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Spectropolarimetry of Type Ibc Supernovae

Published online by Cambridge University Press:  05 September 2012

Masaomi Tanaka
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo, Japan email: masaomi.tanaka@nao.ac.jp
Koji S. Kawabata
Affiliation:
Hiroshima Astrophysical Science Center, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
Takashi Hattori
Affiliation:
Subaru Telescope, National Astronomical Observatory of Japan, Hilo, HI
Paolo A. Mazzali
Affiliation:
Max-Planck Institut für Astrophysik, Karl-Schwarzschild-Strasse 2 D-85748 Garching bei München, Germany Istituto Naz. di Astrofisica-Oss. Astron., vicolo dell'Osservatorio, 5, 35122 Padova, Italy
Kentaro Aoki
Affiliation:
Subaru Telescope, National Astronomical Observatory of Japan, Hilo, HI
Masanori Iye
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo, Japan email: masaomi.tanaka@nao.ac.jp
Keiichi Maeda
Affiliation:
Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwa, Japan
Ken'ichi Nomoto
Affiliation:
Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwa, Japan
Elena Pian
Affiliation:
Istituto Naz. di Astrofisica-Oss. Astron., Via Tiepolo, 11, 34131 Trieste, Italy
Toshiyuki Sasaki
Affiliation:
Subaru Telescope, National Astronomical Observatory of Japan, Hilo, HI
Masayuki Yamanaka
Affiliation:
Hiroshima Astrophysical Science Center, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan Department of Physical Science, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
Corresponding
E-mail address:
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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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2012

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