OSSOS. XVIII. Constraining Migration Models with the 2:1 Resonance Using the Outer Solar System Origins Survey
Lehner, Matthew J.
Kavelaars, J. J.
Lykawka, Patryk Sofia
Bannister, Michele T.
Lawler, Samantha M.
Dawson, Rebekah I.
Gwyn, Stephen D. J.
AffiliationUniv Arizona, Lunar & Planetary Lab
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationYing-Tung Chen et al 2019 AJ 158 214
RightsCopyright © 2019. The American Astronomical Society. All rights reserved.
Collection InformationThis 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 firstname.lastname@example.org.
AbstractResonant dynamics plays a significant role in the past evolution and current state of our outer solar system. The population ratios and spatial distribution of Neptune?s resonant populations are direct clues to understanding the history of our planetary system. The orbital structure of the objects in Neptune?s 2:1 mean-motion resonance ("twotinos") has the potential to be a tracer of planetary migration processes. Different migration processes produce distinct architectures, recognizable by well-characterized surveys. However, previous characterized surveys only discovered a few twotinos, making it impossible to model the intrinsic twotino population. With a well-designed cadence and nearly 100% tracking success, the Outer Solar System Origins Survey (OSSOS) discovered 838 trans-Neptunian objects, of which 34 are securely twotinos with well-constrained libration angles and amplitudes. We use the OSSOS twotinos and the survey characterization parameters via the OSSOS survey simulator to inspect the intrinsic population and orbital distributions of twotinos. The estimated twotino population, 8.66 (diameter ?100 km) at 95% confidence, is consistent with the previous low-precision estimate. We also constrain the width of the inclination distribution to a relatively narrow value of 0.275 with a width 0.06. We find a single-slope exponential luminosity function with 0.6 for the twotinos. Finally, for the first time, we meaningfully constrain the fraction of symmetric twotinos and the ratio of the leading asymmetric islands; both fractions are in the range of 0.2?0.6. These measurements rule out certain theoretical models of Neptune's migration history.
VersionFinal published version
SponsorsNRC-Canada; UBC; National Aeronautics & Space Administration (NASA) [NNX14AG93G, NNX15AH59G]; National Science Foundation (NSF) [AST-1824869]; NSERC Canada Natural Sciences and Engineering Research Council of Canada; UK Science and Technology Facilities Council Science & Technology Facilities Council (STFC) [ST/P0003094/1]; Pennsylvania State University; Eberly College of Science; Pennsylvania Space Grant Consortium; NRC-Canada Plaskett Fellowship; Alfred P. Sloan Foundation's Research Fellowship