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2010MNRAS.406.1553E - Mon. Not. R. Astron. Soc., 406, 1553-1569 (2010/August-2)
Theoretical spectra of photoevaporating protoplanetary discs: an atlas of atomic and low-ionization emission lines.
ERCOLANO B. and OWEN J.E.
Abstract (from CDS):
Our models compare favourably with currently available observations, lending support to an X-ray driven photoevaporation model for disc dispersal. In particular, we find that X-rays drive a warm, predominantly neutral flow where the Oi 6300 Å line can be produced by neutral hydrogen collisional excitation. Our models can, for the first time, provide a very good match to both luminosities and profiles of the low-velocity component of the Oi 6300 Å line and other forbidden lines observed by Hartigan et al., which covered a large sample of T-Tauri stars.
We find that the Oi 6300 Å and the Neii 12.8 µm lines are predominantly produced in the X-ray-driven wind and thus appear blueshifted by a few km/s for some of the systems when observed at non-edge-on inclinations. We note, however, that blueshifts are only produced under certain conditions: X-ray luminosity, spectral shape and inner hole size all affect the location of the emitting region and the physical conditions in the wind. We caution therefore that while a blueshifted line is a tell-tale sign of an outflow, the lack of a blueshift should not be necessarily interpreted as a lack of outflow. Comparison of spectrally resolved observations of multiple emission lines with detailed model sets, like the one presented here, should provide useful diagnostics of the clearing of gaseous discs.
Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS
Journal keyword(s): accretion, accretion discs - protoplanetary discs - circumstellar matter - planetary systems - stars: pre-main-sequence
Simbad objects: 10
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