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In this paper a homomorphic filtering scheme is proposed to improve theestimation of the planet/star radius ratio in astronomical transit signals. Theidea is to reduce the effect of the short-term earth atmosphere variations. Atwo-step method is presented to compute the parameters of the transit curvefrom both the unfiltered and filtered data. A Monte Carlo analysis is performedby using correlated and uncorrelated noise to determine the parameters of theproposed FFT filter. The method is tested with observations of WASP-19b andWASP-17b obtained with the FORS2 instrument at the Very Large Telescope (VLT).The multi parametric fitting and the associated errors are obtained with theJKTEBOP software. The results with the white light of the exo-planet datamentioned above suggest that the homomorphic filtering can lead to substantialrelative reductions in the error bars as high as 45.5% and 76.9%, respectively.The achieved reductions in the averaged error bars per channel were 48.4% withWASP-19b and 63.6% with WASP-17b. Open source MATLAB code to run the methodproposed here can be downloaded from http://www.cmrsp.cl. This code was used toobtain the results presented in this paper.

Estimation of Exoplanetary Planet-to-Star Radius Ratio with Homomorphic Processing