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More than 450 extrasolar planets are known to date. To detect theseintriguing objects, many photometric and radial velocity (RV) surveys are inprogress. We developed the Keplerian FITting (KFIT) code, to model publishedand available RV data. KFIT is based on a hybrid, quasi-global optimizationtechnique relying on the Genetic Algorithms and simplex algorithm. Here, were-analyse the RV data of evolved K3III star HD 240210. We confirm threeequally good solutions which might be interpreted as signals of 2-planetsystems. Remarkably, one of these best-fits describes the long-term stabletwo-planet system, involved in the 2:1~mean motion resonance (MMR). It may bethe first instance of this strong MMR in a multi-planet system hosted byevolved star, as the 2:1 MMR configurations are already found around a fewsolar dwarfs.

Modeling the Radial Velocities of HD 240210 with the Genetic Algorithms