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

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

2003-02-13

arxiv.org/abs/astro-ph/0302260v2

Astrophys.J. 601 (2004) 1019-1030

Astronomy and Astrophysics

Astrophysics

33 pages total, 13 figures, accepted by ApJ

Scientific paper

10.1086/380632

High-velocity features in Type Ia supernova spectra provide a way to probe the outer layers of these explosions. The maximum-light spectra of the unique Type Ia supernova 2000cx exhibit interesting Ca II features with high-velocity components. The infrared triplet absorption is quadruply notched, while the H&K absorption is wide and flat. Stimulated by a three-dimensional interpretation of similar Ca II features in another Type Ia supernova (SN 2001el, Kasen et al. 2003), we present alternative spherically symmetric and three-dimensional ejecta models to fit the high-velocity (v > 16,000 km/s) Ca II features of SN 2000cx. We also present simple estimates of the high-velocity ejecta mass for a few trial compositions and discuss their implications for explosion modelling.

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