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

astronomy and astrophysics

The HARPS search for southern extra-solar planets. XLVI: 12 super-Earths  around the solar type stars HD39194, HD93385, HD96700, HD154088, and HD189567