Abstract
This article reviews the different mechanisms affecting the orbits of trans-Neptunian objects, ranging from internal perturbations (planetary scattering, mean-motion resonances, and secular effects) to external perturbations (galactic tides and passing stars). We outline the theoretical tools that can be used to model and study them, focussing on analytical approaches. We eventually compare these mechanisms to the observed distinct populations of trans-Neptunian objects and conclude on how they participate to the sculpting of the whole distribution.
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Notes
Unpublished results described in the web page: https://www.boulder.swri.edu/~davidn/kbmmr/kbmmr.html.
For a slow scattering, the secular perturbations of the planets actually produce small oscillations of q and I, especially near \(I\approx 63^{\circ }\) and \(117^{\circ }\), as described in Sect. 4. Even without isolated mean-motion resonances, a small body can hence slowly diffuse vertically inside the chaotic volume.
In Saillenfest et al. (2016), it is written that terms of order \(\xi =\varepsilon _\mathrm {P}^{1/2}\) are neglected, instead of \(\varepsilon _\mathrm {P}^{3/2}\). Indeed, their Hamiltonian was implicitly divided by \(\varepsilon _\mathrm {P}\).
An early formation of the Oort cloud, during the planetary formation, is unlikely because gas drag prevents objects from being ejected onto such distant orbits (Brasser et al. 2007).
Objects of the classical Kuiper belt are sometimes called “Cubewanos” in reference to their first observed member, 1992 QB\(_1\), now officially named (15760) Albion. See Sect. 2 for a historical perspective.
Here again, the question of origin loses its meaning: most of the inner-Oort-cloud comets that become observable are actually first briefly transferred into the outer Oort cloud. Hence, the notion of origin largely depends on the time that we define as “time zero”.
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I thank Marc Fouchard for his support during the redaction of this review article. I am also very grateful to the two anonymous referees for their careful reading of the manuscript and their expert suggestions. This work was supported by the Programme National de Planétologie (PNP) of CNRS/INSU, co-funded by CNES.
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This article is dedicated to Giovanni B. Valsecchi.
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Saillenfest, M. Long-term orbital dynamics of trans-Neptunian objects. Celest Mech Dyn Astr 132, 12 (2020). https://doi.org/10.1007/s10569-020-9954-9
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DOI: https://doi.org/10.1007/s10569-020-9954-9