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Context: Planets are formed amidst young circumstellar disks of gas and dust.The latter is traced by thermal radiation, where strong asymmetric clumps wereobserved in a handful of cases. These dust traps could be key to understand theearly stages of planet formation, when solids grow from micron-size toplanetesimals. Aims: Vortices are among the few known asymmetric dust trappingscenarios. The present work aims at predicting their characteristics in acomplementary observable. Namely, line-of-sight velocities are well suited totrace the presence of a vortex. Moreover, the dynamics of disks is subject torecent developments. Methods: 2D hydro-simulations were performed where avortex forms at the edge of a gas depleted region. We derived idealizedline-of-sight velocity maps, varying disk temperature and orientation relativeto the observer. The signal of interest, as a small perturbation to thedominant axisymetric component in velocity, may be isolated in observationaldata using a proxy for the dominant quasi-Keplerian velocity. We propose thatthe velocity curve on the observational major axis be such a proxy. Results:Applying our method to the disk around HD 142527 as a study case, we predictline-of-sight velocities scarcely detectable by currently available facilities,depending on disk temperature. We show that corresponding spirals patterns canalso be detected with similar spectral resolutions, which will helpdiscriminating against alternative explanations.

Dynamical signatures of Rossby vortices in cavity-hosting disks