5:15 PM - 6:30 PM
[PPS11-P27] Streaming instability in the dust layer of a protoplanetary disk
The gravitational instability occurs when the dust density exceeds a critical value. However, dust layer is believed to be in turbulent state, the layer would be dissipated.The streaming instability (Johansen & Youdin 2007) due to velocity shear between gas and dusts in the radial direction in the dust settling layer is a candidate to overcome this issue since the dust density increases locally even in the turbulent state.
We study the streaming instability by using hybrid simulations, where gas and dusts are treated as fluid and particles, respectively, and the dust-to-gas mass ratio is set to be ~1.
We show the time history of the maximum dust density due to the instability in the dust layer.