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

	A novel color parameter as a luminosity calibrator for type Ia supernovae
	Wang, XF; Wang, LF ; Zhou, X; Lou, YQ ; Li, ZW
刊名	ASTROPHYSICAL JOURNAL
	2005-02-20
卷号	620 期号:2 页码:L87-L90
关键词	cosmological parameters distance scale supernovae : general
英文摘要	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 similar to 12 days after the B maximum denoted by DeltaC(12). By introducing such a novel color parameter, DeltaC(12), this empirical correlation allows us to uniformly standardize SNe Ia with decline rates Deltam(15) in the range of 0.8 < &UDelta;m(15) < 2.0 and to reduce scatters in estimating their peak luminosities from similar to0.5 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) less than or similar to 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.
收录类别	SCI
语种	英语
WOS记录号	WOS:000227406000004
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/7019]
专题	国家天文台_光学天文研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ China, Beijing 100012, Peoples R China 2.Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China 3.Tsing Hua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China 4.Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA 5.Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA 6.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Wang, XF,Wang, LF,Zhou, X,et al. A novel color parameter as a luminosity calibrator for type Ia supernovae[J]. ASTROPHYSICAL JOURNAL,2005,620(2):L87-L90.
APA	Wang, XF,Wang, LF,Zhou, X,Lou, YQ,&Li, ZW.(2005).A novel color parameter as a luminosity calibrator for type Ia supernovae.ASTROPHYSICAL JOURNAL,620(2),L87-L90.
MLA	Wang, XF,et al."A novel color parameter as a luminosity calibrator for type Ia supernovae".ASTROPHYSICAL JOURNAL 620.2(2005):L87-L90.