Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1127m&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 96, Sept. 1988, p. 1127-1135.
Astronomy and Astrophysics
Astronomy
9
Encounters, Solar Orbits, Solar System, Stellar Gravitation, Gravitational Effects, Neptune (Planet), Orbit Perturbation, Orbital Velocity, Solar Planetary Interactions, Stellar Mass
Scientific paper
A close stellar passage would have perturbed the Jovian planets into inclined, eccentric orbits. The low inclinations and eccentricities of the present orbits imply that no such passage has taken place since the formation of our planetary system and dissipation of the planetary nebula. Several consequences follow: (1) The orbital inclination i and eccentricity e of the outer planets are relics of the early solar system, and need to be explained by theories of planetary system formation. (2) The present boundary of the planetary system was primordial and not the result of stripping of planets in larger orbits. (3) No weakly bound object, such as the suggested solar companion Nemesis, has passed through the planetary system. However, a companion in a moderately eccentric orbit with perihelion well outside the planetary system is not ruled out.
Morris Donald E.
O'Neill Thomas G.
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