Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 416, Issue 2, Pages 1500-1508Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2011.19147.x
Keywords
radiative transfer; methods: numerical; protoplanetary discs; stars: pre-main-sequence
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Funding
- STFC [ST/F003277/1]
- University of Exeter
- Science and Technology Facilities Council [ST/H008535/1, ST/F003277/1] Funding Source: researchfish
- STFC [ST/F003277/1, ST/H008535/1] Funding Source: UKRI
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A new Monte Carlo algorithm for calculating time-dependent radiative transfer under the assumption of local thermodynamic equilibrium is presented. Unlike flux-limited diffusion, the method is polychromatic, includes scattering, and is able to treat the optically-thick and free-streaming regimes simultaneously. The algorithm is tested on a variety of 1D and 2D problems, and good agreement with benchmark solutions is found. The method is used to calculate the time-varying spectral energy distribution from a circumstellar disc illuminated by a protostar whose accretion luminosity is varying. It is shown that the time-lag between the optical variability and the infrared variability results from a combination of the photon traveltime and the thermal response in the disc, and that the lag is an approximately linear function of wavelength.
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