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The reddening law of type Ia supernovae: separating intrinsic variability from dust using equivalent widths
Chotard, N.1; Gangler, E.1; Aldering, G.2; Antilogus, P.3; Aragon, C.2; Bailey, S.2; Baltay, C.4; Bongard, S.3; Buton, C.5; Canto, A.3; Childress, M.2,6; Copin, Y.1; Fakhouri, H. K.2,6; Hsiao, E. Y.2; Kerschhaggl, M.5; Kowalski, M.5; Loken, S.2; Nugent, P.7,8; Paech, K.5; Pain, R.3; Pecontal, E.9,10; Pereira, R.1; Perlmutter, S.2,6; Rabinowitz, D.4; Runge, K.2; Scalzo, R.4,11; Smadja, G.1; Tao, C.12,13; Thomas, R. C.7; Weaver, B. A.14; Wu, C.3,15
AbstractWe employ 76 type Ia supernovae (SNe Ia) with optical spectrophotometry within 2.5 days of B-band maximum light obtained by the Nearby Supernova Factory to derive the impact of Si and Ca features on the supernovae intrinsic luminosity and determine a dust reddening law. We use the equivalent width of Si lambda 4131 in place of the light curve stretch to account for first-order intrinsic luminosity variability. The resulting empirical spectral reddening law exhibits strong features that are associated with Ca II and Si II lambda 6355. After applying a correction based on the Ca II H&K equivalent width we find a reddening law consistent with a Cardelli extinction law. Using the same input data, we compare this result to synthetic rest-frame UBVRI-like photometry to mimic literature observations. After corrections for signatures correlated with Si II lambda 4131 and Ca II H&K equivalent widths and introducing an empirical correlation between colors, we determine the dust component in each band. We find a value of the total-to-selective extinction ratio, R-V = 2.8 +/- 0.3. This agrees with the Milky Way value, in contrast to the low R-V values found in most previous analyses. This result suggests that the long-standing controversy in interpreting SN Ia colors and their compatibility with a classical extinction law, which is critical to their use as cosmological probes, can be explained by the treatment of the dispersion in colors, and by the variability of features apparent in SN Ia spectra.
KeywordSupernovae: General Cosmology: Observations Dust Extinction
Indexed BySCI
WOS IDWOS:000289557200005
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Cited Times:86[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Univ Lyon 1, CNRS, IN2P3, Inst Phys Nucl Lyon, F-69622 Villeurbanne, France
2.Univ Calif Berkeley, Lawrence Berkeley Lab, Div Phys, Berkeley, CA 94720 USA
3.Univ Paris 07, Univ Paris 06, LPNHE, CNRS,IN2P3, F-75252 Paris 05, France
4.Yale Univ, Dept Phys, New Haven, CT 06250 USA
5.Univ Bonn, Inst Phys, D-53115 Bonn, Germany
6.Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
7.Univ Calif Berkeley, Lawrence Berkeley Lab, Computat Cosmol Ctr, Berkeley, CA 94720 USA
8.Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
9.Univ Lyon 1, F-69003 Lyon, France
10.Observ Lyon, F-69230 St Genis Laval, France
11.Australian Natl Univ, RSAA, Mt Stromlo Observ, Weston, ACT 2611, Australia
12.Ctr Phys Particules Marseille, F-13288 Marseille 09, France
13.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China
14.NYU, Ctr Cosmol & Particle Phys, New York, NY 10003 USA
15.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Chotard, N.,Gangler, E.,Aldering, G.,et al. The reddening law of type Ia supernovae: separating intrinsic variability from dust using equivalent widths[J]. ASTRONOMY & ASTROPHYSICS,2011,529.
APA Chotard, N..,Gangler, E..,Aldering, G..,Antilogus, P..,Aragon, C..,...&Wu, C..(2011).The reddening law of type Ia supernovae: separating intrinsic variability from dust using equivalent widths.ASTRONOMY & ASTROPHYSICS,529.
MLA Chotard, N.,et al."The reddening law of type Ia supernovae: separating intrinsic variability from dust using equivalent widths".ASTRONOMY & ASTROPHYSICS 529(2011).
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