The external photoevaporation of planet-forming discs

• Published in: European physical journal plus Vol. 137; no. 10; p. 1132
• Main Authors: Winter, Andrew J., Haworth, Thomas J.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 14.10.2022; Springer Nature B.V; Springer
• Subjects: Accretion disks; Applied and Technical Physics; Atomic; Complex Systems; Condensed Matter Physics; Focus Point on Environmental and Multiplicity Effects on Planet Formation; Massive stars; Mathematical and Computational Physics; Molecular; Molecular clouds; Optical and Plasma Physics; Physics; Physics and Astronomy; Planet formation; Planetary evolution; Planets; Review; Sciences of the Universe; Star & galaxy formation; Star formation; Stars; Theoretical; Ultraviolet radiation; Velocity; Wind; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics
• ISSN: 2190-5444; 2190-5444
• DOI: 10.1140/epjp/s13360-022-03314-1

Planet-forming disc evolution is not independent of the star formation and feedback process in giant molecular clouds. In particular, OB stars emit UV radiation that heats and disperses discs in a process called ‘external photoevaporation’. This process is understood to be the dominant environmental influence acting on planet-forming discs in typical star-forming regions. Our best studied discs are nearby, in sparse stellar groups where external photoevaporation is less effective. However, the majority of discs are expected to reside in much stronger UV environments. Understanding external photoevaporation is therefore key to understanding how most discs evolve, and hence, how most planets form. Here, we review our theoretical and observational understanding of external photoevaporation. We also lay out key developments for the future to address existing unknowns and establish the full role of external photoevaporation in the disc evolution and planet formation process.