Author:
Anton Kochergin 

Title:
Modeling of slowly ejected small dust particles

Abstract
We model the motion of dust particles ejected from 
a cometary nucleus at low velocities that are below 
the escape velocity. We find that despite the low-velocity 
ejection a considerable part of dust particles loses 
their gravitational ties with the nucleus because 
of solar-radiation pressure.
Simultaneously, the particles that fall back onto the nucleus 
could get transported a significant distance from their place 
of origin. At small heliocentric distances, ~1 au, the radiation 
pressure similarly affects the motion of dust particles regardless 
of their chemical composition. At longer solar distances, >4 au, 
dust particles having predominantly carbonaceous composition get 
swept away more efficiently compared to the silicate particles; 
whereas, the latter particles tend to fall back onto the nucleus 
forming a crust refractory layer depleted of carbonaceous materials.