An observational review is provided of the properties of accretion disks around young stars.
It concerns the primordial disks of intermediate-and high-mass young stellar objects in …

Recent observations have suggested that circumstellar disks may commonly form around
young stellar objects. Although the formation of circumstellar disks can be a natural result of …

The enormous radiative and mechanical luminosities of massive stars impact a vast range of
scales and processes, from the reionization of the universe, to the evolution of galaxies, to …

The formation of stars above about 20 M⊙ and their apparently high multiplicity remain
heavily debated subjects in astrophysics. We have performed a vast high-resolution radial …

High-mass protostars (M⋆> 8 M⊙) are thought to gain the majority of their mass via short,
intense bursts of growth. This episodic accretion is thought to be facilitated by gravitationally …

Solar-mass stars form via disk-mediated accretion. Recent findings indicate that this process
is probably episodic in the form of accretion bursts, possibly caused by disk fragmentation …

Context. Class II methanol masers are signposts of massive young stellar objects (MYSOs).
Recent evidence shows that flares of these masers are driven by MYSO accretion bursts …

Stellar feedback is needed to produce realistic giant molecular clouds and galaxies in
simulations, but due to limited numerical resolution, feedback must be implemented using …

Context. Massive stars form in magnetized and turbulent environments and are often located
in stellar clusters. The accretion and outflows mechanisms associated with forming massive …

The formation process of massive stars is not well understood, and advancement in our
understanding benefits from high-resolution observations and modelling of the gas and dust …