A Novel Color Parameter As A Luminosity Calibrator for Type Ia Supernovae

Details A Novel Color Parameter As A Luminosity Calibrator for Type Ia Supernovae A Novel Color Parameter As A Luminosity Calibrator for Type Ia Supernovae

2005-01-26

arxiv.org/abs/astro-ph/0501565v2

Astrophys.J. 620 (2005) L87-L90

Astronomy and Astrophysics

Astrophysics

13 pages, including 3 figures. To appear in ApJL (2005 Feb issue)

Scientific paper

10.1086/428774

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 $\sim 12$ days after the $B$ maximum denoted by $\Delta C_{12}$. By introducing such a novel color parameter, $\Delta C_{12}$, this empirical correlation allows us to uniformly standardize SNe Ia with decline rates $\Delta m_{15}$ in the range of $0.8<\Delta m_{15}<2.0$ and to reduce scatters in estimating their peak luminosities from $\sim 0.5$ 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$(B-V)_{host}\lsim 0.06$ 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.

Affiliated with

Also associated with

No associations

Rating

A Novel Color Parameter As A Luminosity Calibrator for Type Ia Supernovae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A Novel Color Parameter As A Luminosity Calibrator for Type Ia Supernovae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Novel Color Parameter As A Luminosity Calibrator for Type Ia Supernovae will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-626972