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We investigate the formation of double-peaked asymmetric line profiles of COin the fundamental band spectra emitted by young (1-5Myr) protoplanetary diskshosted by a 0.5-2 Solar mass star. Distortions of the line profiles can becaused by the gravitational perturbation of an embedded giant planet with q=4.710^-3 stellar-to-planet mass ratio. Locally isothermal, 2D hydrodynamicsimulations show that the disk becomes globally eccentric inside the planetaryorbit with stationary ~0.2-0.25 average eccentricity after ~2000 orbitalperiods. For orbital distances 1-10 AU, the disk eccentricity is peaked insidethe region where the fundamental band of CO is thermal excitated. Hence, theselines become a sensitive indicators of the embedded planet via theirasymmetries (both in flux and wavelength). We find that the line shapedistortions (e.g. distance, central dip, asymmetry and positions of peaks) of agiven transition depend on the excitation energy (i.e. on the rotationalquantum number J). The magnitude of line asymmetry is increasing/decreasingwith J if the planet orbits inside/outside the CO excitation zone (R_CO<=3, 5and 7 AU for a 0.5,1 and 2 Solar mass star, respectively), thus one canconstrain the orbital distance of a giant planet by determining the slope ofpeak asymmetry-J profile. We conclude that the presented spectroscopicphenomenon can be used to test the predictions of planet formation theories bypushing the age limits for detecting the youngest planetary systems.

Asymmetric fundamental band CO lines as a sign of an embedded giant planet