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The wealth of recent data from imaging air Cherenkov telescopes (IACTs),ultra-high energy cosmic-ray experiments and neutrino telescopes have fuelled arenewed interest in hadronic emission models for gamma-loud blazars. We explorephysically plausible solutions for a lepto-hadronic interpretation of thestationary emission from high-frequency peaked BL Lac objects (HBLs). Themodelled spectral energy distributions are then searched for specificsignatures at very high energies that could help to distinguish the hadronicorigin of the emission from a standard leptonic scenario. By introducing a fewbasic constraints on parameters of the model, such as assuming theco-acceleration of electrons and protons, we significantly reduced the numberof free parameters. We then systematically explored the parameter space of thesize of the emission region and its magnetic field for two bright gamma-loudHBLs, PKS 2155-304 and Mrk 421. For all solutions close to equipartitionbetween the energy densities of protons and of the magnetic field, and withacceptable jet power and light-crossing timescales, we inspected the spectralhardening in the multi-TeV domain from proton-photon induced cascades andmuon-synchrotron emission inside the source. Very-high-energy spectra simulatedwith the available instrument functions from the future Cherenkov TelescopeArray (CTA) were evaluated for detectable features as a function of exposuretime, source redshift, and flux level. Over a large range of model parameters,the spectral hardening due to internal synchrotron-pair cascades, the "cascadebump", should be detectable for acceptable exposure times with the future CTAfor a few nearby and bright HBLs.

Expected signatures from hadronic emission processes in the TeV spectra of BL Lac objects