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    MAPS OF EVOLVING CLOUD STRUCTURES IN LUHMAN 16AB FROM HST TIME-RESOLVED SPECTROSCOPY

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    Karalidi_2016_ApJ_825_90.pdf
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    Description:
    Final Published Version
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    Author
    Karalidi, Theodora cc
    Apai, Dániel cc
    Marley, Mark S. cc
    Buenzli, Esther cc
    Affiliation
    Univ Arizona, Dept Astron, Steward Observ
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2016-07-06
    Keywords
    methods: statistical
    stars: individual (WISE J104915.57-531906.1)
    techniques: photometric
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    MAPS OF EVOLVING CLOUD STRUCTURES IN LUHMAN 16AB FROM HST TIME-RESOLVED SPECTROSCOPY 2016, 825 (2):90 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2016. 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
    WISE J104915.57-531906.1 is the nearest brown dwarf binary to our solar system, consisting of two brown dwarfs in the L/T transition: Luhman 16A and B. In this paper, we present the first map of Luhman 16A, and maps of Luhman 16B for two epochs. Our maps were created by applying Aeolus, a Markov-Chain Monte Carlo code that maps the top-of-the-atmosphere (TOA) structure of brown dwarf and other ultracool atmospheres, to light curves of Luhman 16A and B using the Hubble Space Telescope's G141 and G102 grisms. Aeolus retrieved three or four spots in the TOA of Luhman 16A and B, with a surface coverage of 19%-32% (depending on an assumed rotational period of 5 hr or 8 hr) or 21%-38.5% (depending on the observational epoch), respectively. The brightness temperature of the spots of the best-fit models was similar to 200 K hotter than the background TOA. We compared our Luhman 16B map with the only previously published map. Interestingly, our map contained a large TOA spot that was cooler (Delta T similar to 51 K) than the background, which lay at low latitudes, in agreement with the previous Luhman 16B map. Finally, we report the detection of a feature reappearing in Luhman 16B light curves that are separated by tens of hundreds of rotations from each other. We speculate that this feature is related to TOA structures of Luhman 16B.
    ISSN
    1538-4357
    DOI
    10.3847/0004-637X/825/2/90
    Version
    Final published version
    Sponsors
    Spitzer Cycle-9 Exploration Program Extrasolar Storms [90063]; NASA by JPL/Caltech; NASA from the Space Telescope Science Institute [12314]; NASA [NAS5-26555, NAS 526555]; National Aeronautics and Space Administration [NNX15AD94G]
    Additional Links
    http://stacks.iop.org/0004-637X/825/i=2/a=90?key=crossref.f469f9fe9c97d8c76b5482adbe217700
    ae974a485f413a2113503eed53cd6c53
    10.3847/0004-637X/825/2/90
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    UA Faculty Publications

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