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High-velocity features in Type Ia supernova spectra provide a way to probethe outer layers of these explosions. The maximum-light spectra of the uniqueType Ia supernova 2000cx exhibit interesting Ca II features with high-velocitycomponents. The infrared triplet absorption is quadruply notched, while the H&Kabsorption is wide and flat. Stimulated by a three-dimensional interpretationof similar Ca II features in another Type Ia supernova (SN 2001el, Kasen et al.2003), we present alternative spherically symmetric and three-dimensionalejecta models to fit the high-velocity (v > 16,000 km/s) Ca II features of SN2000cx. We also present simple estimates of the high-velocity ejecta mass for afew trial compositions and discuss their implications for explosion modelling.Comment: 33 pages total, 13 figures, accepted by Ap

On the Geometry of the High‐Velocity Ejecta of the Peculiar Type Ia Supernova 2000cx