SPEED LIMIT ON NEPTUNE MIGRATION IMPOSED BY SATURN TILTING
- Astronomie et Systemes Dynamiques, IMCCE-CNRS UMR8028, Observatoire de Paris, UPMC, 77 Av. Denfert-Rochereau, 75014 Paris (France)
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 timescale {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 deg. to 1 deg. We also give an algorithm to know if Saturn can be tilted for any migration law.
- OSTI ID:
- 21333784
- Journal Information:
- Astrophysical Journal (Online), Vol. 702, Issue 1; Other Information: DOI: 10.1088/0004-637X/702/1/L19; Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-4357
- Country of Publication:
- United States
- Language:
- English
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