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Communication Dans Un Congrès Année : 2018

Two objects in Neptune's 9:1 resonance -- implications for resonance sticking in the scattering population

Kathryn Volk
Brett Gladman
Michele Bannister
Rebekah Dawson
Sarah Greenstreet
Stephen Gwyn
Hsing Wen Lin
Patryk Lykawka
  • Fonction : Auteur

Résumé

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 1.1×104 objects with Hr<8.66 (D > 100 km) on similar orbits, with 95% confidence range of ∼0.4-3×104. 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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hal-03573026 , version 1 (14-02-2022)

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Kathryn Volk, Ruth Murray-Clay, Brett Gladman, Samantha Lawler, Tze Yeung Mathew Yu, et al.. Two objects in Neptune's 9:1 resonance -- implications for resonance sticking in the scattering population. American Astronomical Society, DDA meeting #49, American Astronomical Society, Apr 2018, San Jose, United States. pp.id.103.02. ⟨hal-03573026⟩
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