also if Saturn initially migrated rapidly from further away. We also explore the possibility of trapping in other resonances, and the subsequent evolutions. We discuss the compatibility of our results with the initial conditions adopted in Tsiganis et al. (2005) and Gomes et al. (2005) to explain the current orbital architecture of the giant planets and the origin of the Late Heavy Bombardment of the Moon.'
author:
- '**Alessandro Morbidelli**'
- '**Aurélien Crida**'
- 
- |
    Corresponding author:\
    Alessandro Morbidelli\
    OCA\
    B.P. 4229\
    06304 Nice Cedex 4, France\
    email: morby@obs-nice.fr
title: 'The dynamics of Jupiter and Saturn in the gaseous proto-planetary disk'
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Introduction
============

The general theory of planet-gas disk interactions (see for instance Lin and Papaloizou, 1979; Goldreich and Tremaine, 1980; Papaloizou and Lin, 1984; Lin and Papaloizou, 1986; Ward, 1986, 1997) predicts a systematic migration of the planets towards the central star. This prediction received a spectacular confirmation with the discovery of the first extra-solar planets, on orbits with semi-major axes comparable to or smaller than those of the terrestrial planets in our Solar System (the so-called hot and warm Jupiters).

Despite planet migration is undoubtedly a fact, it is not a general rule, or -at least- 