THE MEAN TYPE IA SUPERNOVA SPECTRUM OVER THE PAST NINE GIGAYEARS

被引：36

作者：

Sullivan, M. ^{[1
]}

Ellis, R. S. ^{[1
,2
]}

Howell, D. A. ^{[3
,4
]}

Riess, A. ^{[5
]}

Nugent, P. E. ^{[6
]}

Gal-Yam, A. ^{[7
]}

机构：

[1] Univ Oxford, Dept Astrophys, Oxford OX1 3RH, England

[2] CALTECH, Dept Astrophys, Pasadena, CA 91125 USA

[3] Las Cumbres Observ Global Telescope Network, Goleta, CA 93117 USA

[4] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[5] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[6] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[7] Weizmann Inst Sci, Fac Phys, Astrophys Grp, IL-76100 Rehovot, Israel

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2009年 / 693卷 / 02期

关键词：

cosmological parameters; supernovae: general; ultraviolet: general; HUBBLE-SPACE-TELESCOPE; ULTRAVIOLET-SPECTRA; LIGHT CURVES; INDICATORS; EVOLUTION; REDSHIFT; OMEGA(M); DIAGRAM; MASS;

D O I：

10.1088/0004-637X/693/2/L76

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We examine the possibility of evolution with redshift in the mean rest-frame ultraviolet (UV; lambda less than or similar to 4500 angstrom) spectrum of Type Ia Supernovae (SNe Ia) sampling the redshift range 0 < z < 1.3. We find new evidence for a decrease with redshift in the strength of intermediate-mass element (IME) features, particularly Si II and to a lesser extent Ca II "H&K" and Mg II blends, indicating lower IME abundances in the higher redshift SNe. A larger fraction of luminous, wider light-curve width (higher "stretch") SNe Ia are expected at higher redshift than locally, so we compare our observed spectral evolution with that predicted by a redshift-evolving stretch distribution coupled with a stretch-dependent SN Ia spectrum. We show that the sense of the spectral evolution can be reproduced by this simple model, though the highest redshift events seem additionally deficient in Si and Ca. We also examine the mean SN Ia UV-optical colors as a function of redshift, thought to be sensitive to variations in progenitor composition. We find that the expected stretch variations are sufficient to explain the differences, although improved data at z similar to 0 will enable more precise tests. Thus, to the extent possible with the available data sets, our results support the continued use of SNe Ia as standardized candles.

引用

页码：L76 / L80

页数：5

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