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

S. Desidera, A. Sozzetti, A. S. Bonomo, R. Gratton, E. Poretti, R. Claudi, D. W. Latham, L. Affer, R. Cosentino, M. Damasso, M. Esposito, P. Giacobbe, L. Malavolta, V. Nascimbeni, G. Piotto, M. Rainer, M. Scardia, V. S. Schmid, A. F. Lanza, G. MicelaI. Pagano, L. R. Bedin, K. Biazzo, F. Borsa, E. Carolo, E. Covino, F. Faedi, G. Hébrard, C. Lovis, A. Maggio, L. Mancini, F. Marzari, S. Messina, E. Molinari, U. Munari, F. Pepe, N. Santos, G. Scandariato, E. Shkolnik, J. Southworth

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

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 (Teff = 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 systemwith giant planets, which challenged some models of planet formation.

Original languageEnglish (US)
Article numberA29
JournalAstronomy and Astrophysics
Volume554
DOIs
StatePublished - 2013
Externally publishedYes

Keywords

  • Planetary systems
  • Stars: individual: HIP 11952
  • Techniques: radial velocities

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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