The recent success of Kepler space telescope in detecting several circumbinary
planets combined with many detections of circumprimary planets during the past
decade have firmly indicated that planet formation in and around
binary star systems
is robust and planets of variety of types and sizes can exist in
different orbits in
these complex environments. The orbital diversity of these objects raises many
challenging questions in regard to the formation, possible migration,
and dynamical
evolution of these bodies. For instance, almost all currently known
circumbinary
planets are Jovian type and orbit their host binaries in the inner
edges of their
stability regions. Also, radial velocity searches for circumprimary
planets seem to
indicate that binaries with separations smaller than 20 AU cannot host planets.
On the other hand, models of terrestrial/habitable planet formation in
and around
binaries suggest that Earth-sized planets with substantial amount of water can
exist in such systems implying that habitable planet-hosting binary
star systems
exist and their detection is only a matter of time. I will review the
current state of
research on the observation of planets in binary star system using RV, ETV, and
transit photometry, and discuss the theoretical models of their formation,
dynamical evolution, and their habitability.