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Notwithstanding the tremendous growth of the exoplanetary field in the lastdecade, limited attention has been paid to the planets around binary stars.Circumbinary planets (CBPs) have been discovered primarily around Main Sequence(MS) stars. No exoplanet has been found orbiting double white dwarf (DWD)binaries yet. We modelled the long-term evolution of CBPs, throughout the lifestages of their hosts, from MS to white dwarf (WD). Our goal is to provide thecommunity with both theoretical constraints on CBPs evolution beyond the MS andthe occurrence rates of planet survival. We further developed the publiclyavailable Triple Evolution Simulation (TRES) code, implementing a variety ofphysical processes affecting substellar bodies. We then used this code tosimulate the evolution, up to one Hubble time, of two synthetic populations ofcircumbinary giant planets. Each population has been generated using differentpriors for the planetary orbital parameters. In our simulated populations weidentified several evolutionary categories, such as survived, merged, anddestabilised systems. Our primary focus is those systems where the planetsurvived the entire system evolution and orbits a DWD binary, which we call"Magrathea" planets. We found that a significant fraction of simulated CBPssurvive and become Magratheas. In the absence of multi-planet migrationmechanisms, this category of planets is characterised by long orbital periods.Magrathea planets are a natural outcome of triple systems evolution, and theycould be relatively common in the Galaxy. They can survive the death of theirbinary hosts if they orbit far enough to avoid engulfment and instabilities.Our results can ultimately be a reference to orient future observations of thisuncharted class of planets and to compare different theoretical models.

Statistics of Magrathea exoplanets beyond the Main Sequence. Simulating the long-term evolution of circumbinary giant planets with TRES