Physics – Nuclear Physics
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21730802c&link_type=abstract
American Astronomical Society, AAS Meeting #217, #308.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Physics
Nuclear Physics
Scientific paper
Type Ia supernovae (SNe Ia) are the premier standard candle for measuring the expansion history of the universe. SNe Ia make good standard candles only because their light curves can be calibrated. However, observations indicate even after calibration SNe Ia light curves have some dependence on properties of the host galaxy. Numerical models are steadily becoming more refined and can begin to probe the connection between the properties of the progenitor white dwarf and the outcome of the explosion. We perform numerical calculations to examine the effect of metallicity on the nucleosynthesis taking place in SNe Ia. Detailed yields resulting from explosive burning of the carbon/oxygen plasma in our models are examined using post-processing through a 532-nuclide reaction network. We explore how the production of elements from silicon to titanium varies with metallicity of the progenitor star. Our calculations suggest systematic trends in the silicon-group elements that may be observable. There is a clear trend with increasing metallicity of increasing silicon production while all other intermediate mass elements are produced in smaller abundances. We find, for example, that calcium follows a nearly linear trend of decreasing production with increasing metallicity.
This work was supported by the US Department of Energy, Office of Nuclear Physics, under contract DE-AC02-06CH11357.
Brown Edward F.
Calder Alan C.
Chamulak David
Jackson Aaron P.
Krueger Brendan K.
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