A BCool survey of the magnetic fields of planet-hosting solar-type stars
  We present a spectropolarimetric snapshot survey of solar-type planet hosting
stars. In addition to 14 planet-hosting stars observed as part of the BCool
magnetic snapshot survey, we obtained magnetic observations of a further 19
planet-hosting solar-type stars in order to see if the presence of close-in
planets had an effect on the measured surface magnetic field (|B$_{\ell}$|).
Our results indicate that the magnetic activity of this sample is congruent
with that of the overall BCool sample. The effects of the planetary systems on
the magnetic activity of the parent star, if any, are too subtle to detect
compared to the intrinsic dispersion and correlations with rotation, age and
stellar activity proxies in our sample. Four of the 19 newly observed stars,
two of which are subgiants, have unambiguously detected magnetic fields and are
future targets for Zeeman Doppler Mapping.
