A tidal hypothesis about the origin of planetary rotation |
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Authors: | Paolo Farinella Paolo Paolicchi Annam Nobili |
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Institution: | (1) Osservatorio Astronomico di Brera, Merate (Como), Italy;(2) Instituto di Scienze dell'Informazione, dell'Università di Pisa, Pisa, Italy |
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Abstract: | We assume 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, we can easily get 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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