Detection of circumstellar material in a normal Type Ia Supernova

Details Detection of circumstellar material in a normal Type Ia Supernova Detection of circumstellar material in a normal Type Ia Supernova

2007-07-18

arxiv.org/abs/0707.2793v1

Astronomy and Astrophysics

Astrophysics

25 pages, 7 figures. Accepted for publication in Science. Full resolution version at http://www.hq.eso.org/~fpatat/science/s

Scientific paper

10.1126/science.1143005

Type Ia supernovae are thought to be thermonuclear explosions of accreting white dwarfs that reach a critical mass limit. Despite their importance as cosmological distance indicators, the nature of their progenitors has remained controversial. Here we report the detection of circumstellar material in a normal Type Ia supernova. The expansion velocities, densities and dimensions of the circumstellar envelope indicate that this material was ejected from the progenitor system. The relatively low expansion velocities appear to favor a progenitor system where a white dwarf accretes material from a companion star which is in the red-giant phase at the time of explosion.

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