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Early phase optical spectra of aspherical jet-like supernovae (SNe) arepresented. We focus on energetic core-collapse SNe, or hypernovae. Based onhydrodynamic and nucleosynthetic models, radiative transfer in SN atmosphere issolved with a multi-dimensional Monte-Carlo radiative transfer code, SAMURAI.Since the luminosity is boosted in the jet direction, the temperature there ishigher than in the equatorial plane by ~ 2,000 K. This causes anisotropicionization in the ejecta. Emergent spectra are different depending on viewingangle, reflecting both aspherical abundance distribution and anisotropicionization. Spectra computed with an aspherical explosion model with kineticenergy 20 x 10^{51} ergs are compatible with those of the Type Ic SN 1998bw if~ 10-20% of the synthesized metals are mixed out to higher velocities. Thesimulations enable us to predict the properties of off-axis hypernovae. Even ifan aspherical hypernova explosion is observed from the side, it should showhypernova-like spectra but with some differences in the line velocity, thewidth of the Fe absorptions and the strength of the Na I line.

Multi-Dimensional Simulations for Early Phase Spectra of Aspherical Hypernovae: SN 1998bw and Off-Axis Hypernovae