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The GAPS Programme with HARPS-N@TNG II: No giant planets around the metal-poor star HIP 11952

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arxiv 1302.3093 v1 pith:UY7LRMA7 submitted 2013-02-13 astro-ph.EP

S. Desidera , A. Sozzetti , A.S. Bonomo , R. Gratton , E. Poretti , R. Claudi , D.W. Latham , L. Affer
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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. Micela I. Pagano L. Bedin K. Biazzo F. Borsa E. Carolo E. Covino F. Faedi G. Hebrard C. Lovis A. Maggio L. Mancini F. Marzari S. Messina E. Molinari U. Munari F. Pepe N. Santos G. Scandariato E. Shkolnik J. Southworth
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keywords metal-poorstargiantplanetsradialgapsharps-nplanetary
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In the context of the program Global Architecture of Planetary Systems (GAPS), we have performed radial velocity monitoring of the metal-poor star HIP 11952 on 35 nights over about 150 days using the newly installed high resolution spectrograph HARPS-N at the TNG and HARPS at ESO 3.6m telescope. The radial velocities show a scatter of 7 m/s, compatible with the measurement errors for such a moderately warm metal-poor star (Teff = 6040+-120K; [Fe/H] =-1.9+-0.1). We then 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 and 105.2+-14.7 m/s, respectively, which had recently been announced. This result is important considering that HIP 11952 was thought to be the most metal-poor star hosting a planetary system with giant planets, thus challenging some models of planet formation.

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  1. The GAPS Programme with HARPS-N at TNG LXXVII. Occurrence rates of small close-in planets in the presence of cold Jupiters

    astro-ph.EP 2026-07 accept novelty 6.0 of 10

    Occurrence rates of hot/warm/cool Neptunes and Super-Earths around cold-Jupiter hosts are ~5–16%, higher when the outer giant leaves a stable inner zone, with no strong ISP–CJ correlation at average metallicity.

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