Tilting Saturn. II. Numerical Model
@article{Hamilton2004TiltingSI, title={Tilting Saturn. II. Numerical Model}, author={Douglas P. Hamilton and William Rankin. Ward}, journal={The Astronomical Journal}, year={2004}, volume={128}, pages={2510 - 2517} }
We argue that the gas giants Jupiter and Saturn were both formed with their rotation axes nearly perpendicular to their orbital planes, and that the large current tilt of the ringed planet was acquired in a post-formation event. We identify the responsible mechanism as trapping into a secular spin-orbit resonance that couples the angular momentum of Saturn's rotation to that of Neptune's orbit. Strong support for this model comes from (1) a near-match between the precession frequencies of…
62 Citations
Tilting Saturn. I. Analytic Model
- Physics, Geology
- 2004
The tilt of Saturn's spin axis to its orbit plane is 26.°7, while that of Jupiter is only 3.°1. We offer an explanation for this puzzling difference owing to gravitational perturbations of Saturn by…
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The migration and encounter histories of the giant planets in our solar system can be constrained by the obliquities of Jupiter and Saturn. We have performed secular simulations with imposed…
Tilting Ice Giants with a Spin–Orbit Resonance
- Physics, GeologyThe Astrophysical Journal
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Giant collisions can account for Uranus’s and Neptune’s large obliquities, yet generating two planets with widely different tilts and strikingly similar spin rates is a low-probability event.…
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- Physics, GeologyThe Astrophysical Journal
- 2020
Large planetary spin–orbit misalignments (obliquities) may strongly influence atmospheric circulation and tidal heating in a planet. A promising avenue to generate obliquities is via spin–orbit…
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- Geology, PhysicsNature Astronomy
- 2021
The obliquity of a planet is the tilt between its equator and its orbital plane. Giant planets are expected to form with near-zero obliquities1,2. After the formation of Saturn, some dynamical…
Tilting Styx and Nix but not Uranus with a Spin-Precession-Mean-motion resonance
- Physics, GeologyCelestial mechanics and dynamical astronomy
- 2018
A Hamiltonian model is constructed for the spin axis of a planet perturbed by a nearby planet with both planets in orbit about a star and explains how Styx and Nix can be tilted to high obliquity via outward migration of Charon.
TILTING JUPITER (A BIT) AND SATURN (A LOT) DURING PLANETARY MIGRATION
- Geology, Physics
- 2015
We study the effects of planetary late migration on the gas giants’ obliquities. We consider the planetary instability models from Nesvorný and Morbidelli, in which the obliquities of Jupiter and…
Signatures of Obliquity in Thermal Phase Curves of Hot Jupiters
- Physics, GeologyThe Astronomical Journal
- 2019
Recent work suggests that many short-period extrasolar planets may have spin obliquities that are significantly tilted with respect to their orbital planes. These large obliquities are a natural…
Obliquity-driven sculpting of exoplanetary systems
- Physics, GeologyNature Astronomy
- 2019
NASA’s Kepler mission revealed that ~30% of Solar-type stars harbour planets with sizes between that of Earth and Neptune on nearly circular and coplanar orbits with periods less than 100 days1–4.…
SPEED LIMIT ON NEPTUNE MIGRATION IMPOSED BY SATURN TILTING
- Geology, Physics
- 2009
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…
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