SIMBAD references

2005ApJ...620L..87W - Astrophys. J., 620, L87-L90 (2005/February-3)

A novel color parameter as a luminosity calibrator for type Ia supernovae.

WANG X., WANG L., ZHOU X., LOU Y.-Q. and LI Z.

Abstract (from CDS):

Type Ia supernovae (SNe Ia) provide us with a unique tool for measuring extragalactic distances and determining cosmological parameters. As a result, the precise and effective calibration for peak luminosities of SNe Ia becomes extremely crucial and thus is critically scrutinized for cosmological explorations. In this Letter, we reveal clear evidence for a tight linear correlation between peak luminosities of SNe Ia and their B-V colors ∼12 days after the B maximum denoted by ΔC12. By introducing such a novel color parameter, ΔC12, this empirical correlation allows us to uniformly standardize SNe Ia with decline rates Δm15in the range of 0.8<Δm15<2.0 and to reduce scatters in estimating their peak luminosities from ∼0.5 mag to the levels of 0.18 and 0.12 mag in the V and I bands, respectively. For a sample of SNe Ia with insignificant reddenings of host galaxies [e.g., E(B-V)host≲0.06 mag], the scatter drops further to only 0.07 mag (or 3%-4% in distance), which is comparable to observational accuracies and is better than other calibrations for SNe Ia. This would impact observational and theoretical studies of SNe Ia and cosmological scales and parameters.

Abstract Copyright:

Journal keyword(s): Cosmology: Cosmological Parameters - Cosmology: Distance Scale - Stars: Supernovae: General

Simbad objects: 10

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2005ApJ...620L..87W and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact