| Full text | |
| Author(s): |
Total Authors: 4
|
| Affiliation: | [1] SW Res Inst, Boulder, CO - USA
[2] Charles Univ Prague, Inst Astron, Prague - Czech Republic
[3] Univ Estadual Paulista, Rio Claro, SP - Brazil
Total Affiliations: 3
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| Document type: | Journal article |
| Source: | ASTRONOMICAL JOURNAL; v. 148, n. 2 AUG 2014. |
| Web of Science Citations: | 18 |
| Abstract | |
The Nice model of the dynamical instability and migration of the giant planets can explain many properties of the present solar system, and can be used to constrain its early architecture. In the jumping-Jupiter version of the Nice model, required from the terrestrial planet constraint and dynamical structure of the asteroid belt, Jupiter has encounters with an ice giant. Here, we study the survival of the Galilean satellites in the jumping-Jupiter model. This is an important concern because the ice-giant encounters, if deep enough, could dynamically perturb the orbits of the Galilean satellites and lead to implausible results. We performed numerical integrations where we tracked the effect of planetary encounters on the Galilean moons. We considered three instability cases from Nesvorny \& Morbidelli that differed in the number and distribution of encounters. We found that in one case, where the number of close encounters was relatively small, the Galilean satellite orbits were not significantly affected. In the other two, the orbital eccentricities of all moons were excited by encounters, Callisto's semimajor axis changed, and, in a large fraction of trials, the Laplace resonance of the inner three moons was disrupted. The subsequent evolution by tides damps eccentricities and can recapture the moons in the Laplace resonance. A more important constraint is represented by the orbital inclinations of the moons, which can be excited during the encounters and not appreciably damped by tides. We find that one instability case taken from Nesvorny \& Morbidelli clearly does not meet this constraint. This shows how the regular satellites of Jupiter can be used to set limits on the properties of encounters in the jumping-Jupiter model, and help us to better understand how the early solar system evolved. (AU) | |
| FAPESP's process: | 10/11109-5 - Satellites of Saturn: Stability, Capture and Analysis of the Excitations on the Eccentricity and Inclination of the Regular Satellites During the Planetary Migration |
| Grantee: | Rogerio Deienno |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 12/23732-4 - Capture of irregular satellites during the planetary migration |
| Grantee: | Rogerio Deienno |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |