Abstract
ABSTRACT We examine the evolution of Jupiter's orbit as the Sun evolves to form a planetary nebula. We use an orbital synchronization mechanism, that was proposed by Tassoul (1987), and find that Jupiter is likely to deposit a substantial fraction of its orbit angular momentum, in spinning-up the Sun, when the latter is on the upper AGB. This amount of angular momentum is likely to cause some small degree of axisymmetric mass loss from the Sun. In this case, the Sun will form an elliptical planetary nebula. The formation of elliptical planetary nebulae with the influence of massive planets and small dwarfs, may explain the large fraction of elliptical planetary nebulae among the total number of planetary nebulae known today.
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