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    Implications for the origin and evolution of Martian Recurring Slope Lineae at Hale crater from CaSSIS observations

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    Munaretto_2020_PSS_unmarked-Re ...
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    Author
    Munaretto, G.
    Pajola, M.
    Cremonese, G.
    Re, C.
    Lucchetti, A.
    Simioni, E.
    McEwen, A.S.
    Pommerol, A.
    Becerra, P.
    Conway, S.J.
    Thomas, N.
    Massironi, M.
    Show allShow less
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2020-08
    Keywords
    Recurring slope lineae
    RSL
    CaSSIS
    HiRISE
    Mars
    Relative albedo
    THEMIS
    
    Metadata
    Show full item record
    Publisher
    PERGAMON-ELSEVIER SCIENCE LTD
    Citation
    Munaretto, G., Pajola, M., Cremonese, G., Re, C., Lucchetti, A., Simioni, E., ... & Thomas, N. (2020). Implications for the origin and evolution of Martian Recurring Slope Lineae at Hale crater from CaSSIS observations. Planetary and Space Science, 104947. https://doi.org/10.1016/j.pss.2020.104947
    Journal
    PLANETARY AND SPACE SCIENCE
    Rights
    © 2020 Elsevier Ltd. 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
    Recurring Slope Lineae (RSL) are narrow, dark features that typically source from rocky outcrops, incrementally lengthen down Martian steep slopes in warm seasons, fade in cold seasons and recur annually. In this study we report the first observations of RSL at Hale crater, Mars, during late southern summer by the Color and Surface Science Imaging System (CaSSIS) on board ESA's ExoMars Trace Gas Orbiter (TGO). For the first time, we analyze images of RSL acquired during morning solar local times and compare them with High Resolution Imaging Science Experiment (HiRISE) observations taken in the afternoon. We find that RSL activity is correlated with the presence of steep slopes. Our thermal analysis establishes that local temperatures are high enough to allow either the melting of brines or deliquescence of salts during the observation period, but the slope and aspect distributions of RSL activity predicted by these processes are not consistent with our observations. We do not find any significant relative albedo difference between morning and afternoon RSL. Differences above 11% would have been detected by our methodology, if present. This instead suggests that RSL at Hale crater are not caused by seeping water that reaches the surface, but are best explained as dry flows of granular material.
    Note
    24 month embargo; published online: 5 May 2020
    ISSN
    0032-0633
    DOI
    10.1016/j.pss.2020.104947
    Version
    Final accepted manuscript
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.pss.2020.104947
    Scopus Count
    Collections
    UA Faculty Publications

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