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Planetesimal Formation in a Pressure Bump
In this simulation, which was done as part of Carrera et al. 2020, particles drift toward the star and encounter a pressure bump (centered on x = 0, but due to the background pressure gradient, the point of minimum drift is around x = -1.2H). The particles slow down as they enter the minimum drift point, which causes their local density to increase, pushing them into the streaming unstable regime. Planetesimal formation follows soon thereafter.