@article{d66809699aee4289a8321a63d76e857e,
title = "Ossos. XVIII. Constraining migration models with the 2:1 resonance using the Outer Solar System Origins survey",
abstract = "Resonant 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, 4400- + 1100 1500 with Hr < 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 si = 6- °+ 1 1 and find that the eccentricity distribution is consistent with a Gaussian centered on ec = 0.275 with a width ew = 0.06. We find a single-slope exponential luminosity function with α = 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.",
author = "Chen, {Ying Tung} and Brett Gladman and Kathryn Volk and Ruth Murray-Clay and Lehner, {Matthew J.} and Kavelaars, {J. J.} and Wang, {Shiang Yu} and Lin, {Hsing Wen} and Lykawka, {Patryk Sofia} and Mike Alexandersen and Bannister, {Michele T.} and Lawler, {Samantha M.} and Dawson, {Rebekah I.} and Sarah Greenstreet and Gwyn, {Stephen D.J.} and Petit, {Jean Marc}",
note = "Funding Information: The authors acknowledge the staff of the Canada–France– Hawaii Telescope for their amazing effort in this project. We are grateful to Jian Li for kindly providing the data from his study of the twotino inclination distribution. Y.-T.C. gratefully acknowledges support from NRC-Canada and UBC, enabling a scholarly visit in the early phase of this study. Y.-T.C. also acknowledge Renu Malhotra for helpful conversations. K.V. and R.M.C. acknowledge support from NASA grant NNX15AH59G. K.V. acknowledges additional support from NASA grant NNX14AG93G and NSF grant AST-1824869. B.G. acknowledges NSERC Canada for research support. M.T.B. acknowledges support from UK Science and Technology Facilities Council grant ST/P0003094/1. The Center for Exoplanets and Habitable Worlds is supported by the Pennsylvania State University, the Eberly College of Science, and the Pennsylvania Space Grant Consortium. S.M.L. gratefully acknowledges support from the NRC-Canada Plaskett Fellowship. R.I.D. is supported in part by Alfred P. Sloan Foundation{\textquoteright}s Research Fellowship. Based on observations obtained with MegaPrime/ MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada–France–Hawaii Telescope (CFHT), which is operated by the National Research Council (NRC) of Canada, the Institut National des Science de l{\textquoteright}Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii, with this project receiving additional access due to contributions from the Institute of Astronomy and Astrophysics, Academia Sinica, National Tsing Hua University, and Ministry of Science and Technology, Taiwan. Facility: CFHT (MegaCam). Publisher Copyright: {\textcopyright} 2019. The American Astronomical Society. All rights reserved.",
year = "2019",
month = nov,
doi = "10.3847/1538-3881/ab480b",
language = "English (US)",
volume = "158",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "5",
}