Oral Presentation

Increasing mass-to-flux ratio from the dense core to the protostellar envelope around the Class 0 protostar HH211

Author(s): Hsi-Wei Yen (ASIAA), Patrick Koch (ASIAA), Chin-Fei Lee (ASIAA), Naomi Hirano (ASIAA), Nagayoshi Ohashi (ASIAA), Jinshi Sai (ASIAA), Shigehisa Takakuwa (Kagoshima U./ASIAA), Ya-Wen Tang (ASIAA), Ken’ichi Tatematsu (NAOK/SOKENDAI), Bo Zhao (McMaster U.)

Presenter: Hsi-Wei Yen (ASIAA)

we analyzed the single-dish and ALMA polarization and line data of the Class 0 protostar HH 211, and estimated the magnetic field strength in the dense core using the DCF method and that in the protostellar envelope from the force balance between the gravity and magnetic field tension. Our results suggest that the mass-to-flux ratio increases by more than a factor of two from the dense core to the protostellar envelope, and hint at efficient ambipolar diffusion in the protostellar envelope, which could enable the formation of the 20 au Keplerian disk in HH 211.