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    Tidal dissipation in rubble-pile asteroids

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    Author
    Nimmo, Francis
    Matsuyama, Isamu cc
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2019-03-15
    
    Metadata
    Show full item record
    Publisher
    ACADEMIC PRESS INC ELSEVIER SCIENCE
    Citation
    Nimmo, F., & Matsuyama, I. (2019). Tidal dissipation in rubble-pile asteroids. Icarus, 321, 715-721.
    Journal
    ICARUS
    Rights
    © 2018 Elsevier Inc. 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 develop a simple scaling argument for frictional dissipation in rubble-pile asteroids, parameterized as an effective dissipation factor Q. This scaling is combined with a prediction (Goldreich, P., Sari, R., 2009. Tidal evolution of rubble piles. Astrophys. J. 691, 54-60) for the tidal response amplitude, parameterized by the Love number k(2). We compare the combined scaling with k(2)/Q values inferred from asteroid binaries in which the semi-major axis is determined by a balance between tidal dissipation and the binary YORP (or BYORP) effect (Jacobson, S.A., Scheeres, D.J., 2011. Long-term stable equilibria for synchronous binary asteroids. Astrophys. J. Lett. 736, L19). The k(2)/Q scaling matches the inferred values if dissipation is confined to a regolith layer of thickness similar to 30 m, similar to the available asteroid regolith thickness estimates. The scaling suggests a regolith thickness that is independent of (or decreases slightly with) increasing asteroid radius; this result is consistent with at least one model of regolith generation via impacts.
    Note
    12 month embargo; available online 12 December 2018.
    ISSN
    00191035
    DOI
    10.1016/j.icarus.2018.12.012
    Version
    Final accepted manuscript
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0019103518304500
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.icarus.2018.12.012
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