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The 5:1 Neptune Resonance as Probed by CFEPS: Dynamics and Population | R. E. Pike
; J. J. Kavelaars
; J. M. Petit
; B. J. Gladman
; M. Alexandersen
; K. Volk
; C. J. Shankman
; | Date: |
30 Apr 2015 | Abstract: | The Canada-France Ecliptic Plane Survey discovered four trans-Neptunian
objects with semi-major axes near the 5:1 resonance, revealing a large and
previously undetected intrinsic population. Three of these objects are
currently resonant with Neptune, and the fourth is consistent with being an
object that escaped the resonance at some point in the past. The non-resonant
object may be representative of a detached population that is stable at
slightly lower semi-major axes than the 5:1 resonance. We generated clones of
these objects by resampling the astrometric uncertainty and examined their
behavior over a 4.5 Gyr numerical simulation. The majority of the clones of the
three resonant objects (>90%) spend a total of 10^7 years in resonance during
their 4.5 Gyr integrations; most clones experience multiple periods of
resonance capture. Our dynamical integrations reveal an exchange between the
5:1 resonance, the scattering objects, and other large semi-major axis
resonances, especially the 4:1, 6:1, and 7:1. The multiple capture events and
relatively short resonance lifetimes after capture suggest that these objects
are captured scattering objects that stick in the 5:1 resonance. These 5:1
resonators may be representative of a temporary population, requiring regular
contributions from a source population. We examined the dynamical
characteristics (inclination, eccentricity, resonant island, libration
amplitude) of the detected objects and their clones in order to provide an
empirical model of the orbit structure of the 5:1 resonance. This resonance is
dynamically hot and includes primarily symmetric librators. Given our orbit
model, the intrinsic population necessary for the detection of these three
objects in the 5:1 resonance is 1900(+3300 -1400, 95% confidence) with H_g< 8
and e > 0.5. | Source: | arXiv, 1504.8041 | Services: | Forum | Review | PDF | Favorites |
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