Constraining cosmic evolution of type Ia supernovae

Foley, Ryan J., Filippenko, Alexei V., Aguilera, C., Becker, A. C., Blondin, S., Challis, P., Clocchiatti, A., Covarrubias, R., Davis, T. M., Garnavich, P. M., Jha, S. W., Kirshner, R. P., Krisciunas, K., Leibundgut, B., Li, W., Matheson, T., Miceli, A., Miknaitis, G., Pignata, G., Rest, A., Riess, A. G., Schmidt, B. P., Smith, R. C., Sollerman, J., Spyromilio, J., Stubbs, C. W., Suntzeff, N. B., Tonry, J. L., Wood-Vasey, W. M. and Zenteno, A. (2008) Constraining cosmic evolution of type Ia supernovae. The Astrophysical Journal: an international review of astronomy and astronomical physics, 684 1: 68-87. doi:10.1086/589612

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Author Foley, Ryan J.
Filippenko, Alexei V.
Aguilera, C.
Becker, A. C.
Blondin, S.
Challis, P.
Clocchiatti, A.
Covarrubias, R.
Davis, T. M.
Garnavich, P. M.
Jha, S. W.
Kirshner, R. P.
Krisciunas, K.
Leibundgut, B.
Li, W.
Matheson, T.
Miceli, A.
Miknaitis, G.
Pignata, G.
Rest, A.
Riess, A. G.
Schmidt, B. P.
Smith, R. C.
Sollerman, J.
Spyromilio, J.
Stubbs, C. W.
Suntzeff, N. B.
Tonry, J. L.
Wood-Vasey, W. M.
Zenteno, A.
Title Constraining cosmic evolution of type Ia supernovae
Journal name The Astrophysical Journal: an international review of astronomy and astronomical physics   Check publisher's open access policy
ISSN 0004-637X
Publication date 2008-09
Sub-type Article (original research)
DOI 10.1086/589612
Open Access Status File (Publisher version)
Volume 684
Issue 1
Start page 68
End page 87
Total pages 20
Place of publication Philadelphia, PA, United States
Publisher Institute of Physics
Language eng
Subject 0201 Astronomical and Space Sciences
Abstract We present a large-scale effort of creating composite spectra of high-redshift SNe Ia and comparing them to low-redshift counterparts in an attempt to understand possible cosmic evolution of SNe Ia, which has major implications for studies of dark energy. Through the ESSENCE project, we have obtained 107 spectra of 88 high-redshift SNe Ia with excellent light-curve information. In addition, we have obtained 397 spectra of low-redshift SNe Ia through a multiple-decade effort at the Lick and Keck Observatories, and we have used 45 UV spectra obtained by HST and IUE. The low-redshift spectra act as a control sample when comparing to the ESSENCE spectra. In all instances, the ESSENCE and Lick composite spectra appear very similar. The addition of galaxy light to the Lick composite spectra allows an excellent match of the overall SED with the ESSENCE composite spectra, indicating that the high-redshift SNe are more contaminated with host galaxy light than their low-redshift counterparts. This is caused by observing objects at all redshifts with similar angular slit widths, which corresponds to different projected physical distances. After correcting for the galaxy light contamination, a few marginally significant differences in the spectra remain. We have estimated the systematic errors when using current spectral templates for K-corrections to be ~0.02 mag. The variance in the composite spectra gives an estimate of the intrinsic variance in low-redshift maximum light SN spectra of ~3% relative flux in the optical and growing toward the UV. The difference between the maximum light low- and high-redshift spectra constrains the evolution of SN spectral features between our samples to be <10% relative flux in the rest-frame optical. Currently, galaxy contamination and the small samples of rest-frame UV spectra at low and high redshifts are the limiting factors for future studies.
Keyword Ccosmology
Distance scale
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Mathematics and Physics
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Citation counts: TR Web of Science Citation Count  Cited 44 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 45 times in Scopus Article | Citations
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Created: Tue, 16 Feb 2010, 12:09:06 EST by Ms May Balasaize on behalf of Faculty of Science