A tidal hypothesis about the origin of planetary rotation

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Planetary Evolution, Planetary Rotation, Angular Momentum, Axes Of Rotation, Gravitational Effects, Solar System, Tides

Scientific paper

It is assumed that the solar tidal action on accreting protoplanets forced them to corotation. If this is true, and assuming a subsequent conservation of spin angular momentum, one obtains a rough explanation of: (1) the actual rotation periods of the planets, (2) the trend toward small inclination angles for the rotation axes, (3) the existence of a relation between rotational angular momenta and planetary masses similar to the empirical ones due to McDonald (1964), Hartmann and Larson (1967), and Fish (1967).

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