A search for wide (sub)stellar companions around extrasolar planet host   stars
  We present an overview of our ongoing systematic search for wide (sub)stellar companions around the stars known to host rad-vel planets. By using a relatively large field of view and going very deep, our survey can find all directly detectable stellar and massive brown dwarf companions (m>40 Mjup) within a 1000 AU orbit. 
M. Mugrauer, R. Neuh\"auser, T. Mazeh, M. Fern\'andez and E. Guenther