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The HARPS search for southern extra-solar planets. XX. Planets around the active star BD -08°2823
We report the detection of a planetary system around BD -08°2823that includes at least one Uranus-mass planet and one Saturn-massplanet. This discovery serendipitously originates from a search forplanetary transits in the Hipparcos photometry database. This programpreferentially selected active stars and did not allow the detection ofnew transiting planets. It allowed however the identification of the K3Vstar BD -08°2823 as a target harboring a multiplanet system, whichwe secured and characterized thanks to an intensive monitoring with theHARPS spectrograph at the 3.6-m ESO telescope in La Silla. The stellaractivity level of BD -08°2823 complicates the analysis but does notprohibit the detection of two planets around this star. BD -08°2823bhas a minimum mass of 14.4±2.1 M? and an orbitalperiod of 5.60 days, whereas BD -08°2823c has a minimum mass of0.33±0.03 MJup and an orbital period of 237.6 days.This new system strengthens the observation that low-mass planets arepreferentially found in multiplanetary systems, but not aroundhigh-metallicity stars as is the case for massive planets. It alsosupports the belief that active stars should not be neglected inexoplanet searches even when searching for low-mass planets.Based on observations made with HARPS spectrograph on the 3.6-m ESOtelescope at La Silla Observatory, Chile, under the programs ID072.C-0488, 074.C-0364 and 078.C-0044. The full version of Table 1(HARPS measurements of BD -08°2823) is only available in electronicform at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5)or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/512/A46
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