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Spectropolarimetry of Type Ibc Supernovae

  • Masaomi Tanaka (a1), Koji S. Kawabata (a2), Takashi Hattori (a3), Paolo A. Mazzali (a4) (a5), Kentaro Aoki (a3), Masanori Iye (a1), Keiichi Maeda (a6), Ken'ichi Nomoto (a6), Elena Pian (a7), Toshiyuki Sasaki (a3) and Masayuki Yamanaka (a2) (a8)...

Abstract

Studying a multi-dimensional structure of supernovae (SNe) gives important constraints on the mechanism of the SN explosion. Polarization measurement is one of the most powerful methods to study the explosion geometry of extragalactic SNe. Especially, Type Ib/c SNe are the ideal targets because the core of the explosion is bare. We have performed spectropolarimetric observations of Type Ib/c SNe with the Subaru telescope. We detect a rotation of the polarization angle across the line, which is seen as a loop in the Q - U plane. This indicates that axisymmetry is broken in the SN ejecta. Adding our new data to the sample of stripped-envelope SNe with high-quality spectropolarimetric data, five SNe out of six show a loop in the Q - U plane. This implies that the SN explosion commonly has a non-axisymmetric, three-dimensional geometry.

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Spectropolarimetry of Type Ibc Supernovae

  • Masaomi Tanaka (a1), Koji S. Kawabata (a2), Takashi Hattori (a3), Paolo A. Mazzali (a4) (a5), Kentaro Aoki (a3), Masanori Iye (a1), Keiichi Maeda (a6), Ken'ichi Nomoto (a6), Elena Pian (a7), Toshiyuki Sasaki (a3) and Masayuki Yamanaka (a2) (a8)...

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