{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,27]],"date-time":"2026-02-27T00:34:16Z","timestamp":1772152456462,"version":"3.50.1"},"reference-count":100,"publisher":"EDP Sciences","license":[{"start":{"date-parts":[[2019,1,15]],"date-time":"2019-01-15T00:00:00Z","timestamp":1547510400000},"content-version":"vor","delay-in-days":14,"URL":"https:\/\/www.edpsciences.org\/en\/authors\/copyright-and-licensing"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["A&amp;A"],"accepted":{"date-parts":[[2018,11,17]]},"published-print":{"date-parts":[[2019,1]]},"abstract":"<jats:p><jats:italic>Context.<\/jats:italic> Statistical studies of exoplanets have shown that giant planets are more commonly hosted by metal-rich dwarf stars than low-metallicity stars, while no such correlation is evident for lower mass planets. The search for giant planets around metal-poor stars and the estimate of their occurrence <jats:italic>f<\/jats:italic><jats:sub><jats:italic>p<\/jats:italic><\/jats:sub> is an important element in providing support to models of planet formation.<\/jats:p>\n<jats:p><jats:italic>Aims.<\/jats:italic> We present results from the HARPS-N search for giant planets orbiting metal-poor (\u2212 1.0 \u2264[Fe\/H] \u2264\u22120.5 dex) stars in the northern hemisphere, complementing a previous HARPS survey on southern stars in order to update the estimate of <jats:italic>f<\/jats:italic><jats:sub><jats:italic>p<\/jats:italic><\/jats:sub>.<\/jats:p>\n<jats:p><jats:italic>Methods.<\/jats:italic> High-precision HARPS-N observations of 42 metal-poor stars were used to search for planetary signals to be fitted using differential evolution Markov chain Monte Carlo single-Keplerian models. We then joined our detections to the results of the previous HARPS survey on 88 metal-poor stars to provide a preliminary estimate of the two-hemisphere <jats:italic>f<\/jats:italic><jats:sub><jats:italic>p<\/jats:italic><\/jats:sub>.<\/jats:p>\n\n<jats:p><jats:italic>Results.<\/jats:italic> We report the detection of two new giant planets around HD 220197 and HD 233832. The first companion has Msin <jats:italic>i<\/jats:italic> = 0.20<jats:sub>\u22120.04<\/jats:sub><jats:sup>+0.07<\/jats:sup> <jats:italic>M<\/jats:italic><jats:sub>Jup<\/jats:sub> and an orbital period of 1728<jats:sub>\u221280<\/jats:sub><jats:sup>+162<\/jats:sup> days, and for the second companion, we find two solutions of equal statistical weight with periods of 2058<jats:sub>\u221240<\/jats:sub><jats:sup>+47<\/jats:sup> and 4047<jats:sub>\u2212117<\/jats:sub><jats:sup>+91<\/jats:sup> days and minimum masses of 1.78<jats:sub>\u22120.06<\/jats:sub><jats:sup>+0.08<\/jats:sup> and 2.72<jats:sub>\u22120.23<\/jats:sub><jats:sup>+0.23<\/jats:sup> <jats:italic>M<\/jats:italic><jats:sub>Jup<\/jats:sub>, respectively. Joining our two detections with the three from the southern survey, we obtain a preliminary and conservative estimate of the global frequency of <jats:italic>f<\/jats:italic><jats:sub><jats:italic>p<\/jats:italic><\/jats:sub> = 3.84 <jats:sub>\u22121.06<\/jats:sub><jats:sup>+2.45<\/jats:sup>% for giant planets around metal-poor stars.<\/jats:p><jats:p><jats:italic>Conclusions.<\/jats:italic> The two new giant planets orbit dwarf stars at the metal-rich end of the HARPS-N metal-poor sample. This corroborates previous results that suggested that giant planet frequency is still a rising function of the host star [Fe\/H]. We also note that all detections in the overall sample are giant long-period planets.<\/jats:p>","DOI":"10.1051\/0004-6361\/201834305","type":"journal-article","created":{"date-parts":[[2018,11,22]],"date-time":"2018-11-22T19:47:06Z","timestamp":1542916026000},"page":"A110","source":"Crossref","is-referenced-by-count":12,"title":["The GAPS Programme with HARPS-N at TNG"],"prefix":"10.1051","volume":"621","author":[{"given":"D.","family":"Barbato","sequence":"first","affiliation":[]},{"given":"A.","family":"Sozzetti","sequence":"additional","affiliation":[]},{"given":"K.","family":"Biazzo","sequence":"additional","affiliation":[]},{"given":"L.","family":"Malavolta","sequence":"additional","affiliation":[]},{"given":"N. C.","family":"Santos","sequence":"additional","affiliation":[]},{"given":"M.","family":"Damasso","sequence":"additional","affiliation":[]},{"given":"A. 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