Maeda 2008 Asymmetry SN explosion analysis by Spectroscopy

主要内容:
From the emission line of (mainly) OI, one can derive the velocity in the different part of the explosion, and derive the asymmetric explosion.

精彩摘抄:
Spectra for different SNe for OI emission line.

the line and the relation of velocity.

文章信息: Asymmetry in Supernova Explosions from Late-Time Spectroscopy

Authors: Keiichi Maeda, Koji Kawabata, Paolo A. Mazzali, Masaomi Tanaka, Stefano Valenti, Ken'ichi Nomoto, Takashi Hattori, Jinsong Deng, Elena Pian, Stefan Taubenberger, Masanori Iye, Thomas Matheson, Alexei V. Filippenko, Kentaro Aoki, George Kosugi, Youichi Ohyama, Toshiyuki Sasaki, Tadafumi Takata

(Submitted on 7 Jan 2008)

Abstract: Core-collapse supernovae (CC-SNe) are the explosion following the death of massive stars. Some of them are linked to long-duration gamma-ray bursts (GRBs). One important question is whether all CC-SNe share common features in their explosion mechanism. Here we present late-time spectra for a number of stripped-envelope CC-SNe, and use them to explore any asphericity generated in the inner part of the exploding star, near the site of collapse. A variety 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 stripped-envelope CC-SNe are aspherical, perhaps jet-driven explosions, and that SNe accompanied by GRBs exhibit the highest degree of asphericity.

Comments:	Submitted to Science on 17 August 2007. An original submitted version, except that the resolution of SOM Figure 1 is lower than the original. Includes Supporting Online Material (SOM), 24 pages, 3 figures, 1 table, and 2 SOM figures and 1 SOM table
Subjects:	Astrophysics (astro-ph)
Cite as:	arXiv:0801.1100v1 [astro-ph]