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The aim of the project is to improve our knowledge on the multiplicity ofplanet-host stars at wide physical separations.  We cross-matched approximately 6200 square degree area of the Southern skyimaged by the Visible Infrared Survey Telescope for Astronomy (VISTA)Hemisphere Survey (VHS) with the Two Micron All Sky Survey (2MASS) to look forwide common proper motion companions to known planet-host stars. Wecomplemented our astrometric search with photometric criteria.  We confirmed spectroscopically the co-moving nature of seven sources out of16 companion candidates and discarded eight, while the remaining one stays as acandidate. Among these new wide companions to planet-host stars, we discovereda T4.5 dwarf companion at 6.3 arcmin (~9000 au) from HIP70849, a K7V star whichhosts a 9 Jupiter mass planet with an eccentric orbit. We also report two newstellar M dwarf companions to one G and one metal-rich K star. We infer stellarand substellar binary frequencies for our complete sample of 37 targets of5.4+/-3.8% and 2.7+/-2.7% (1 sigma confidence level), respectively, forprojected physical separations larger than ~60-160 au assuming the range ofdistances of planet-host stars (24-75 pc). These values are comparable to thefrequencies of non planet-host stars. We find that the period-eccentricitytrend holds with a lack of multiple systems with planets at largeeccentricities (e > 0.2) for periods less than 40 days. However, the lack ofplanets more massive than 2.5 Jupiter masses and short periods (<40 days)orbiting single stars is not so obvious due to recent discoveries byground-based transit surveys and space missions.

Binary frequency of planet-host stars at wide separations: A new brown dwarf companion to a planet-host star