The formation of circumstellar disks is investigated using three-dimensional resistive magnetohydrodynamic simulations, in which the initial prestellar cloud has a misaligned rotation axis with respect to the magnetic field. We examine the effects of (i) the initial angle difference between the global magnetic field and the cloud rotation axis ($\theta_0$) and (ii) the ratio of the thermal to gravitational energy ($\alpha_0$). We study $16$ models in total and calculate the cloud evolution until $\sim \! 5000$ yr after protostar formation. Our simulation results indicate that an initial non-zero $\theta_0$ ($> 0$) promotes the disk formation but tends to suppress the outflow driving, for models that are moderately gravitationally unstable, $\alpha_0 \lesssim 1$. In these models, a large-sized rotationally-supported disk forms and a weak outflow appears, in contrast to a smaller disk and strong outflow in the aligned case ($\theta_0 = 0$). Furthermore, we find that when the initial cloud is highly unstable with small $\alpha_0$, the initial angle difference $\theta_0$ does not significantly affect the disk formation and outflow driving.

中文翻译：

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旋转轴与磁场错位对星盘的影响

使用三维电阻磁流体动力学模拟研究了星周盘的形成，其中初始星前云具有相对于磁场未对准的旋转轴。我们检查了 (i) 全局磁场和云旋转轴之间的初始角度差 ($\theta_0$) 和 (ii) 热能与重力能的比值 ($\alpha_0$) 的影响。我们总共研究了 $16$ 的模型并计算了云演化直到 $\sim \! 原恒星形成后每年 5000 美元。我们的模拟结果表明，初始非零 $\theta_0$ ($> 0$) 促进了盘的形成，但倾向于抑制外流驱动，对于中等重力不稳定的模型 $\alpha_0\lesssim 1$。在这些模型中，与对齐情况下的较小圆盘和强流出形成对比（$\theta_0 = 0$），形成一个大尺寸的旋转支撑盘并出现弱流出。此外，我们发现当初始云高度不稳定且 $\alpha_0$ 很小时，初始角度差 $\theta_0$ 不会显着影响盘的形成和流出驱动。