2005ApJ...620L..87W


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET07:30:56

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

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 SN 1998de SN* 00 48 06.88 +27 37 28.5   17.56       SNIapec 78 1
2 SN 1992bc SN* 03 05 16.05 -39 33 34.6   15.15 15.17     SNIa 122 1
3 SN 1995E SN* 07 51 56.75 +73 00 34.6   16.81 15.9     SNIa 108 1
4 SN 2000ce SN* 08 05 09.45 +66 47 15.2   17.24       SNIa 56 1
5 SN 1999gd SN* 08 38 24.61 +25 45 33.1   16.94       SNIa 61 1
6 SN 1999by SN* 09 21 52.07 +51 00 06.6   13.66       SNIap 261 1
7 SN 1991bg SN* 12 25 03.70 +12 52 15.6   14.75 14.3     SNIapec 530 1
8 SN 1997cn SN* 14 09 57.76 +17 32 32.3   17.2 16.7     SNIapec 73 1
9 SN 1999da SN* 17 35 22.96 +60 48 49.3   16.84       SNIa 56 1
10 SN 1998bp SN* 17 54 50.74 +18 19 50.5   15.73       SNIa 62 1

    Equat.    Gal    SGal    Ecl

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2020.11.25-07:30:56

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