Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21349008c&link_type=abstract
American Astronomical Society, AAS Meeting #213, #490.08; Bulletin of the American Astronomical Society, Vol. 41, p.466
Astronomy and Astrophysics
Astronomy
Scientific paper
Compounding observational evidence indicates that core-collapse supernovae of all types are aspherical. Spectropolarimetry reveals that supernovae routinely have a preferred geometrical axis around which there is evidence for non-axisymmetric structure. Additionally, in some cases the polarimetry is time-dependent with the time-dependence related to the envelope size of the progenitor star. Fine structure in spectral lines, particularly the H-alpha and He I lines, imply the presence of fast-moving nickel clumps in the ejecta of many supernovae. We present a study of the observable characteristics of jet-driven core-collapse supernovae. We perform simulations of bipolar-jet-driven explosions in various supernova progenitor models, including red supergiants, with varied jet parameters. We evolve our calculations beyond shock breakout and into quasi-homologous expansion. We compare our results to observations of core-collapse supernovae and discuss the implications the observations have for the nature of the supernova mechanism.
Couch Sean M.
Milosavljevic Milos
Wheeler John
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