Minimal Energy Transfer of Solid Material Between Planetary Systems

Details Minimal Energy Transfer of Solid Material Between Planetary Systems Minimal Energy Transfer of Solid Material Between Planetary Systems

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dda....40.0205b&link_type=abstract

American Astronomical Society, DDA meeting #40, #2.05; Bulletin of the American Astronomical Society, Vol. 41, p.895

Mathematics

Probability

Scientific paper

Planet formation leaves behind a swarm of small bodies of different sizes, from dust particles to asteroid- and KBO-like objects. Evidence of the presence of these planetesimals around stars other than the Sun are the debris disks left behind likely generated from planetesimals collisions. Here we explore a mechanism that allows the transfer of planetesimals between planetary systems. In particular, we examine a dynamical process that yields very low escape velocities ( 0.1 km/s) using nearly parabolic trajectories, and the reverse process that allows for low velocity capture. These processes are chaotic and provide a mechanism for minimal energy transfer that yield an increased transfer probability compared to that of previously studied mechanisms that have invoked hyperbolic trajectories. We estimate the transfer probability when the source and target stars are still embedded in a stellar cluster as a function of stellar mass and cluster size. We find that significant amounts of solid material could potentially have been transferred from the early Solar System to our nearest neighbor stars before the maternal cluster dispersed. The estimated number of weak transfer events depends strongly on the planetesimal size distribution.

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