The GAPS programme with HARPS-N at TNG II. No giant planets around the metal-poor star HIP 11952

In the context of the programme Global Architecture of Planetary Systems (GAPS), we have performed radial velocity monitoring of the metal-poor star HIP 11952 on 35 nights during about 150 days using the newly installed high-resolution spectrograph HARPS-N at the TNG and HARPS at the ESO 3.6 m telescope. The radial velocities show a scatter of 7 m s(-1), compatible with the measurement errors for such a moderately warm metal-poor star (T-eff = 6040 +/- 120 K; [Fe/H] = -1.9 +/- 0.1). We exclude the presence of the two giant planets with periods of 6.95 +/- 0.01 d and 290.0 +/- 16.2 d and radial velocity semi-amplitudes of 100.3 +/- 19.4 m s(-1) and 105.2 +/- 14.7 m s(-1), respectively, which have recently been announced. This result is important because HIP 11952 was thought to be the most metal-poor star hosting a planetary system with giant planets, which challenged some models of planet formation.