Other
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21642805s&link_type=abstract
American Astronomical Society, AAS Meeting #216, #428.05; Bulletin of the American Astronomical Society, Vol. 41, p.841
Other
Scientific paper
Type Ia Supernovae(SNe Ia) have large and very homogeneous luminosities, making them an important tool for measuring distances on a cosmic scale, helping to study the evolution of the Universe. However, the nature of the progenitor system of these explosions is still uncertain. The consensus view is that SNe Ia originate from a close binary system, where matter from a companion is accreted onto a white dwarf (WD) star. As the mass of the WD approaches the critical Chandrasekhar limit, it undergoes a thermonuclear explosion. In the single degenerate (SD) model the mass donor is either a main sequence or an evolved subgiant or giant star, while the double degenerate (DD) model involves a second WD as the mass donor. In the SD model non-accreted material blown away from the system prior to the explosion would remain as circumstellar material (CSM). Therefore, detection of CSM in SNe Ia spectra would support the SD model. Recently, such detections were reported for three SNe Ia (SN2006X, SN 1999cl and SN 2007le), manifest as variable Na D absorption, though these have been disputed by other authors. We report the analysis of a sample of 20 SN Ia spectra obtained using the Keck HIRES spectrograph, of which 13 show significant Na D absorption. We report a statistical preference for blue-shifted absorption structures (similar to those seen in SN 2006X and SN 2007le). This apparent asymmetry suggests that most of these features are intrinsic to the SNe themselves, supporting the SD model for the progenitor system of a significant fraction of SNe Ia.
Gal-Yam Avishay
Simon Joshua D.
Sternberg Assaf
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