• Login
    View Item 
    •   Home
    • UA Faculty Research
    • UA Faculty Publications
    • View Item
    •   Home
    • UA Faculty Research
    • UA Faculty Publications
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of UA Campus RepositoryCommunitiesTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournalThis CollectionTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournal

    My Account

    LoginRegister

    About

    AboutUA Faculty PublicationsUA DissertationsUA Master's ThesesUA Honors ThesesUA PressUA YearbooksUA CatalogsUA Libraries

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    3.8 μm Imaging of 400–600 K Brown Dwarfs and Orbital Constraints for WISEP J045853.90+643452.6AB

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Leggett_2019_ApJ_882_117.pdf
    Size:
    1.669Mb
    Format:
    PDF
    Description:
    Final Published Version
    Download
    Author
    Leggett, S. K.
    Dupuy, Trent J.
    Morley, Caroline V.
    Marley, Mark S. cc
    Best, William M. J.
    Liu, Michael C.
    Apai, D.
    Casewell, S. L.
    Geballe, T. R.
    Gizis, John E.
    Pineda, J. Sebastian
    Rieke, Marcia
    Wright, G. S.
    Show allShow less
    Affiliation
    Univ Arizona, Dept Astron, Steward Observ
    Univ Arizona, Dept Planetary Sci, Lunar & Planetary Lab
    Univ Arizona, Steward Observ
    Issue Date
    2019-09-09
    Keywords
    astrometry
    binaries: general
    brown dwarfs
    infrared: stars
    stars: atmospheres
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    S. K. Leggett et al 2019 ApJ 882 117
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    Copyright © 2019. 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
    Half of the energy emitted by late-T- and Y-type brown dwarfs emerges at 3.5 <= lambda mu m <= 5.5. We present new L' (3.43 <= lambda mu m <= 4.11) photometry obtained at the Gemini North telescope for nine late-T and Y dwarfs, and synthesize L' from spectra for an additional two dwarfs. The targets include two binary systems that were imaged at a resolution of 0.'' 25. One of these, WISEP J045853.90+643452.6AB, shows significant motion, and we present an astrometric analysis of the binary using Hubble Space Telescope, Keck Adaptive Optics, and Gemini images. We compare lambda similar to 4 mu m observations to models, and find that the model fluxes are too low for brown dwarfs cooler than similar to 700 K. The discrepancy increases with decreasing temperature, and is a factor of similar to 2 at T-eff = 500 K and similar to 4 at T-eff = 400 K. Warming the upper layers of a model atmosphere generates a spectrum closer to what is observed. The thermal structure of cool brown dwarf atmospheres above the radiative-convective boundary may not be adequately modeled using pure radiative equilibrium; instead heat may be introduced by thermochemical instabilities (previously suggested for the L- to T-type transition) or by breaking gravity waves (previously suggested for the solar system giant planets). One-dimensional models may not capture these atmospheres, which likely have both horizontal and vertical pressure/temperature variations.
    ISSN
    0004-637X
    DOI
    10.3847/1538-4357/ab3393
    Version
    Final published version
    Sponsors
    National Aeronautics and Space AdministrationNational Aeronautics & Space Administration (NASA); NASANational Aeronautics & Space Administration (NASA) [NAS 5-26555]; W. M. Keck FoundationW.M. Keck Foundation; NSFNational Science Foundation (NSF) [AST-1518339]
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/ab3393
    Scopus Count
    Collections
    UA Faculty Publications

    entitlement

     
    The University of Arizona Libraries | 1510 E. University Blvd. | Tucson, AZ 85721-0055
    Tel 520-621-6442 | repository@u.library.arizona.edu
    DSpace software copyright © 2002-2017  DuraSpace
    Quick Guide | Contact Us | Send Feedback
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.