Solar influence on planetary evolution

Details Solar influence on planetary evolution Solar influence on planetary evolution

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978obs....98...19h&link_type=abstract

The Observatory, vol. 98, Feb. 1978, p. 19-22.

Physics

1

Planetary Evolution, Solar Activity Effects, Solar System, Cosmology, Elliptical Orbits, Solar Orbits, Terrestrial Planets

Scientific paper

A necessary (but not sufficient) condition for equilibrium of a protoplanet is derived. Stability limits for protoplanets with a mass of 10 to the 30th power g, a mean molecular weight of 16/15, and represented by polytropes with an index of 3/2 are examined for the cases of present-day, T Tauri-phase, and flare-phase energy output from the sun. The results obtained show that any 'standard' protoplanet lying within the terrestrial-planet region would have been tidally disrupted. Two alternative scenarios of planetary formation are considered, including one in which all protoplanets that evolved into planets were originally moving in elliptical orbits in the outer parts of the solar system.

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