Double-peaked Oxygen Lines Are not Rare in Nebular Spectra of Core-Collapse Supernovae

Details Double-peaked Oxygen Lines Are not Rare in Nebular Spectra of Core-Collapse Supernovae Double-peaked Oxygen Lines Are not Rare in Nebular Spectra of Core-Collapse Supernovae

2007-12-31

arxiv.org/abs/0801.0221v2

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, emulateapj, v2: accepted ApJ Letters version

Scientific paper

10.1086/593135

Double-peaked oxygen lines in the nebular spectra of two peculiar Type Ib/c Supernovae (SN Ib/c) have been interpreted as off-axis views of a GRB-jet or unipolar blob ejections. Here we present late-time spectra of 8 SN 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 mis-directed GRB jet.

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