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2012MNRAS.422.1880O - Mon. Not. R. Astron. Soc., 422, 1880-1901 (2012/May-3)
On the theory of disc photoevaporation.
OWEN J.E., CLARKE C.J. and ERCOLANO B.
Abstract (from CDS):
The model suggests that the X-ray component dominates the photoevaporative mass-loss rates from the inner disc. The mass-loss rates have values in the range from 10–11 to 10–7 M☉/yr and scale linearly with X-ray luminosity, with only a weak dependence on the other parameters explored. However, in the case of high FUV-to-X-ray luminosity ratios (LFUV/LX> 100), the FUV constricts the X-ray flow and may dominate the mass loss.
Simulations of low-mass discs with inner holes demonstrate a further stage of disc clearing, which we call `thermal sweeping'. This process occurs when the mid-plane pressure drops to sufficiently low values. At this stage, a bound, warm, X-ray heated region becomes sufficiently large and unstable, such that the remaining disc material is cleared on approximately dynamical time-scales. This process significantly reduces the time taken to clear the outer regions of the disc, resulting in an expected transition disc population that will be dominated by accreting objects, as indicated by recent observations.
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS
Journal keyword(s): accretion, accretion discs - circumstellar matter - protoplanetary discs - planetary systems - stars: pre-main-sequence - X-rays: stars
Simbad objects: 1
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