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    The Complete Transmission Spectrum of WASP-39b with a Precise Water Constraint

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    Wakeford_2018_AJ_155_29.pdf
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    Author
    Wakeford, H. R. cc
    Sing, D. K. cc
    Deming, D.
    Lewis, N. K. cc
    Goyal, J.
    Wilson, T. J.
    Barstow, J. cc
    Kataria, T. cc
    Drummond, B. cc
    Evans, T. M. cc
    Carter, A. L.
    Nikolov, N.
    Knutson, H. A.
    Ballester, G. E.
    Mandell, A. M. cc
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    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2017-12-20
    Keywords
    planets and satellites: atmospheres
    planets and satellites: individual (WASP-39b)
    techniques: spectroscopic
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    The Complete Transmission Spectrum of WASP-39b with a Precise Water Constraint 2017, 155 (1):29 The Astronomical Journal
    Journal
    The Astronomical 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
    WASP-39b is a hot Saturn-mass exoplanet with a predicted clear atmosphere based on observations in the optical and infrared. Here, we complete the transmission spectrum of the atmosphere with observations in the near-infrared (NIR) over three water absorption features with the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) G102 (0.8-1.1 mu m) and G141 (1.1-1.7 mu m) spectroscopic grisms. We measure the predicted high-amplitude H2O feature centered at 1.4 mu m and the smaller amplitude features at 0.95 and 1.2 mu m, with a maximum water absorption amplitude of 2.4 planetary scale heights. We incorporate these new NIR measurements into previously published observational measurements to complete the transmission spectrum from 0.3 to 5 mu m. From these observed water features, combined with features in the optical and IR, we retrieve a well constrained temperature T-eq = 1030(20)(+30) K, and atmospheric metallicity 151(46) (+48) solar, which is relatively high with respect to the currently established mass-metallicity trends. This new measurement in the Saturn-mass range hints at further diversity in the planet formation process relative to our solar system giants.
    ISSN
    1538-3881
    DOI
    10.3847/1538-3881/aa9e4e
    Version
    Final published version
    Sponsors
    European Research Council (ERC) under the European Unions Seventh Framework Programme (FP7)/ERC grant [336792]; Leverhulme Trust; STFC; Giacconi Fellowship at the Space Telescope Science Institute by the Association of Universities for Research in Astronomy, Inc.; [GO-14169]; [GO-14260]
    Additional Links
    http://stacks.iop.org/1538-3881/155/i=1/a=29?key=crossref.514ec2fba37ccb9b9b304f11dc745af0
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-3881/aa9e4e
    Scopus Count
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    UA Faculty Publications

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