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