Asphericity in Supernova Explosions from Late-Time Spectroscopy

Details Asphericity in Supernova Explosions from Late-Time Spectroscopy Asphericity in Supernova Explosions from Late-Time Spectroscopy

2008-01-07

arxiv.org/abs/0801.1100v3

Astronomy and Astrophysics

Astrophysics

Science 319, 1220 (2008) (29 February 2008 issue). Submitted on 20 August 2007, accepted on 17 January 2008. The resolution of

Scientific paper

10.1126/science.1149437

Core-collapse supernovae (CC-SNe) are the explosions that announce the death of massive stars. Some CC-SNe are linked to long-duration gamma-ray bursts (GRBs) and are highly aspherical. One important question is to what extent asphericity is common to all CC-SNe. Here we present late-time spectra for a number of CC-SNe from stripped-envelope stars, and use them to explore any asphericity generated in the inner part of the exploding star, near the site of collapse. A range 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 CC-SNe from stripped-envelope stars are aspherical explosions and that SNe accompanied by GRBs exhibit the highest degree of asphericity.

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