Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-01-20
Astrophys.J. 622 (2005) L41-L44
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures. To appear in ApJ Letters. For higher resolution images and movies see http://panisse.lbl.gov/~dnkasen/gcd.
Scientific paper
10.1086/429375
We consider some of the spectral and polarimetric signatures of the gravitational confined detonation scenario for Type Ia supernova explosions. In this model, material produced by an off-center deflagration (which itself fails to produce the explosion) forms a metal-rich atmosphere above the white dwarf surface. Using hydrodynamical simulations, we show that this atmosphere is compressed and accelerated during the subsequent interaction with the supernova ejecta. This leads ultimately to the formation of a high-velocity pancake of metal-rich material that is geometrically detached from the bulk of the ejecta. When observed at the epochs near maximum light, this absorbing pancake produces a highly blueshifted and polarized calcium IR triplet absorption feature similar to that observed in several Type~Ia supernovae. We discuss the orientation effects present in our model and contrast them to those expected in other supernova explosion models. We propose that a large sample of spectropolarimetric observations can be used to critically evaluate the different theoretical scenarios.
Kasen Daniel
Plewa Tomasz
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