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Abstract: We study the influence of an open cluster environment on the formation andcurrent structure of the Oort cloud. To do this, we have run 19 differentsimulations of the formation of the Oort Cloud for 4.5 Gyrs. In eachsimulation, the solar system spends its first 100 Myrs in a different opencluster environment before transitioning to its current field environment. Wefind that, compared to forming in the field environment, the inner Oort Cloudis preferentially loaded with comets while the Sun resides in the open clusterand that most of this material remains locked in the interior of the cloud forthe next 4.4 Gyrs. In addition, the outer Oort Cloud trapping efficiencies weobserve in our simulations are lower than previous formation models by about afactor of 2, possibly implying an even more massive early planetesimal disk.Furthermore, some of our simulations reproduce the orbits of observed extendedscattered disk objects, which may serve as an observational constraint on theSun-s early environment. Depending on the particular open cluster environment,the properties of the inner Oort Cloud and extended scattered disk can varywidely. On the other hand, the outer portions of the Oort Cloud in each of oursimulations are all similar.

Autor: Nathan A. Kaib, Thomas Quinn


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