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We present a detailed dynamical analysis of the orbital stability of the twocircumbinary planets recently proposed to orbit the evolved eclipsing binarystar system NSVS 14256825. As is the case for other recently proposedcircumbinary planetary systems detected through the timing of mutual eclipsesbetween the central binary stars, the proposed planets do not stand up todynamical scrutiny. The proposed orbits for the two planets are extremelyunstable on timescales of less than a thousand years, regardless of the mutualinclination between the planetary orbits.  For the scenario where the planetary orbits are coplanar, a small region ofmoderate stability was observed, featuring orbits that were somewhat protectedfrom destabilisation by the influence of mutual 2:1 mean-motion resonancebetween the orbits of the planets. Even in this stable region, however, thesystems tested typically only survived on timescales of order 1 million years,far shorter than the age of the system.  Our results suggest that, if there are planets in the NSVS 14256825 system,they must move on orbits dramatically different to those proposed in thediscovery work. More observations are clearly critically required in order toconstrain the nature of the suggested orbital bodies.

On the dynamical stability of the proposed planetary system orbiting NSVS 14256825