Intrinsic and extinction colour components in SNeIa and the determination of R_V
arXiv (Cornell University)(2023)
Abstract
The key ingredients in this attempt at separating for each supernova the
intrinsic and extinction colour components, and then measuring Rv , are the
assumptions of a linearized dependence of magnitudes on the extinction
component of colour, a one-dimensional extra-intrinsic colour space (in
addition to CaII H K λ3945 and Si II λ4131 contributions, and
the absence of correlations between intrinsic and extrinsic variabilities. A
consistent solution is found under the previous assumptions, but the observed
systematic trends point to a small inadequacy of the extinction formula. Once
corrected, all systematic extinction effects can be cancelled by choosing a
single scaling of the extinction colour component as well as the appropriate
value of Rv = 2.181 ± 0.117
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Key words
extinction colour components,sne ia,r_v
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