Speed limit on Neptune migration imposed by Saturn tilting

Details Speed limit on Neptune migration imposed by Saturn tilting Speed limit on Neptune migration imposed by Saturn tilting

2009-09-02

arxiv.org/abs/0909.0332v1

ApJL 702 (2009), L19-L22

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

5 pages, 4 figures, published in ApJL

Scientific paper

10.1088/0004-637X/702/1/L19

In this Letter, we give new constraints on planet migration. They were obtained under the assumption that Saturn's current obliquity is due to a capture in resonance with Neptune's ascending node. If planet migration is too fast, then Saturn crosses the resonance without being captured and it keeps a small obliquity. This scenario thus gives a lower limit on the migration time scale tau. We found that this boundary depends strongly on Neptune's initial inclination. For two different migration types, we found that tau should be at least greater than 7 Myr. This limit increases rapidly as Neptune's initial inclination decreases from 10 to 1 degree. We also give an algorithm to know if Saturn can be tilted for any migration law.

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