Paper:	Planet Formation in the Cluster Environment
Volume:	398, Extreme Solar Systems
Page:	259
Authors:	Pfaizner, S.
Abstract:	The cluster environment can influence the properties of discs around young stars. Here we investigate the influence the effect of gravitational interaction for the example of the ONC. The result is that gravitational interactions can destroy discs, especially those of massive stars. As this disc destruction around massive stars happens within ∼ 1 Myr, it is extremely unlikely that any planets around O- or B-stars are to be found. However, gravitational interactions could not only hinder planet formation but also trigger it via encounters, leading to the formation of spiral arms in discs possibly followed by the formation of giant planets by disc fragmentation.

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