Type Ia Supernova Color Curves: Disentangling Intrinsic Variations from Dust

Details Type Ia Supernova Color Curves: Disentangling Intrinsic Variations from Dust Type Ia Supernova Color Curves: Disentangling Intrinsic Variations from Dust

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924210b&link_type=abstract

American Astronomical Society, AAS Meeting #219, #242.10

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Scientific paper

Type Ia supernovae (SNe Ia) are important cosmological tools based on their use as "standard candles": as objects of similar intrinsic luminosity, their variations in apparent brightness are a reliable indication of relative distance. The more accurately we can measure and correct for variations in SN Ia brightness, the more precisely we can determine cosmological distances and place constraints on cosmological parameters including the Hubble constant and the nature of dark energy.
Corrections for dust along the line of sight to the SN are usually based on its reddening effect; however, recent studies have shown that the relationship between extinction and reddening of SN light curves does not match canonical values for standard, Milky Way-like dust. It is likely that color variations intrinsic to the SNe themselves are confounding our ability to independently determine the dust extinction and reddening.
Using ground-based photometry of several hundred SNe from the published literature, we present an analysis that attempts to disentangle the effects of dust and intrinsic color variations by looking at the time dependence of SNe Ia colors, controlling for light curve shape properties by empirically matching similar objects.

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