Interstellar Planetesimals: Potential Seeds for Planet Formation?

We investigate the trapping of interstellar objects during early stages star and planet formation. Our results show a very wide range possible values that will be narrowed down as population becomes better characterized. When assuming background number density 2$\cdot$10$^{15}$ pc$^{-3}$ (based on 1I/'Oumuamua detection), velocity dispersion 30 km/s an equilibrium size distribution, captured by molecular cloud expected to incorporated each protoplanetary disk its formation is O(10$^{9}$) (50 cm-5 m), O(10$^{5}$) (5 m-50 O(10$^{2}$) m-500 O(10$^{-2}$) (500 m-5 km). After formed, it could capture from ISM lifetime 6$\cdot$10$^{11}$ 2$\cdot$10$^{8}$ 6$\cdot$10$^{4}$ 20 km); in open cluster where 1% stars have undergone formation, these increase factor O(10$^{2}$-10$^{3}$). These trapped might large enough rapidly grow into larger planetesimals via direct accretion sub-cm sized dust grains before they drift due gas drag, helping overcome meter-size barrier, acting "seeds" for They should considered future models potential spread biological material across Galaxy.