Quote:
Originally Posted by Jerry
As a purely phenomenological assumption, this is no longer valid: We have seen light-curves in near-local supernova events that are longer than the light-curves available in 1994. So the question today should be: Are the more distant events more like the average, or more like the brightest and slowest burning of the locally-observed supernova events? This is where polarity, nickel content, expansion velocity, light curve shape, environment and other measurements of diversity in supernova events becomes critical. Once we know what makes some supernova events burn brighter and last longer, we can revisit the light curves of the most distant events and determine if they are truly time-dilated.
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There is more to supernova work than light curves -- spectra provide a great deal of information about the physical properties of the ejecta. Using good spectra, one can answer some questions about symmetry, nickel content, expansion velocity, the environment, etc.
I suggest that you do some reading in the literature. Look to see how many of the distant events have well-measured spectra, and how those spectra compare to those of nearby events.