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We investigated the formation of arc-like structures in the infallingenvelope around protostars, motivated by the recent Atacama LargeMillimeter/Submillimeter Array (ALMA) observations of the high-densitymolecular cloud core, MC27/L1521F. We performed self-gravitationalhydrodynamical numerical simulations with an adaptive mesh refinement code. Afilamentary cloud with a 0.1~pc width fragments into cloud cores because ofperturbations due to weak turbulence. The cloud core undergoes gravitationalcollapse to form multiple protostars, and gravitational torque from theorbiting protostars produces arc structures extending up to a 1000~AU scale. Aswell as on a spatial extent, the velocity ranges of the arc structures,$\sim0.5\,\mathrm{km\,s}^{-1}$, are in agreement with the ALMA observations. Wealso found that circumstellar disks are often misaligned in triple system. Themisalignment is caused by the tidal interaction between the protostars whenthey undergo close encounters because of a highly eccentric orbit of the tightbinary pair.

An origin of arc structures deeply embedded in dense molecular cloud cores