Many intermediate- and high-mass stars are in binary or multiple systems,
but the binary formation mechanisms are still uncertain. We have performed
a search for FGK spectral type companions to A and B stars, which may
have formed through instabilities in the protostellar disk in a scaled-up
version of massive planet formation theories. We do so by searching
directly for the spectral lines of the low-mass star using high signal-to-noise
ratio and high resolution spectroscopy. I will describe a search through the
VLT/CRIRES archive for such companions. I will also briefly describe
how a similar technique using the near-infrared spectrograph IGRINS
should be able to detect the thermal emission from a massive planet
orbiting a sun-like star.