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Determining the Type, Redshift, and Age of a Supernova Spectrum

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Blondin, Stephane, Tonry, John L.·2007·The Astrophysical Journal

DOI 10.1086/520494

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Abstract

We present an algorithm to identify the type of an SN spectrum and to determine its redshift and age. This algorithm, based on the correlation techniques of Tonry & Davis, is implemented in the Supernova Identification (SNID) code. It is used by members of ongoing high-redshift SN searches to distinguish between Type Ia and Ib/c SNe and to identify "peculiar" SNe Ia. We develop a diagnostic to quantify the quality of a correlation between the input and template spectra, which enables a formal evaluation of the associated redshift error. Furthermore, by comparing the correlation redshifts obtained using SNID with those determined from narrow lines in the SN host galaxy spectrum, we show that accurate redshifts (with a typical error σ z ≲ 0.01) can be determined for SNe Ia without a spectrum of the host galaxy. Last, the age of an input spectrum is determined with a typical accuracy σ t ≲ 3 days, shown here by using high-redshift SNe Ia with well-sampled light curves. The success of the correlation technique confirms the similarity of some SNe Ia at low and high redshifts. The SNID code, which will be made available to the community, can also be used for comparative studies of SN spectra, as well as comparisons between data and models.

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Possible Applications of Supernovae to the Study of the Nebular Red Shifts.
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Spectra of High-Redshift Type Ia Supernovae and a Comparison with Their Low-Redshift Counterparts
Hook, I., Howell, D. A., Aldering, G., Amanullah, R., Burns, M. S., Conley, A., Deustua, S. E., Ellis, R. S., Fabbro, S., Fadeyev, V., et al. (2005) · The Astronomical Journal · doi:10.1086/497635 · Cited by 60
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Bayesian Single-Epoch Photometric Classification of Supernovae
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A Definitive Measurement of Time Dilation in the Spectral Evolution of the Moderate-Redshift Type Ia Supernova 1997ex
Foley, R. J., Filippenko, A. V., Leonard, D. C., Riess, A. G., Nugent, P., & Perlmutter, S. (2005) · The Astrophysical Journal · doi:10.1086/431241 · Cited by 52
Early Ultraviolet, Optical, and X‐Ray Observations of the Type IIP SN 2005cs in M51 withSwift
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The Luminous Type Ic Supernova 1992ar at \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $z=0.145$ \end{document}
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Self-citation
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See all 507

Authors: Blondin, S., & Tonry, J. L.
Venue: The Astrophysical Journal
Publisher: American Astronomical Society
Published: 2007-09-10
Volume: 666
Issue: 2
Pages: 1024-1047
ISSN: 0004-637X (ISSN-L)
1538-4357
DOI: 10.1086/520494
OpenAlex: W2070951133
Cited by: 507
References: 88
FWCI: 9.06
Type: journal article
Language: en
Open access: bronze

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Determining the Type, Redshift, and Age of a Supernova Spectrum

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