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We report the detection of a planetary system around BD-08:2823, thatincludes at least one Uranus-mass planet and one Saturn-mass planet. Thisdiscovery serendipitously originates from a search for planetary transits inthe Hipparcos photometry database. This program preferentially selected activestars and did not allow the detection of new transiting planets. It allowedhowever the identification of the K3V star BD-08:2823 as a target harboring amultiplanet system, that we secured and characterized thanks to an intensivemonitoring with the HARPS spectrograph at the 3.6-m ESO telescope in La Silla.The stellar activity level of BD-08:2823 complicates the analysis but does notprohibit the detection of two planets around this star. BD-08:2823b has aminimum mass of 14.4+/-2.1 M_Earth and an orbital period of 5.60 days, whereasBD-08:2823c has a minimum mass of 0.33+/-0.03 M_Jup and an orbital period of237.6 days. This new system strengthens the fact that low-mass planets arepreferentially found in multiplanetary systems, but not around high-metallicitystars as this is the case for massive planets. It also supports the belief thatactive stars should not be neglected in exoplanet searches, even when searchingfor low-mass planets.

The HARPS search for southern extra-solar planets. XX. Planets around the active star BD-08:2823