[O i] 6300 Å emission as a probe of external photoevaporation of protoplanetary discs

• DOI: 10.1093/mnras/stac3467
• Publication Date: 2022-11-28T22:50:44Z
• Authors: Giulia Ballabio; Thomas J Haworth; W J Henney
• Keywords: Photoevaporation; Orion Nebula; Line (geometry)

We study the utility of [OI] 6300$\mathring{\mathrm A}$ forbidden line for identifying and interpreting externally driven photoevaporative winds in different environments at a range distances. Thermally excited is well known tracer inner disc winds, so any external contribution needs to be distinguishable. In not thermally instead results from dissociation OH we how luminosity resulting that process scales with disc/environmental parameters. find increases dramatically FUV radiation field strength above around 5000 G$_0$. The predicted luminosities our models are consistent measurements proplyds Orion Nebula Cluster. high strong UV alone may act as diagnostic, but rise [OI]-to-accretion ratio better separate two contributions. This could provide means photoevaporation distant clusters where proplyd morphology evaporating discs cannot spatially resolved.