Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20920002k&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #200.02; Bulletin of the American Astronomical Society,
Mathematics
Logic
Scientific paper
Several large observational campaigns are now underway to collect light curves and spectra for a large sample of Type Ia supernovae (SNe Ia). The ultimate goal is to monitor and limit any intrinsic variations in SNe Ia which could potentially bias our measurements of cosmological distances. Here I discuss a parallel theoretical effort to explore the diversity of SN Ia explosions using numerical simulations. We have constructed a grid of 130 parameterized models which span essentially the entire range of conceivable explosions a Chandrasekhar mass white dwarf. For each model we calculate the broadband light curves and full spectral time series. Within the resulting templates are models that provide good photometric and spectroscopic matches to essentially the entire range of observed SNe Ia. However, in contrast to the observations, the models span a wide range in B-band peak luminosity and decline rates and do not obey a tight width-luminosity relation. The potential diversity of SNe Ia light curves is therefore large. Apparently only a small subset of the theoretically conceivable explosions is realized in nature, placing tight constraints on the underlying explosion paradigm. Analysis of the model grid provides important insights into the physical origin of the SN Ia width-luminosity relationship and the secondary parameters that lead to dispersion from it.
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