Interplanetary dust dynamics II. PoyntingRobertson drag and planetary perturbations on cometary dust
Abstract
A statistical analysis of a portion of the calculated orbital evolution of some 200 cometary dust particles as they spiral from just inside the orbit of Jupiter to within 0.3 AU from the Sun reveals an increase in the descent rate as calculated for drag forces alone (i.e., PoyntingRobertson drag and corpuscular drag). This increase appears when planetary perturbations are accounted for in the orbital integrations and are, at least in part, due to planetinduced orbital eccentricities leading to enlarged drag. Trajectories originating from Comet P/Encke are thought to be representative of debris from shortperiod comets due in part to a redistribution in orbital elements while the dust crossed Jupiter's orbit. Statistical methods indicate that any dependence of the increased descent rate on orbital elements other than semimajor axis and eccentricity were insignificant. There are indications that the planetinduced acceleration of the mean descent rate decreases with decreasing eccentricity. The increase in mean descent rate is only a few percent inside 1 AU; it increases to 610% in the asteroid belt and reaches 50% in the 3/1 resonance with Jupiter. By contrast, the mean rate is slower near the 4/1 Jovian commensurability than in nearby regions of phase space. An empirical relation is presented for the descent rate of cometary dust particles subjected to planetary perturbations in addition to PoyntingRobertson and corpuscular drags. The analytic expression is suitable to improve estimates of the contribution from shortperiod comets' to the zodiacal dust, and the resulting particle number density distribution.
 Publication:

Icarus
 Pub Date:
 December 1987
 DOI:
 10.1016/00191035(87)900534
 Bibcode:
 1987Icar...72..568G
 Keywords:

 Comets;
 Interplanetary Dust;
 Jupiter (Planet);
 Particle Motion;
 Planetary Orbits;
 Orbit Perturbation;
 PoyntingRobertson Effect;
 Statistical Analysis;
 COMETS;
 INTERPLANETARY DUST;
 DUST;
 DYNAMICS;
 DRAG;
 PERTURBATIONS;
 STATISTICAL ANLAYSIS;
 NUMERICAL METHODS;
 PARTICLES;
 ORBITAL ELEMENTS;
 EVOLUTION;
 ECCENTRICITY;
 TRAJECTORIES;
 ACCELERATION;
 PLANETS;
 DENSITY;
 DISTRIBUTION;
 SHORTPERIOD COMETS;
 SOURCE;
 CALCULATIONS;
 GRAVITY EFFECTS;
 Astrophysics; Miscellaneous