We introduce a possible disruption mechanism of dust grains in planet formation by their spinning motion. This mechanism has been discussed as rotational disruption for the interstellar dust grains. We theoretically calculate whether porous dust aggregates can be disrupted by their spinning motion and whether it prohibits dust growth in protoplanetary disks. We assume radiative torque and gas-flow torque as driving sources of the spinning motion, assume that dust aggregates reach a steady-state rigid rotation, and compare the obtained tensile stress due to the centrifugal force with their tensile strength. We model the irregularly shaped dust aggregates by introducing a parameter, γ _ft, that mimics the conversion efficiency from force to torque. As a result, we find that porous dust aggregates are rotationally disrupted by their spinning motion induced by gas flow when their mass is larger than ∼10⁸ g and their volume filling factor is smaller than ∼0.01 in our fiducial model, while relatively compact dust aggregates with volume filling factor more than 0.01 do not face this problem. If we assume the dust porosity evolution, we find that dust aggregates whose Stokes number is ∼0.1 can be rotationally disrupted in their growth and compression process. Our results suggest that the growth of dust aggregates may be halted due to rotational disruption or that other compression mechanisms are needed to avoid it. We also note that dust aggregates are not rotationally disrupted when γ _ft ≤ 0.02 in our fiducial model and the modeling of irregularly shaped dust aggregates is essential in future work.

我们通过旋转运动介绍了行星形成中尘埃颗粒的可能破坏机制。这种机制已被讨论为星际尘埃颗粒的旋转破坏。我们从理论上计算了多孔尘埃聚集体是否会被它们的旋转运动破坏，以及它是否会阻止原行星盘中的尘埃生长。我们假设辐射扭矩和气流扭矩作为旋转运动的驱动源，假设灰尘聚集体达到稳态刚性旋转，并将离心力引起的拉伸应力与其拉伸强度进行比较。我们通过引入一个参数γ _{ft 来}模拟形状不规则的灰尘聚集体，这模仿了从力到扭矩的转换效率。结果，我们发现，在我们的基准模型中，当多孔尘埃聚集体的质量大于 10 ⁸ g 且体积填充因子小于 0.01时，它们会因气流引起的旋转运动而旋转破坏，而相对致密的尘埃体积填充因子大于 0.01 的骨料不会面临这个问题。如果我们假设灰尘孔隙度演化，我们会发现斯托克斯数为~0.1 的灰尘聚集体在其生长和压缩过程中会被旋转破坏。我们的结果表明，由于旋转破坏或需要其他压缩机制来避免它，灰尘聚集体的生长可能会停止。我们还注意到，当γ _ft ≤ 0.02 在我们的基准模型和不规则形状的灰尘聚集体的建模在未来的工作中是必不可少的。