  Earth mass exoplanets are difficult to detect. The Dispersed Matter Planet
Project (DMPP) identifies stars which are likely to host the most detectable
low mass exoplanets. The star DMPP-3 (HD 42936) shows signs of circumstellar
absorption, indicative of mass loss from ablating planets. Here we report the
radial velocity (RV) discovery of a highly eccentric 507 d binary companion and
a hot super-Earth planet in a 6.67 d orbit around the primary star. DMPP-3A is
a solar type star while DMPP-3B is just massive enough to fuse hydrogen. The
binary, with semi-major axis 1.22 $\pm$ 0.02 AU, is considerably tighter than
others known to host planets orbiting only one of the component stars. The
configuration of the DMPP-3 planetary system is rare and indicates dynamical
interactions, though the evolutionary history is not entirely clear. DMPP-3Ab
is possibly the residual core of a giant planet precursor, consistent with the
inferred circumstellar gas shroud.
