The capture of interstellar comets

Details The capture of interstellar comets The capture of interstellar comets

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255..307v&link_type=abstract

Astrophysical Journal, Part 1, vol. 255, Apr. 1, 1982, p. 307-315. Research supported by the Natural Sciences and Engineering R

Astronomy and Astrophysics

Astrophysics

27

Capture Effect, Comets, Orbit Calculation, Particle Interactions, Solar System, Stellar Mass Ejection, Binary Stars, Chemical Evolution, Galactic Evolution, Interstellar Matter, Numerical Integration, Oort Cloud, Protostars, Solar Orbits, Comets, Capture, Orbits, Velocity, Distribution, Origin, Oort Cloud, Solar System, Dynamics, Procedure, Mathematical Models, Data, Energy, Experiments, Parameters, Aphelion, Inclinations, Theoretical Studies, Hypotheses

Scientific paper

A large number of numerical orbit integrations of particles interacting with the Sun-Jupiter system have been performed in order to derive for the first time, empirical, velocity-dependent expressions for the capture cross section of the system. By integrating these with appropriate velocity distribution functions, bounds can be set on whether comets can be of interstellar origin. These indicate that a significant accumulation of interstellar comets into an 'Oort cloud' could occur only with a prolonged transit of the solar system through a relatively large, dense cloud of interstellar debris (comets) having a mean internal velocity dispersion of approximately 1.0 km/s and at a relative velocity not exceeding 0.5 km/s. At these levels, a significant antisymmetry of cometary aphelia in the direction of the relative solar motion is also to be expected. Finally, it is pointed out that suitable binary stars must be exceedingly efficient traps for both protostellar and interstellar debris.

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