Asphericity in supernova explosions from late-time spectroscopy |
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| Authors: | Maeda Keiichi Kawabata Koji Mazzali Paolo A Tanaka Masaomi Valenti Stefano Nomoto Ken'ichi Hattori Takashi Deng Jinsong Pian Elena Taubenberger Stefan Iye Masanori Matheson Thomas Filippenko Alexei V Aoki Kentaro Kosugi George Ohyama Youichi Sasaki Toshiyuki Takata Tadafumi |
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| Institution: | Institute for the Physics and Mathematics of the Universe (IPMU), University of Tokyo, Kashiwa-no-ha 5-1-5, Kashiwa City, Chiba 277-8582, Japan. maeda@ea.c.u-tokyo.ac.jp |
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| Abstract: | Core-collapse supernovae (CC-SNe) are the explosions that announce the death of massive stars. Some CC-SNe are linked to long-duration gamma-ray bursts (GRBs) and are highly aspherical. One important question is to what extent asphericity is common to all CC-SNe. Here we present late-time spectra for a number of CC-SNe from stripped-envelope stars and use them to explore any asphericity generated in the inner part of the exploding star, near the site of collapse. A range of oxygen emission-line profiles is observed, including a high incidence of double-peaked profiles, a distinct signature of an aspherical explosion. Our results suggest that all CC-SNe from stripped-envelope stars are aspherical explosions and that SNe accompanied by GRBs exhibit the highest degree of asphericity. |
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