Perturbations on Regular Satellites as Consequences of the Planetary Migration

Details Perturbations on Regular Satellites as Consequences of the Planetary Migration Perturbations on Regular Satellites as Consequences of the Planetary Migration

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....40.1903y&link_type=abstract

American Astronomical Society, DPS meeting #40, #19.03; Bulletin of the American Astronomical Society, Vol. 41, p.557

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It is well agreed that during the planetary migration, many close encounters happened between the planets. As a by product, the satellites of these planets certainly underwent significant changes. Many of them were ejected while others suffered non-negligible perturbations. Besides that, another source of instability was the close encounter between a massive planetesimal and a planet. This kind of event occurred much more often and the main effect on a satellite depends on the number of planet-sized planetesimals in the disk.
Beaugé et al (2002) found that these close encounters may excite significantly, not only the irregular satellites, but also those close to the mother planet. With modern and more compact migration models, these results should be even more enhanced (Nogueira, 2008). In this work we study the long-term dynamics of these objects, i.e. those originally close to the planet, which were disturbed as said before. Regarding to the stability, we show, analytically, the determinant role played by the oblateness. In the case when the obliquity of the planet is negligible, through the averaged system we identify a generalized Kozai-Lidov resonance which is very efficient to destabilize an initially circular but inclined close satellite. If obliquity is non-negligible, several resonances are shown to be very important due to the combined effect of the Sun and the oblateness. This scenario shortens the lifetime of such objects.
Acknowledgement: T. Yokoyama thanks FAPESP and CNPQ for financial support.

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