Do Centaurs preserve their source inclinations?

Volk, Kathryn; Malhotra, Renu

doi:10.1016/j.icarus.2013.02.016

Cited by 59 publications

(48 citation statements)

References 27 publications

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“…Those bodies contribute to the influx rate of new short-period comets that may become important from the point of view of habitability, however observations of this mechanism are not yet avail-able for planetary systems other than our Kuiper belt. In the case of the solar system this mechanism may contribute to the short-period comet influx rate, in better accordance with observations (Emel'yanenko et al 2005;Volk & Malhotra 2008, 2013; this is assuming the possibility of the existence of more than ten DPs in the trans-Neptunian region. Moreover, if the formation of several tens of DPs in the outer regions of our solar system took place prior to the migration of Neptune, a vertically pre-heated debris disk could have been already present when Neptune reached its current location; such process would produce a soft mixing between: the cold CKB population, the hot CKB population, and the resonant objects (those swept during Neptune's migration).…”

Section: Discussionsupporting

confidence: 88%

Dynamical Heating Induced by Dwarf Planets on Cold Kuiper Belt–like Debris Disks

Muñoz-Gutiérrez

Pichardo

Reyes-Ruiz

et al. 2015

ApJ

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With the use of long-term numerical simulations, we study the evolution and orbital behavior of cometary nuclei in cold Kuiper belt-like debris disks under the gravitational influence of dwarf planets (DPs); we carry out these simulations with and without the presence of a Neptune-like giant planet. This exploratory study shows that in the absence of a giant planet, 10 DPs are enough to induce strong radial and vertical heating on the orbits of belt particles. On the other hand, the presence of a giant planet close to the debris disk, acts as a stability agent reducing the radial and vertical heating. With enough DPs, even in the presence of a Neptune-like giant planet some radial heating remains; this heating grows steadily, re-filling resonances otherwise empty of cometary nuclei. Specifically for the solar system, this secular process seems to be able to provide material that, through resonant chaotic diffusion, increase the rate of new comets spiraling into the inner planetary system, but only if more than the ∼ 10 known DP sized objects exist in the trans-Neptunian region.Subject headings: planets and satellites: dynamical evolution and stability -Kuiper belt: generalmethods: numerical

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Section: Discussionsupporting

confidence: 88%

Dynamical Heating Induced by Dwarf Planets on Cold Kuiper Belt–like Debris Disks

Muñoz-Gutiérrez

Pichardo

Reyes-Ruiz

et al. 2015

ApJ

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“…Although some differences in our assumptions, methods, and dynamical models can be taken into account, we believe that these estimates are in good agreement. The values obtained for τ are smaller than the typical median lifetimes of Centaurs with small inclinations (i ≤ 20 • ) (Volk & Malhotra 2013).…”

Section: Dynamical Lifetimesmentioning

confidence: 57%

Dynamical lifetimes of asteroids in retrograde orbits

Kankiewicz

Wlodarczyk²

2017

Monthly Notices of the Royal Astronomical Society

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The population of known minor bodies in retrograde orbits (i > 90 • ) that are classified as asteroids is still growing. The aim of our study was to estimate the dynamical lifetimes of these bodies by use of the latest observational data, including astrometry and physical properties. We selected 25 asteroids with the best determined orbital elements. We studied their dynamical evolution in the past and future for ± 100 My (± 1 Gy for three particular cases).We first used orbit determination and cloning to produce swarms of test particles. These swarms were then input into long-term numerical integrations and orbital elements were averaged. Next, we collected the available thermal properties of our objects and used them in an enhanced dynamical model with Yarkovsky forces. We also used a gravitational model for comparison. Finally, we estimated the median lifetimes of 25 asteroids.We found three objects whose retrograde orbits were stable with a dynamical lifetime τ ∼ 10 ÷ 100 My. A large portion of the objects studied displayed smaller values of τ (τ ∼ 1 My). In addition, we studied the possible influence of the Yarkovsky effect on our results.We found that the Yarkovsky effect can have a significant influence on the lifetimes of asteroids in retrograde orbits. Due to the presence of this effect, it is possible that the median lifetimes of these objects are extended. Additionally, the changes in orbital elements, caused by Yarkovsky forces, appear to depend on the integration direction. To explain this more precisely, the same model based on new physical parameters, determined from future observations, will be required.

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“…The most unexpected recent result was that retrograde resonances are more efficient at orbital capture than prograde resonances (Namouni & Morais (2015) hereafter Paper I). For the Centaurs inherently chaotic orbits that wander radially between the planets to be captured then released from mean motion resonances (Bailey & Malhotra 2009;Volk & Malhotra 2013), the efficiency of retrograde resonance capture suggests that the dynamical lifetimes of Centaurs and Damocloids on retrograde orbits are probably the largest of their kind in the solar system. This conclusion about the efficiency of retrograde reso-⋆ E-mail: namouni@obs-nice.fr (FN) ; helena.morais@rc.unesp.br (MHMM) nances was established in Paper I using large scale simulations (nearly 6 × 10 5 ) by setting up massless particles that interact with a Jupiter mass planet while they drift radially under the effect of a Stokes-type friction force with a characteristic timescale of 10 5 planetary orbits (1.2 × 10 6 years).…”

Section: Introductionmentioning

confidence: 99%

Resonance capture at arbitrary inclination – II. Effect of the radial drift rate

Namouni¹,

Morais²

2017

Monthly Notices of the Royal Astronomical Society

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The effect of radial drift rate on mean motion resonance capture is studied for prograde, polar and retrograde orbits. We employ the numerical framework of our earlier exploration of resonance capture at arbitrary inclination. Randomly constructed samples of massless particles are set to migrate radially from outside the orbit of a Jupiter-mass planet at different drift rates totalling more than 1.6 × 10 6 numerical simulations. Slower drift rates reduce overall capture probability especially for prograde orbits and enhance capture at specific initial inclinations of high order resonances such as the outer 1:5, 1:4, 1:3, 2:5, 3:7, 5:7. Global capture is reduced with increasing eccentricity at all inclinations as high order resonances capture more particles that are subsequently lost by disruptive close encounters with the planet. The relative efficiency of retrograde resonances at long-lived capture with respect to prograde resonances is explained by the reduced effect of planet encounters as such events occur with a shorter duration and a higher relative velocity for retrograde motion. Capture in the coorbital 1:1 resonance is marginally affected by the radial drift rate except for nearly coplanar retrograde eccentric orbits whose capture likelihood is increased significantly with slower drift rates. An unexpected finding is the presence of a dynamical corridor for capture in high order inner prograde resonances with initial inclinations in the range [50 • ,80 • ] especially at the inner 5:2 resonance whose capture likelihood peaks at 80% to 90% depending on initial eccentricity.

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Do Centaurs preserve their source inclinations?

Cited by 59 publications

References 27 publications

Dynamical Heating Induced by Dwarf Planets on Cold Kuiper Belt–like Debris Disks

Dynamical Heating Induced by Dwarf Planets on Cold Kuiper Belt–like Debris Disks

Dynamical lifetimes of asteroids in retrograde orbits

Resonance capture at arbitrary inclination – II. Effect of the radial drift rate

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