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We present a study of the Ca II K and IR-triplet lines in a sample ofClassical T Tauri stars in the Chamaeleon I star-forming region. We studyX-shooter spectra of the stars in the sample and find that in some of thesestars the Ca II lines are much weaker than expected from their H line fluxesand mass accretion rate. Since the Ca II K lines have characteristicmagnetospheric accretion line profiles and the magnetospheric flows feeddirectly from the inner disk, we interpret the Ca deficit in terms of depletiondue to processes happening in the disk. To test this hypothesis, we define acoarse depletion indicator using the flux of the Ca II K line and show that itcorrelates with disk properties. In particular, using indicators extracted fromSpitzer/IRS spectra, we obtain that all the transitional and pre-transitionaldisks of the sample show depletion, consistent with trapping of refractories inpressure bumps created by planets and/or in the planets themselves. We findfull disks with Ca depletion in the sample that also show indications ofadvanced dust evolution. We apply magnetospheric accretion models to fit theBalmer and Ca II line fluxes of a star showing clear Ca depletion and derive aCa abundance in its inner disk of about 17% solar.

The Ca II lines as tracers of disk structure in T Tauri Stars: The Chamaeleon I region