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Current observational data of exoplanets are providing increasing detail oftheir 3D atmospheric structures. As characterisation efforts expand in scope,the need to develop consistent 3D radiative-transfer methods becomes morepertinent as the complex atmospheric properties of exoplanets are required tobe modelled together consistently. We aim to compare the transmission andemission spectra results of a 3D Monte Carlo Radiative Transfer (MCRT) model tocontemporary radiative-transfer suites. We perform several benchmarking testsof a MCRT code, Cloudy Monte Carlo Radiative Transfer (CMCRT), to transmissionand emission spectra model output. We add flexibility to the model through theuse of k-distribution tables as input opacities. We present a hybrid MCRT andray tracing methodology for the calculation of transmission spectra with amultiple scattering component. CMCRT compares well to the transmission spectrabenchmarks at the 10s of ppm level. Emission spectra benchmarks are consistentto within 10% of the 1D models. We suggest that differences in the benchmarkresults are likely caused by geometric effects between plane-parallel andspherical models. In a practical application, we post-process a cloudy 3DHD189733b GCM model and compare to available observational data. Our resultssuggest the core methodology and algorithms of CMCRT produce consistent resultsto contemporary radiative transfer suites. 3D MCRT methods are highly suitablefor detailed post-processing of cloudy and non-cloudy 1D and 3D exoplanetatmosphere simulations in instances where atmospheric inhomogeneities,significant limb effects/geometry or multiple scattering components areimportant considerations.

Exoplanetary Monte Carlo Radiative Transfer with Correlated-k I. Benchmarking Transit and Emission Observables