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Title:
Double-Peaked Oxygen Lines Are Not Rare in Nebular Spectra of Core-Collapse Supernovae
Authors:
Modjaz, M.; Kirshner, R. P.; Blondin, S.; Challis, P.; Matheson, T.
Affiliation:
AA(University of California, 601 Campbell Hall, Berkeley, CA 94720; .; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , .; Miller Research Fellow.), AB(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , .), AC(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , .), AD(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , .), AE(National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719-4933 .)
Publication:
The Astrophysical Journal, Volume 687, Issue 1, pp. L9-L12. (ApJ Homepage)
Publication Date:
11/2008
Origin:
UCP
ApJ Keywords:
Gamma Rays: Bursts, Stars: Supernovae: General
DOI:
10.1086/593135
Bibliographic Code:
2008ApJ...687L...9M

Abstract

Double-peaked oxygen lines in the nebular spectra of two peculiar Type Ib/c supernovae (SNe Ib/c) have been interpreted as off-axis views of a GRB jet or unipolar blob ejections. Here we present late-time spectra of eight SNe IIb, Ib, and Ic and show that this phenomenon is common and should not be so firmly linked to extraordinary explosion physics. The line profiles are most likely caused by ejecta expanding with a torus- or disk-like geometry. Double-peaked oxygen profiles are not necessarily the indicator of a misdirected GRB jet.
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