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Carbon monoxide (CO) has been detected in all Giant Planets and its origin is both internal and external in Jupiter and Neptune. Despite its first detection in Uranus a decade ago, the magnitude of its internal and external sources remains unconstrained.\n  Aims. We targeted CO lines in Uranus in the submillimeter range to constrain its origin.\n  Methods. We recorded disk-averaged spectra of Uranus with a very high spectral resolution at the frequencies of CO rotational lines in the submillimeter range in 2011-2012. We used empirical and diffusion models of the atmosphere of Uranus to ","authors_text":"C. Jarchow, E. Lellouch, F. Hersant, F. Selsis, G. S. Orton, L. N. Fletcher, O. Venot, P. Hartogh, R. Moreno, T. Cavali\\'e, T. 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