOI
    10.3847/1538-3881/ab811d
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-3881/ab811d
    Scopus Count
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    UA Faculty Publications

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