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    High-contrast Thermal Infrared Spectroscopy with ALES: The 3–4 μm Spectrum of κ Andromedae b

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    Stone_2020_AJ_160_262.pdf
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    Author
    Stone, Jordan M.
    Barman, Travis
    Skemer, Andrew J.
    Briesemeister, Zackery W.
    Brock, Laci S.
    Hinz, Philip M.
    Leisenring, Jarron M.
    Woodward, Charles E.
    Skrutskie, Michael F.
    Spalding, Eckhart
    Affiliation
    Univ Arizona, Steward Observ
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2020-11-13
    Keywords
    L dwarfs
    Exoplanet astronomy
    Atmospheric composition
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Stone, J. M., Barman, T., Skemer, A. J., Briesemeister, Z. W., Brock, L. S., Hinz, P. M., ... & Spalding, E. (2020). High-contrast Thermal Infrared Spectroscopy with ALES: The 3–4 μm Spectrum of κ Andromedae b. The Astronomical Journal, 160(6), 262.
    Journal
    ASTRONOMICAL JOURNAL
    Rights
    © 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
    We present the first L-band (2.8-4.1 mu m) spectroscopy of kappa Andromedae b, a similar to 20 M-Jup companion orbiting at 1 '' projected separation from its B9-type stellar host. We combine our Large Binocular Telescope (LBT) Arizona Lenslets for Exoplanet Spectroscopy (ALES) integral field spectrograph data with measurements from other instruments to analyze the atmosphere and physical characteristics of kappa And b. We report a discrepancy of similar to 20% (2 sigma) in the L ' flux of kappa And b when comparing to previously published values. We add an additional L ' constraint using an unpublished imaging data set collected in 2013 using the LBT Interferometer/LMIRCam, the instrument in which the ALES module has been built. The LMIRCam measurement is consistent with the ALES measurement, both suggesting a fainter L-band scaling than previous studies. The data, assuming the flux scaling measured by ALES and LMIRCam imaging, are well fit by an L3-type brown dwarf. Atmospheric model fits to measurements spanning 0.9-4.8 mu m reveal some tension with the predictions of evolutionary models, but the proper choice of cloud parameters can provide some relief. In particular, models with clouds extending to very low pressures composed of grains <= 1 mu m appear to be necessary. If the brighter L ' photometry is accurate, there is a hint that subsolar metallicity may be required.
    ISSN
    0004-6256
    EISSN
    1538-3881
    DOI
    10.3847/1538-3881/abbef3
    Version
    Final published version
    Sponsors
    Space Telescope Science Institute
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-3881/abbef3
    Scopus Count
    Collections
    UA Faculty Publications

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