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Spectroscopy is an important tool for providing insights into the structureof core-collapse supernova explosions. We use the Monte Carlo radiativetransfer code ARTIS to compute synthetic spectra and light curves based on atwo-dimensional explosion model of an ultra-stripped supernova. Thesecalculations are designed both to identify observable fingerprints ofultra-stripped supernovae and as a proof-of-principle for using syntheticspectroscopy to constrain the nature of stripped-envelope supernovae morebroadly. We predict very characteristic spectral and photometric features forour ultra-stripped explosion model, but find that these do not match observedultra-stripped supernova candidates like SN 2005ek. With a peak bolometricluminosity of $6.8\times10^{41}\,\mathrm{erg}\,\mathrm{s}^{-1}$, a peakmagnitude of $-15.9\,\mathrm{mag}$ in R-band, and $\Deltam_{15,\mathrm{R}}=3.50$, the model is even fainter and evolves even faster thanSN 2005ek as the closest possible analogue in photometric properties. Thepredicted spectra are extremely unusual. The most prominent features are Mg IIlines at 2,800 Angstrom and 4,500 Angstrom and the infrared Ca triplet at latetimes. The Mg lines are sensitive to the multi-dimensional structure of themodel and are viewing-angle dependent. They disappear due to line blanketing byFe group elements in a spherically averaged model with additional microscopicmixing. In future studies, multi-D radiative transfer calculations need to beapplied to a broader range of models to elucidate the nature of observed TypeIb/c supernovae.

Synthetic Light Curves and Spectra from a Self-Consistent 2D Simulation of an Ultra-strippped Supernova