  A planet hardly ever survives the supernova of the host star in a bound
orbit, because mass loss in the supernova and the natal kick imparted to the
newly formed compact object cause the planet to be ejected. A planet in orbit
around a binary has a considerably higher probability to survive the supernova
explosion of one of the inner binary stars. In those cases, the planet most
likely remains bound to the companion of the exploding star, whereas the
compact object is ejected. We estimate this to happen to $\sim 1/33$ the
circum-binary planetary systems. These planetary orbits tend to be highly
eccentric ($e \apgt 0.9$), and $\sim 20$\,\% of these planets have retrograde
orbits compared to their former binary. The probability that the planet as well
as the binary (now with a compact object) remains bound is about ten times
smaller ($\sim 3\cdot 10^{-3}$). We then expect the Milky way Galaxy to host
$\aplt 10$ x-ray binaries that are still orbited by a planet, and $\aplt 150$
planets that survived in orbit around the compact object's companion. These
numbers should be convolved with the fraction of massive binaries that is
orbited by a planet.
