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IoA_Seminar

No. 367: 13 April 2021 (Tue) 16:15 - 17:15†

Speaker: 平野 信吾（東京大学理学系研究科天文学教室）／Shingo Hirano (Department of Astronomy, the University of Tokyo)†

Title: The Effect of Misalignment between the Rotation Axis and Magnetic Field on the Circumstellar Disk†

Language: English

Abstract:

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 and (ii) the ratio of the thermal to gravitational energy. We study 16 models in total and calculate the cloud evolution until ∼5000 yr after protostar formation. Our simulation results indicate that an initial nonzero promotes disk formation but tends to suppress outflow driving for models that are moderately gravitationally unstable. 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.

(This talk will be given online. Details will be announced via e-mail.)