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This discovery is based on 373 high-quality radial velocity measurements taken by HARPS over 13 yr. Given the low masses of the planets, the signal-to-noise ratio is not sufficient to constrain the planet eccentricities. However, a preliminary dynamical analysis suggests that eccentricities should be typically lower than about 0.03 for the system to remain stable. With two pairs of planets with a period ratio lower than 1.5, with short orbital periods, low masses, and low eccentricities, HD 215152 is similar to the very compact multi-planet systems found by <jats:italic>Kepler<\/jats:italic>, which is very rare in radial-velocity surveys. This discovery proves that these systems can be reached with the radial-velocity technique, but characterizing them requires a huge amount of observations.<\/jats:p>","DOI":"10.1051\/0004-6361\/201732529","type":"journal-article","created":{"date-parts":[[2018,2,13]],"date-time":"2018-02-13T19:43:52Z","timestamp":1518551032000},"page":"A133","source":"Crossref","is-referenced-by-count":55,"title":["The HARPS search for southern extra-solar planets"],"prefix":"10.1051","volume":"614","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5844-9888","authenticated-orcid":false,"given":"J.-B.","family":"Delisle","sequence":"first","affiliation":[]},{"given":"D.","family":"S\u00e9gransan","sequence":"additional","affiliation":[]},{"given":"X.","family":"Dumusque","sequence":"additional","affiliation":[]},{"given":"R. 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