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Asymmetric Explosion of Type Ia Supernovae as Seen from Near Infrared Observations

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arxiv astro-ph/0610303 v2 pith:4MB3AR5B submitted 2006-10-11 astro-ph

K. Motohara , K. Maeda , C. L. Gerardy , K. Nomoto , M. Tanaka , N. Tominaga , T. Ohkubo , P. A. Mazzali
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R. A. Fesen P. Hoeflich J. C. Wheeler
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keywords explosionlineseenshiftsupernovaetypeadditionasymmetric
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We present near-infrared spectra of late phase (>200 d) Type Ia supernovae (SNe Ia) taken at the Subaru telescope. The [Fe II] line of SN 2003hv shows a clear flat-topped feature, while that of SN 2005W show less prominent flatness. In addition, a large shift in their line center, varying from -3000 to 1000 (km/s) with respect to the host galaxies, is seen. Such a shift suggests the occurrence of an off-center, non-spherical explosion in the central region, and provides important, new constraints on the explosion models of SNe Ia.

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