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We explore the observational characteristics of jet-driven supernovae bysimulating bipolar-jet-driven explosions in a red supergiant progenitor. Wepresent results of four models in which we hold the injected kinetic energy ata constant $10^{51}$ ergs across all jet models but vary the specificcharacteristics of the jets to explore the influence of the nature of jets onthe structure of the supernova ejecta. We evolve the explosions pastshock-breakout and into quasi-homologous expansion of the supernova envelopeinto a red supergiant wind. The oppositely-directed, nickel-rich jets give alarge-scale asymmetry that may account for the non-spherical excitation andsubstructure of spectral lines such as H$\alpha$ and He I 10830\AA. Jets with alarge fraction of kinetic to thermal energy punch through the progenitorenvelope and give rise to explosions that would be observed to be asymmetricfrom the earliest epochs, inconsistent with spectropolarimetric measurements ofType II supernovae. Jets with higher thermal energy fractions result inexplosions that are roughly spherical at large radii but are significantlyelongated at smaller radii, deep inside the ejecta, in agreement with thepolarimetric observations. We present shock breakout light curves that indicatethat strongly aspherical shock breakouts are incompatible with recent {\itGALEX} observations of shock breakout from red supergiant stars. Comparisonwith observations indicates that jets must deposit their kinetic energyefficiently throughout the ejecta while in the hydrogen envelope. Thermalenergy-dominated jets satisfy this criterion and yield many of theobservational characteristics of Type II supernovae.

Aspherical Core-Collapse Supernovae in Red Supergiants Powered by Nonrelativistic Jets