A quarter of a century ago, philosopher Judith called upon society to create “gender trouble”
by disrupting the binary view of sex, gender, and sexuality. She argued that gender, rather …

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 …

Context. Water is a key molecule in the physics and chemistry of star and planet formation,
but it is difficult to observe from Earth. The Herschel Space Observatory provided …

Context. Star formation takes place in giant molecular clouds, resulting in mass-segregated
young stellar clusters composed of Sun-like stars, brown dwarfs, and massive O-type (50 …

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 …

Aims. We present the first simulations of the formation and feedback of massive stars which
account for radiation forces as well as photoionization feedback (along with protostellar …

Context. High-mass stars and star clusters commonly form within hub-filament systems.
Monoceros R2 (hereafter Mon R2), at a distance of 830 pc, harbors one of the closest of …

Context. There is growing evidence that massive stars grow by disk accretion in a similar
way to their low-mass counterparts. Early in evolution, these disks can achieve masses that …

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 …

Accretion-driven luminosity outbursts are a vivid manifestation of variable mass accretion on
to protostars. They are known as the so-called FU Orionis phenomenon in the context of low …