Mazzali 2005 Ic SN 2003jd可能是偏轴的伽玛暴

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Title:		An Asymmetric Energetic Type Ic Supernova Viewed Off-Axis, and a Link to Gamma Ray Bursts
Authors:		Mazzali, Paolo A.; Kawabata, Koji S.; Maeda, Keiichi; Nomoto, Ken'ichi; Filippenko, Alexei V.; Ramirez-Ruiz, Enrico; Benetti, Stefano; Pian, Elena; Deng, Jinsong; Tominaga, Nozomu; Ohyama, Youichi; Iye, Masanori; Foley, Ryan J.; Matheson, Thomas; Wang, Lifan; Gal-Yam, Avishay
Publication:		Science, Volume 308, Issue 5726, pp. 1284-1287 (2005).
Publication Date:		05/2005
Category:		ASTRONOMY
Origin:		SCIENCE
Abstract Copyright:		(c) 2005: Science
DOI:		10.1126/science.1111384
Bibliographic Code:		2005Sci...308.1284M

Abstract

Type Ic supernovae, the explosions after the core collapse of massive stars that have previously lost their hydrogen and helium envelopes, are particularly interesting because of their link with long-duration gamma ray bursts. Although indications exist that these explosions are aspherical, direct evidence has been missing. Late-time observations of supernova SN 2003jd, a luminous type Ic supernova, provide such evidence. Recent Subaru and Keck spectra reveal double-peaked profiles in the nebular lines of neutral oxygen and magnesium. These profiles are different from those of known type Ic supernovae, with or without a gamma ray burst, and they can be understood if SN 2003jd was an aspherical axisymmetric explosion viewed from near the equatorial plane. If SN 2003jd was associated with a gamma ray burst, we missed the burst because it was pointing away from us.

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