期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 687, 期 1, 页码 L9-L12出版社
IOP PUBLISHING LTD
DOI: 10.1086/593135
关键词
gamma rays: bursts; supernovae: general
资金
- National Science Foundation [AST 06-06772]
- Kavli Institute for Theoretical Physics NSF [PHY 99-07949]
- Miller Institute for Basic Research
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0907903] Funding Source: National Science Foundation
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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