Most of the ~250 extra solar planets presently known are hosted by
main sequence stars similar to our Sun. When their core hydrogen runs
out, main sequence stars undergo a red giant expansion that modifies
the planetary orbits and can easily reach and engulf the inner
planets.
The fate of the inner planets during and after the red giant phase is
largely unkown. In this talk we describe the detection of the first
planetary-mass companion to a post-red giant star, orbiting the
extreme horizontal branch pulsating star V 391 Pegasi at a distance of
about 1.7 AU, with a period of 3.2 yr.