Constructing the secular architecture of the solar system I: The giant planets

Morbidelli Alessandro (1) , Ramon Brasser (1) , Kleomenis Tsiganis (2) , Rodney Gomes (3) , Harold F. Levison (4)

1 CASSIOPEE - Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides
2 Dep. Of Physics
3 MCT
4 Department of Space Studies [Boulder]

Using numerical simulations, we show that smooth migration of the giant planets through a planetesimal disk leads to an orbital architecture that is inconsistent with the current one: the resulting eccentricities and inclinations of their orbits are too small. The crossing of mutual mean motion resonances by the planets would excite their orbital eccentricities but not their orbital inclinations. Moreover, the amplitudes of the eigenmodes characterising the current secular evolution of the eccentricities of Jupiter and Saturn would not be reproduced correctly; only one eigenmode is excited by resonance-crossing. We show that, at the very least, encounters between Saturn and one of the ice giants (Uranus or Neptune) need to have occurred, in order to reproduce the current secular properties of the giant planets, in particular the amplitude of the two strongest eigenmodes in the eccentricities of Jupiter and Saturn.

Domaines: Planétologie et astrophysique de la terre [astro-ph.EP]; Planétologie et astrophysique de la terre [astro-ph.EP]

Morbidelli Alessandro, Ramon Brasser, Kleomenis Tsiganis, Rodney Gomes, Harold F. Levison. Constructing the secular architecture of the solar system I: The giant planets. Astronomy and Astrophysics - A&A, 2009, in press. ⟨hal-00413922⟩