Topic: young stars

Gas disks around young stars transport material inward while providing the environment for planet formation. This lecture reviews their origin and evolution, including spectroscopic evidence of stellar accretion. It compares viscous-disk models with descriptions that incorporate magnetic fields and the structures they produce.

Young stars eject powerful flows while they are still forming. This seminar reviews their observed properties and competing explanations for their origin. High-resolution observations from Hubble, Webb, ALMA and NOEMA reveal new structure and help evaluate how these outflows influence both stellar growth and planet-forming environments.