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Comparison of theoretical line profiles to observations provides importanttests for supernova explosion models. We study the shapes of radioactive decaylines predicted by current 3D core-collapse explosion simulations, and comparethese to observations of SN 1987A and Cas A. Both the widths and shifts ofdecay lines vary by several thousand kilometers per second depending on viewingangle. The line profiles can be complex with multiple peaks. By combiningobservational constraints from 56Co decay lines, 44Ti decay lines, and Fe IRlines, we delineate a picture of the morphology of the explosive burning ashesin SN 1987A. For M_ZAMS=15-20 Msun progenitors exploding with ~1.5 *10^51 erg,ejecta structures suitable to reproduce the observations involve a bulkasymmetry of the 56Ni of at least ~400 km/s and a bulk velocity of at least~1500 km/s. By adding constraints to reproduce the UVOIR bolometric light curveof SN 1987A up to 600d, an ejecta mass around 14 Msun is favoured. We alsoinvestigate whether observed decay lines can constrain the neutron star (NS)kick velocity. The model grid provides a constraint V_NS > V_redshift, andapplying this to SN 1987A gives a NS kick of at least 500 km/s. For Cas A, oursingle model provides a satisfactory fit to the NuSTAR observations andreinforces the result that current neutrino-driven core-collapse SN models canachieve enough bulk asymmetry in the explosive burning material. Finally, weinvestigate the internal gamma-ray field and energy deposition, and compare the3D models to 1D approximations.

Properties of gamma-ray decay lines in 3D core-collapse supernova models, with application to SN 1987A and Cas A