Other
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.4706p&link_type=abstract
American Astronomical Society, DPS meeting #41, #47.06
Other
Scientific paper
Both Neptune Trojans and Plutinos are protected from close encounter with Neptune since they are trapped in 1:1 and 3:2 mean motion resonances with the planet, respectively. Nonetheless, the orbital configuration of these two families of Kuiper Belt Objects suggests they may collide frequently between each other. Our analysis of colors and sizes of Plutinos shows an absence of large objects at low orbital inclination values and also a large proportion of small blue (neutral) objects equally spread among the orbital inclination ranges of this family. The few colors and size estimations of Neptune Trojans available show to be as blue (neutral) as the Plutinos in the same size range. We analyze the most favorable conditions for close encounters / collisions between the two families in question to occur. Assuming those collisions can be disruptive, creating smaller objects not necessarily with similar colors as their progenitors had, we address if there could be a link between collisions and the observed size and color patterns of the aforementioned families.
From simultaneous numerical simulations of the outer Solar System over 1 Gyr for all these bodies we conclude that the orbital overlap between Neptune Trojans and Plutinos is favored for Plutinos with high libration amplitudes, high eccentricities and low inclinations. A crude collisional analysis hints that the observed high concentration of small Plutinos at low inclinations could be a consequence of a collisional interaction with Neptune Trojans. Previous works on the collision rates between Plutinos and other non-trojan KBOs did show a somewhat constant collision rate with inclination among Plutinos, hence collisions with Neptune Trojans could be the (missing) asymmetry factor.
Almeida J. C. Á.
Correia Alexandre C. M.
Peixinho Nuno
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