• 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

    Atmospheric Circulations of Hot Jupiters as Planetary Heat Engines

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Koll_2018_ApJ_853_133.pdf
    Size:
    779.5Kb
    Format:
    PDF
    Download
    Author
    Koll, Daniel D. B. cc
    Komacek, Thaddeus D. cc
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Univ Arizona, Dept Planetary Sci
    Issue Date
    2018-01-31
    Keywords
    hydrodynamics
    methods: analytical
    methods: numerical
    planets and satellites: atmospheres
    planets and satellites: individual (HD 189733b, HD 209458b)
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Atmospheric Circulations of Hot Jupiters as Planetary Heat Engines 2018, 853 (2):133 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2018. 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
    Because of their intense incident stellar irradiation and likely tidally locked spin states, hot Jupiters are expected to have wind speeds that approach or exceed the speed of sound. In this work, we develop a theory to explain the magnitude of these winds. We model hot Jupiters as planetary heat engines and show that hot Jupiters are always less efficient than an ideal Carnot engine. Next, we demonstrate that our predicted wind speeds match those from three-dimensional numerical simulations over a broad range of parameters. Finally, we use our theory to evaluate how well different drag mechanisms can match the wind speeds observed with Doppler spectroscopy for HD 189733b and HD 209458b. We find that magnetic drag is potentially too weak to match the observations for HD 189733b, but is compatible with the observations for HD 209458b. In contrast, shear instabilities and/or shocks are compatible with both observations. Furthermore, the two mechanisms predict different wind speed trends for hotter and colder planets than currently observed. As a result, we propose that a wider range of Doppler observations could reveal multiple drag mechanisms at play across different hot Jupiters.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/aaa3de
    Version
    Final published version
    Sponsors
    James McDonnell Foundation postdoctoral fellowship; NASA Earth and Space Science fellowship; Heising-Simons Foundation
    Additional Links
    http://stacks.iop.org/0004-637X/853/i=2/a=133?key=crossref.a9221961fcb02a76bd2bb360af5d3c8b
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/aaa3de
    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.