Mon. Not. R. Astron. Soc., 481, 452-466 (2018/November-3)
The FRIED grid of mass-loss rates for externally irradiated protoplanetary discs.
HAWORTH T.J., CLARKE C.J., RAHMAN W., WINTER A.J. and FACCHINI S.
Abstract (from CDS):
We present an open access grid of 3930 calculations of externally evaporating protoplanetary discs. This spans a range of disc sizes (1-400 au), disc masses, UV field strengths (10-104 G0), and stellar masses (0.05-1.9 M☉). The grid is publicly available for download, and offers a means of cheaply including external photoevaporation in disc evolutionary calculations. It can also be queried using an online tool for quick estimates of instantaneous mass-loss rates (e.g for convenient evaluation of real observed systems). The ``FRIED'' grid itself illustrates that for discs around stars <=0.3 M☉, external photoevaporation is effective down to small radii (<50 au) down to UV fields at least as weak as 10 G0. At the other end of the scale, in a 104 G0 environment photoevaporation is effective down to 1 au even for stellar masses at least as high as 1.9 M☉. We also illustrate in which regimes CO survives in the photoevaporative outflow for significant mass-loss rates; marking a system a good candidate to detect external photoevaporation in weak-intermediate UV environments through sub-Keplerian rotation. Finally, we make illustrative mass-loss rate estimates for discs in Taurus based on the Guilloteau et al. (2011) star-disc parameters, finding that around half are expected to have both significant mass-loss and retain CO in the photoevaporative outflow.
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
accretion, accretion discs - hydrodynamics - protoplanetary discs - circumstellar matter - photodissociation region (PDR) - planetary systems: formation
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