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We propose that the two newly detected Earth-size planets around the hot Bsubdwarf star KIC 05807616 are remnant of the tidally destructed metallic coreof a massive planet. A single massive gas-giant planet was spiralling-in insidethe envelope of the red giant branch star progenitor of the extreme horizontalbranch (EHB) star KIC 05807616. The released gravitational energy unbound mostof the stellar envelope, turning it into an EHB star. The massive planetreached the tidal destruction radius of ~Ro from the core, where the planet'sgaseous envelope was tidally removed. In our scenario the metallic core of themassive planet was tidally destructed into several Earth-like bodiesimmediately after the gaseous envelope of the planet was removed. Two, andpossibly more, Earth-size fragments survived at orbital separations of >Rowithin the gaseous disk. The bodies interact with the disk and among themselvesand migrated to reach orbits close to a 3:2 resonance. These observed planetscan have a planetary magnetic field about ten times as strong as that of Earth.This strong magnetic field can substantially reduce the evaporation rate fromthe planets and explain their survivability against the strong UV radiation ofthe EHB star.

A tidally destructed massive planet as the progenitor of the two light planets around the sdB star KIC 05807616