  Context. We present precise radial-velocity measurements of five solar-type
stars observed with the HARPS Echelle spectrograph mounted on the 3.6-m
telescope in La Silla (ESO, Chile). With a time span of more than 10 years and
a fairly dense sampling, the survey is sensitive to low mass planets down to
super-Earths on orbital periods up to 100 days. Aims. Our goal was to search
for planetary companions around the stars HD39194, HD93385, HD96700, HD154088,
and HD189567 and use Bayesian model comparison to make an informed choice on
the number of planets present in the systems based on the radial velocity
observations. These findings will contribute to the pool of known exoplanets
and better constrain their orbital parameters. Methods. A first analysis was
performed using the DACE (Data & Analysis Center for Exoplanets) online tools
to assess the activity level of the star and the potential planetary content of
each system. We then used Bayesian model comparison on all targets to get a
robust estimate of the number of planets per star. We did this using the nested
sampling algorithm PolyChord. For some targets, we also compared different
noise models to disentangle planetary signatures from stellar activity. Lastly,
we ran an efficient MCMC (Markov chain Monte Carlo) algorithm for each target
to get reliable estimates for the planets' orbital parameters. Results. We
identify 12 planets within several multiplanet systems. These planets are all
in the super-Earth and sub-Neptune mass regime with minimum masses ranging
between 4 and 13 M$_\oplus$ and orbital periods between 5 and 103 days. Three
of these planets are new, namely HD 93385 b, HD 96700 c, and HD 189567 c.
