Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.2003n&link_type=abstract
American Astronomical Society Meeting 208, #20.03; Bulletin of the American Astronomical Society, Vol. 38, p.101
Astronomy and Astrophysics
Astronomy
Scientific paper
Extrasolar planets have a median orbital eccentricity of approximately 0.3. Such high eccentricities are more typical of binary star systems than they are of the solar system's planets. A possible way to explain such a similarity is for the excitation process of stellar and planetary companion orbits to be the same. This is achieved by processes that are independent of the dynamics of binary and planetary formation. Stellar jets are natural candidates for exciting companion orbits because (1) they are ubiquitous features in the final stages of stellar formation and protoplanetary disk accretion. (2) A sizable number of such mass-loss processes are known to be asymmetric therefore providing a net relative acceleration to the star-companion system. (3) The magnitude of a stellar jet acceleration is independent of the companion's dynamics. (4) The direction of acceleration, being related to the star's rotation axis, is independent of the companion's orbital plane. We discuss how the accelerations associated with stellar jets (1) excite orbital eccentricities and inclinations, (2) lead to apsidal alignment in multiple planetary systems, (3) truncate protoplanetary disks and (4) force a radial migration in the outer parts of a planetary system.
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