Possible Behavior of the Uranus' Satellites During the Resonant Planetary Migration

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According to Tsiganis et al. 2005 (Nature 435, 459-461), in the Nice model, the regular satellites of the giant planets would be immune under the effects of the planetary migration while the primordial irregular ones would not resist. As far we know, a clear demonstration of that is not yet presented. In this work (Deienno et al. A&A submitted) we study this problem, in special for the case of Uranus’ system. We use the code developed by Gomes et al. 2005 (Nature 435, 466-469) and also considered the effect of the Sun and of the oblateness of the host planet. Our test bodies are the known regular satellites and some fictitious satellites placed beyond Oberon. All these satellites interact each other. The disturbance of the planetesimal disk and of the giant planets are also taken into account. In this way, we investigate the possibility of the existence of a limit distance such that satellites within this limit, resist the instabilities of the planetary migration. The statistic of our numerical simulations shows that Oberon is the outermost (last) regular satellite that resist to the planetary migration. Therefore, in general the irregular objects do not resist the planetary migration. On the other hand, the simulations also show that although the current regular satellites are indeed primordial, eventually, some significant instabilities can occur in their region, leading to a possible ejection of some regular satellite. As a natural result of several encounters, some captures of the irregular satellites occur. In this sense, a brief study of the captured satellites is shown.
Acknowledgements: FAPESP and CNPq for financial support.

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