Tilting Jupiter (a bit) and Saturn (a lot) During Planetary Migration
David Vokrouhlicky, David Nesvorny

TL;DR
This study investigates how late planetary migration influenced the obliquities of Jupiter and Saturn, suggesting resonant crossings during migration shaped their current axial tilts, with implications for early Solar System dynamics.
Contribution
It demonstrates that Jupiter's and Saturn's obliquities were likely excited by crossing specific spin-orbit resonances during planetary migration, providing constraints on migration history.
Findings
Jupiter's obliquity may result from crossing the s8 resonance.
Saturn's large obliquity likely due to capture into the s8 resonance.
Resonance crossing constrains early planetary migration models.
Abstract
We study the effects of planetary late migration on the gas giants obliquities. We consider the planetary instability models from Nesvorny & Morbidelli (2012), in which the obliquities of Jupiter and Saturn can be excited when the spin-orbit resonances occur. The most notable resonances occur when the and frequencies, changing as a result of planetary migration, become commensurate with the precession frequencies of Jupiter's and Saturn's spin vectors. We show that Jupiter may have obtained its present obliquity by crossing of the resonance. This would set strict constrains on the character of migration during the early stage. Additional effects on Jupiter's obliquity are expected during the last gasp of migration when the resonance was approached. The magnitude of these effects depends on the precise value of the Jupiter's precession constant. Saturn's large…
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Taxonomy
TopicsAstro and Planetary Science · Geomagnetism and Paleomagnetism Studies · Stellar, planetary, and galactic studies
