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    OSSOS. IX. Two Objects in Neptune's 9:1 Resonance—Implications for Resonance Sticking in the Scattering Population

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    Volk_2018_AJ_155_260.pdf
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    Author
    Volk, Kathryn cc
    Murray-Clay, Ruth A.
    Gladman, Brett J.
    Lawler, Samantha M. cc
    Yu, Tze Yeung Mathew
    Alexandersen, Mike
    Bannister, Michele T. cc
    Chen, Ying-Tung cc
    Dawson, Rebekah I. cc
    Greenstreet, Sarah
    Gwyn, Stephen D. J.
    Kavelaars, J. J. cc
    Lin, Hsing Wen cc
    Lykawka, Patryk Sofia
    Petit, Jean-Marc cc
    Show allShow less
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2018-06
    Keywords
    Kuiper belt: general
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Kathryn Volk et al 2018 AJ 155 260
    Journal
    ASTRONOMICAL 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
    We discuss the detection in the Outer Solar System Origins Survey (OSSOS) of two objects in Neptune's distant 9:1 mean motion resonance at semimajor axis a approximate to 130 au. Both objects are securely resonant on 10 Myr timescales, with one securely in the 9:1 resonance's leading asymmetric libration island and the other in either the symmetric or trailing asymmetric island. These objects are the largest semimajor axis objects with secure resonant classifications, and their detection in a carefully characterized survey allows for the first robust resonance population estimate beyond 100 au. The detection of these objects implies a 9:1 resonance population of 1.1 x 10(4) objects with H-r < 8.66 (D greater than or similar to 100 km) on Ksimilar orbits (95% confidence range of similar to(0.4-3) x 104). Integrations over4 Gyr of an ensemble of clones spanning these objects' orbit-fit uncertainties reveal that they both have median resonance occupation timescales of similar to 1 Gyr. These timescales are consistent with the hypothesis that these objects originate in the scattering population but became transiently stuck to Neptune's 9:1 resonance within the last similar to 1 Gyr of solar system evolution. Based on simulations of a model of the current scattering population, we estimate the expected resonance sticking population in the 9:1 resonance to be 1000-4500 objects with H-r < 8.66; this is marginally consistent with the OSSOS 9:1 population estimate. We conclude that resonance sticking is a plausible explanation for the observed 9:1 population, but we also discuss the possibility of a primordial 9:1 population, which would have interesting implications for the Kuiper Belt's dynamical his tory.
    ISSN
    1538-3881
    DOI
    10.3847/1538-3881/aac268
    Version
    Final published version
    Sponsors
    NASA Solar System Workings grant [NNX15AH59G]; NASA [NNX14AG93G]; NRC-Canada Plaskett Fellowship; UK STFC grant [ST/L000709/1]; Pennsylvania State University; Eberly College of Science; Pennsylvania Space Grant Consortium
    Additional Links
    http://stacks.iop.org/1538-3881/155/i=6/a=260?key=crossref.1c5da7dba3d3bf9e9bf39494a8d28d84
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-3881/aac268
    Scopus Count
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    UA Faculty Publications

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