Nonlinear Outcome of Coagulation Instability in Protoplanetary Disks. I. First Numerical Study of Accelerated Dust Growth and Dust Concentration at Outer Radii

Our previous linear analysis presents a new instability driven by dust coagulation in protoplanetary disks. The has the potential to concentrate grains into rings and assist planetesimal formation. In this series of papers, we perform numerical simulations investigate nonlinear outcome instability. paper (Paper I), first conduct local demonstrate existence Linear growth observed is good agreement with analysis. We next radially global that develops during inside-out disk evolution due growth. To isolate various effects on concentration growth, neglect backreaction gas fragmentation Paper I. This simplified simulation shows either or not prerequisite for via most runs weak turbulence, overcomes depletion radial drift, leading formation multiple rings. development also accelerates dimensionless stopping time $\tau_{\mathrm{s}}$ reaches unity even at outer radii (>10 au). Therefore, one promising process retain accelerate beyond drift barrier.