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CoRoT-20 c has a minimum mass of 17 \u00b1 1 <jats:italic>M<\/jats:italic><jats:sub><jats:italic>Jup<\/jats:italic><\/jats:sub> and orbits the host star in 4.59 \u00b1 0.05 yr, with an orbital eccentricity of 0.60 \u00b1 0.03. This is the first identified system with an eccentric hot Jupiter and an eccentric massive companion. The discovery of the latter might be an indication of the migration mechanism of the hot Jupiter, via the Lidov\u2013Kozai effect. 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