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We acquired high resolution IR spectra of CI Tau, the host star of one of thefew young planet candidates amenable to direct spectroscopic detection. Weconfirm the planet's existence with a direct detection of CO in the planet'satmosphere. We also calculate a mass of 11.6 M$_J$ based on the amplitude ofits radial velocity variations. We estimate its flux contrast with its hoststar to get an absolute magnitude estimate for the planet of 8.17 in the Kband. This magnitude implies the planet formed via a "hot start" formationmechanism. This makes CI Tau b the youngest confirmed exoplanet as well as thefirst exoplanet around a T Tauri star with a directly determined,model-independent, dynamical mass.

CO Detected in CI Tau b: Hot Start Implied by Planet Mass and M$_K$