Hsi-Wei Yen (ASIAA), Bo Zhao (MPE), I-Ta Hsieh (ASIAA), Patrick Koch (ASIAA), Ruben Krasnopolsky (ASIAA), Chin-Fei Lee (ASIAA), Zhi-Yun Li (University of Virginia), Sheng-Yuan Liu (ASIAA), Nagayoshi Ohashi (NAOJ), Shigehisa Takakuwa (Kagoshima University), Ya-Wen Tang (ASIAA)
The interplay between the magnetic field, gravity, and angular momentum is one of the key parameters in the star formation processes, which determines the formation and growth of a circumstellar disk around a protostar. In this presentation, I will introduce our observational results of the magnetic field structures and gas kinematics from 6000 au to 20 au scale around the Class 0 protostar B335 obtained with JCMT, SMT, SMA, and ALMA. We have also carried out non-ideal MHD simulations of a collapsing dense core with its mass and rotational speed the same as those observed in B335. We generated synthetic polarization images and extracted velocity profiles from the simulations to compare with our observational results. Based on these comparisons, I will discuss the magnet field strength, field-matter coupling, and angular momentum transfer in the context of disk formation in B335.