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Protoplanets can produce structures in protoplanetary disks via gravitationaldisk-planet interactions. Once detected, such structures serve as signposts ofplanet formation. Here we investigate the kinematic signatures in disksproduced by multi-Jupiter mass ($M_{\rm J}$) planets using 3D hydrodynamics andradiative transfer simulations. Such a planet opens a deep gap, and drivestransonic vertical motions inside. Such motions include both a bulk motion ofthe entire half-disk column, and turbulence on scales comparable to and smallerthan the scale height. They significantly broaden molecular lines from the gap,producing double-peaked line profiles at certain locations, and a kinematicvelocity dispersion comparable to thermal after azimuthal averaging. The sameplanet does not drive fast vertical motions outside the gap, except at theinner spiral arms and the disk surface. Searching for line broadening inducedby multi-$M_{\rm J}$ planets inside gaps requires an angular resolutioncomparable to the gap width, an assessment of the gap gas temperature to withina factor of 2, and a high sensitivity needed to detect line emission from thegap.

Observational Signatures of Planets in Protoplanetary Disks: Planet-Induced Line Broadening in Gaps