Context. Planets form in the disks surrounding young stars. The time at which the planet
formation process begins is still an open question. Annular substructures such as rings and …

Spirals and streamers are the hallmarks of mass accretion during the early stages of star
formation. We present the first observations of a large-scale spiral and a streamer towards a …

We perform a three-dimensional nonideal magnetohydrodynamic simulation of a strongly
magnetized cloud core and investigate the complex structure caused by the interchange …

We perform a long-term simulation of star and disk formation using three-dimensional non-
ideal magnetohydrodynamics. The simulation starts from a prestellar cloud and proceeds …

The first step in planet formation is the collisional growth of dust grains in the circumstellar
disk. Recent observations suggest the existence of grown dust in protostellar systems during …