Formation and Evolution of Disks around Young Stellar Objects

Abstract

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 conservation of angular momentum in the parent cloud, theoretical studies instead show disk formation to be difficult from dense molecular cores magnetized to a realistic level, owing to efficient magnetic braking that transports a large fraction of the angular momentum away from the circumstellar region. We review recent progress in the formation and early evolution of disks around young stellar objects of both low-mass and high-mass, with an emphasis on mechanisms that may bridge the gap between observation and theory, including non-ideal MHD effects and asymmetric perturbations in the collapsing core (e.g., magnetic field misalignment and turbulence). We also address the associated processes of outflow launching and the formation of multiple systems, and discuss possible implications in properties of protoplanetary disks.

57 pages, Space Science Reviews, topical collection Star Formation

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Cited by in corpus (10)

• Global Three-Dimensional Simulations of Outer Protoplanetary Disks with Ambipolar Diffusion
• Zooming in on Individual Star Formation: Low- and High-mass Stars
• The Role of Outflows, Radiation Pressure, and Magnetic Fields in Massive Star Formation
• Origin of hydrogen isotopic variations in chondritic water and organics
• The Origin of the Stellar Mass Distribution and Multiplicity
• Formation and evolution of protostellar accretion discs. I. Angular-momentum budget, gravitational self-regulation, and numerical convergence
• Impact of Magnetic Braking on High-mass Close Binary Formation
• No impact of core-scale magnetic field, turbulence, or velocity gradient on sizes of protostellar disks in Orion A
• Dynamic role of dust in formation of molecular clouds
• Effect of dust rotational disruption by radiative torques on radiation pressure feedback from massive protostars