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Evidence for Circumstellar Material in Type Ia Supernovae via Sodium Absorption Features

Published online by Cambridge University Press:  17 January 2013

Assaf Sternberg
Assaf Sternberg*
Affiliation:
Benoziyo Center for Astrophysics, Faculty of Physics, Weizmann Institute of Science, Rehovot 76100, Israel email: assaf.sternberg@weizmann.ac.il
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Abstract

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Type Ia supernovae are very good tools for measuring distances on a cosmic scale. The consensus view is that mass transfer onto a white dwarf in a close binary system leads to a thermonuclear explosion, though the nature of the mass donor is still uncertain. In the single-degenerate model it is a main-sequence star or an evolved star. In the double-degenerate model it is another white dwarf. We study the velocity structure of absorbing material along the line of sight to 35 Type Ia supernovae and find a statistical preference for blueshifted structures, likely arising in gas outflows from the supernova progenitor systems, consistent with a single-degenerate progenitor for a substantial fraction of Type Ia supernovae in nearby spiral galaxies.

Keywords

stars: supernovaecircumstellar matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Issue S281: Binary Paths to Type Ia Supernovae Explosions , July 2011 , pp. 299 - 302
Copyright
Copyright © International Astronomical Union 2013

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