The RADTRANS Radiative Transfer Model

Radtrans is a general purpose planetary radiative transfer model for computing the transmission of atmospheric paths and/or the radiances emitted by planetary atmospheres. The code is general purpose and not hard-wired to any specific planet. Radtrans evolved from Genlbl, which was a general purpose planetary line-by-line model, developed by Dr Simon Calcutt. Radtrans extended the functionality of this program to also allow the computation of planetary spectra using both band model approximations and also the correlated-k approximation. The code has also been extended to incorporate both multiple scattering and single scattering calculations.

The NEMESIS Correlated-k Retrieval Model

NEMESIS (Non-linear optimal Estimator for MultivariatE spectral analySIS) is general purpose correlated-k retrieval code developed from the Radtrans project. Nemesis was originally developed for Cassini/CIRS retrievals, but was designed from the start to be applicable to any planetary atmosphere. It has since been applied to analyse the spectra of every planet in our solar system that has an atmosphere and has also been extended to analyse the spectra of exoplanets. The Radtrans/Nemesis project is continually being developed and extended and is managed with the 'subversion' program. Follow these links to view the current manuals for the 2.1 release of Radtrans and Nemesis .

Scientists interested in running either Nemesis or Radtrans to analyse their data are very welcome to contact me.


Irwin, P.G.J., N.A. Teanby, R. de Kok, L.N. Fletcher, C.J.A. Howett, C.C.C. Tsang, C.F. Wilson, S.B. Calcutt, C.A. Nixon, P.D. Parrish, The NEMESIS planetary atmosphere radiative transfer and retrieval tool, J. Quant. Spectrosc. and Rad. Trans., 109, 1136-1150, 2008.

Irwin, P. G. J., S. B. Calcutt and F. W. Taylor, Radiative transfer models for Galileo NIMS studies of the atmosphere of Jupiter. Adv. Space. Res. 19, No. 8, pp 1149-1158, 1997.

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