| Download | - View final version: OSSOS IX: two objects in Neptune's 9:1 resonance -- implications for resonance sticking in the scattering population (PDF, 967 KiB)
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| Author | Search for: Volk, Kathryn; Search for: Murray-Clay, Ruth A.; Search for: Gladman, Brett J.1; Search for: Lawler, Samantha M.1; Search for: Yu, Tze Yeung Mathew; Search for: Alexandersen, Mike1; Search for: Bannister, Michele T.1; Search for: Chen, Ying-Tung; Search for: Dawson, Rebekah I.; Search for: Greenstreet, Sarah; Search for: Gwyn, Stephen D. J.1; Search for: Kavelaars, J. J.1; Search for: Lin, Hsing Wen; Search for: Lykawka, Patryk Sofia; Search for: Petit, Jean-Marc |
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| Affiliation | - National Research Council of Canada. Herzberg Astronomy and Astrophysics
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| Format | Text, Article |
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| 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≈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 two objects are the largest semimajor axis objects known with secure resonant classifications, and their detection in a carefully characterized survey allows for the first robust population estimate for a resonance beyond 100~au. The detection of these two objects implies a population in the 9:1 resonance of 1.1×10 4 objects with Hr <8.66 (D≳100 ~km) on similar orbits, with 95\% confidence range of ∼0.4−3×10 4. Integrations over 4 Gyr of an ensemble of clones chosen from within the orbit fit uncertainties for these objects reveal that they both have median resonance occupation timescales of ∼1 ~Gyr. These timescales are consistent with the hypothesis that these two objects originate in the scattering population but became transiently stuck to Neptune's 9:1 resonance within the last ∼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--5000 objects with Hr <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 history. |
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| Publication date | 2018-02-15 |
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| Publisher | Cornell University Library |
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| In | |
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| Language | English |
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| Peer reviewed | No |
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| NPARC number | 23002840 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | c09cc660-819e-40ce-b6ca-bb84c38e5f86 |
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| Record created | 2018-03-09 |
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| Record modified | 2020-05-30 |
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