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On the Dynamical Origins of Retrograde Jupiter Trojans and their Connection to High-Inclination TNOs

Köhne, Tobias and Batygin, Konstantin (2020) On the Dynamical Origins of Retrograde Jupiter Trojans and their Connection to High-Inclination TNOs. Celestial Mechanics and Dynamical Astronomy, 132 (9). Art. No. 44. ISSN 0923-2958. doi:10.1007/s10569-020-09985-1.

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Over the course of the last decade, observations of highly inclined (orbital inclination i > 60∘) trans-Neptunian objects (TNOs) have posed an important challenge to current models of solar system formation (Levison et al. in Icarus 196(1):258–273, 2008; Nesvorný in Astron J 150:73, 2015). These remarkable minor planets necessitate the presence of a distant reservoir of strongly out-of-plane TNOs, which itself requires some dynamical production mechanism (Gladman et al. in Astron J Lett 697:L91–L94, 2009; Gomes et al. in Icarus 258:37–49, 2015; Batygin and Brown in Astrophys J 833(1):L3, 2016). A notable recent addition to the census of high-i minor bodies in the solar system is the retrograde asteroid 514107 Ka’epaoka’awela, which currently occupies a 1:-1 mean motion resonance with Jupiter at i = 163∘ (Wiegert et al. in Nature 543:687–689, 2017). In this work, we delineate a direct connection between retrograde Jupiter Trojans and high-i Centaurs. First, we backpropagate a large sample of clones of Ka’epaoka’awela for 100 Ma numerically and demonstrate that long-term stable clones tend to decrease their inclination steadily until it concentrates between 90∘ and 135∘, while their eccentricity and semi-major axis increase, placing many of them firmly into the trans-Neptunian domain. Importantly, the clones show significant overlap with the synthetic high-i Centaurs generated in Planet 9 studies (Batygin et al. in Phys Rep 805:1–53, 2019), and hint at the existence of a relatively prominent, steady-state population of minor bodies occupying polar trans-Saturnian orbits. Second, through direct numerical forward modeling, we delineate the dynamical pathway through which conventional members of the Kuiper Belt’s scattered disk population can become retrograde Jovian Trojan resonators in the presence of Planet 9.

Item Type:Article
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URLURL TypeDescription Paper ItemREBOUND Code
Köhne, Tobias0000-0002-8400-7255
Batygin, Konstantin0000-0002-7094-7908
Additional Information:© 2020 Springer. Received 14 October 2019; Revised 14 August 2020; Accepted 28 August 2020; Published 19 September 2020. We thank Nathan A. Kaib and a second anonymous reviewer for their valuable comments and suggestions for improving this manuscript. This research has made use of data and/or services provided by the International Astronomical Union’s Minor Planet Center. Simulations in this paper made use of the REBOUND code which is freely available at KB gratefully acknowledges the David and Lucile Packard Foundation and the Alfred P. Sloan Foundation for their generous support. This article is part of the topical collection on Trans-Neptunian Objects. Guest Editors: David Nesvorny and Alessandra Celletti.
Funding AgencyGrant Number
David and Lucile Packard FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Subject Keywords:Retrograde; Trojans; Centaurs; TNO
Issue or Number:9
Record Number:CaltechAUTHORS:20200908-090800444
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Official Citation:Köhne, T., Batygin, K. On the dynamical origins of retrograde Jupiter Trojans and their connection to high-inclination TNOs. Celest Mech Dyn Astr 132, 44 (2020).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105267
Deposited By: Tony Diaz
Deposited On:08 Sep 2020 16:28
Last Modified:16 Nov 2021 18:41

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