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27 April 2024 |
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Resonance Occupation in the Kuiper Belt: Case Examples of the 5:2 and Trojan Resonances | | E. I. Chiang
; A. B. Jordan
; R. L. Millis
; M. W. Buie
; L. H. Wasserman
; J. L. Elliot
; S. D. Kern
; D. E. Trilling
; K. J. Meech
; & R. M. Wagner
; | | Date: |
22 Dec 2002 | | Journal: | Astron.J. 126 (2003) 430 | | Subject: | astro-ph | | Affiliation: | UC Berkeley), R. L. Millis, M. W. Buie, L. H. Wasserman (Lowell Observatory), J. L. Elliot, S. D. Kern (MIT), D. E. Trilling (U Penn), K. J. Meech (IfA Hawaii), & R. M. Wagner (U Arizona | | Abstract: | As part of our ongoing Deep Ecliptic Survey (DES) of the Kuiper belt, we report on the occupation of the 1:1 (Trojan), 4:3, 3:2, 7:4, 2:1, and 5:2 Neptunian mean-motion resonances (MMRs). The occupation of the 1:1 and 5:2 MMRs is not easily understood within the standard model of resonance sweeping by a migratory Neptune over an initially dynamically cold belt. Our dynamically hot, 5:2 resonant objects can librate with modest amplitudes of 90 deg within the resonance for at least 1 Gyr. Their trajectories cannot be explained by close encounters with Neptune alone, given the latter’s current orbit. The hot orbits of such 5:2 resonant KBOs, unlike hot orbits of previously known resonant KBOs, may imply that these objects were pre-heated to large inclination and large eccentricity prior to resonance capture by a migratory Neptune. Our first discovered Neptunian Trojan, 2001QR322, may not owe its existence to Neptune’s migration at all. The trajectory of 2001QR322 is remarkably stable; the object can undergo tadpole-type libration about Neptune’s leading Lagrange (L4) point for at least 1 Gyr with a libration amplitude of 24 deg. Trojan capture probably occurred while Neptune accreted the bulk of its mass. For an assumed albedo of 12--4%, our Trojan is 130--230 km in diameter. Model-dependent estimates place the total number of Neptune Trojans resembling 2001QR322 at 20--60. Their existence might rule out violent orbital histories for Neptune. | | Source: | arXiv, astro-ph/0301458 | | Services: | Forum | Review | PDF | Favorites | |
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