Time dilation from spectral feature age measurements of type Ia supernovae

A. G. Riess; A. V. Filippenko; D. C. Leonard; B. P. Schmidt; N. Suntzeff; M. M. Phillips; R. Schommer; A. Clocchiatti; R. P. Kirshner; P. Garnavich; P. Challis; B. Leibundgut; J. Spyromilio; R. C. Smith

doi:10.1086/118506

Time dilation from spectral feature age measurements of type Ia supernovae

A. G. Riess^*, A. V. Filippenko, D. C. Leonard, B. P. Schmidt, N. Suntzeff, M. M. Phillips, R. Schommer, A. Clocchiatti, R. P. Kirshner, P. Garnavich, P. Challis, B. Leibundgut, J. Spyromilio, R. C. Smith

^*Corresponding author for this work

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Abstract

We have developed a quantitative, empirical method for estimating the age of Type Ia supernovae (SNe Ia) from a single spectral epoch. The technique examines the goodness of fit of spectral features as a function of the temporal evolution of a large database of SNe Ia spectral features. When a SN Ia spectrum with good signal-to-noise ratio over the rest frame range 3800 to 6800 Å is available, the precision of a spectral feature age (SFA) is (1σ) ∼1.4 days. SFA estimates are made for two spectral epochs of SN 1996bj (z=0.574) to measure the rate of aging at high redshift. In the 10.05 days which elapsed between spectral observations, SN 1996bj aged 3.35±3.2 days, consistent with the 6.38 days of aging expected in an expanding Universe and inconsistent with no time dilation at the 96.4% confidence level. The precision to which individual features constrain the supernova age has implications for the source of inhomogeneities among SNe Ia.

Original language	English
Pages (from-to)	722-729
Number of pages	8
Journal	Astronomical Journal
Volume	114
Issue number	2
DOIs	https://doi.org/10.1086/118506
Publication status	Published - Aug 1997

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Riess, A. G., Filippenko, A. V., Leonard, D. C., Schmidt, B. P., Suntzeff, N., Phillips, M. M., Schommer, R., Clocchiatti, A., Kirshner, R. P., Garnavich, P., Challis, P., Leibundgut, B., Spyromilio, J., & Smith, R. C. (1997). Time dilation from spectral feature age measurements of type Ia supernovae. Astronomical Journal, 114(2), 722-729. https://doi.org/10.1086/118506

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title = "Time dilation from spectral feature age measurements of type Ia supernovae",

abstract = "We have developed a quantitative, empirical method for estimating the age of Type Ia supernovae (SNe Ia) from a single spectral epoch. The technique examines the goodness of fit of spectral features as a function of the temporal evolution of a large database of SNe Ia spectral features. When a SN Ia spectrum with good signal-to-noise ratio over the rest frame range 3800 to 6800 {\AA} is available, the precision of a spectral feature age (SFA) is (1σ) ∼1.4 days. SFA estimates are made for two spectral epochs of SN 1996bj (z=0.574) to measure the rate of aging at high redshift. In the 10.05 days which elapsed between spectral observations, SN 1996bj aged 3.35±3.2 days, consistent with the 6.38 days of aging expected in an expanding Universe and inconsistent with no time dilation at the 96.4\% confidence level. The precision to which individual features constrain the supernova age has implications for the source of inhomogeneities among SNe Ia.",

author = "Riess, \{A. G.\} and Filippenko, \{A. V.\} and Leonard, \{D. C.\} and Schmidt, \{B. P.\} and N. Suntzeff and Phillips, \{M. M.\} and R. Schommer and A. Clocchiatti and Kirshner, \{R. P.\} and P. Garnavich and P. Challis and B. Leibundgut and J. Spyromilio and Smith, \{R. C.\}",

year = "1997",

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doi = "10.1086/118506",

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T1 - Time dilation from spectral feature age measurements of type Ia supernovae

AU - Riess, A. G.

AU - Filippenko, A. V.

AU - Leonard, D. C.

AU - Schmidt, B. P.

AU - Suntzeff, N.

AU - Phillips, M. M.

AU - Schommer, R.

AU - Clocchiatti, A.

AU - Kirshner, R. P.

AU - Garnavich, P.

AU - Challis, P.

AU - Leibundgut, B.

AU - Spyromilio, J.

AU - Smith, R. C.

PY - 1997/8

Y1 - 1997/8

N2 - We have developed a quantitative, empirical method for estimating the age of Type Ia supernovae (SNe Ia) from a single spectral epoch. The technique examines the goodness of fit of spectral features as a function of the temporal evolution of a large database of SNe Ia spectral features. When a SN Ia spectrum with good signal-to-noise ratio over the rest frame range 3800 to 6800 Å is available, the precision of a spectral feature age (SFA) is (1σ) ∼1.4 days. SFA estimates are made for two spectral epochs of SN 1996bj (z=0.574) to measure the rate of aging at high redshift. In the 10.05 days which elapsed between spectral observations, SN 1996bj aged 3.35±3.2 days, consistent with the 6.38 days of aging expected in an expanding Universe and inconsistent with no time dilation at the 96.4% confidence level. The precision to which individual features constrain the supernova age has implications for the source of inhomogeneities among SNe Ia.

AB - We have developed a quantitative, empirical method for estimating the age of Type Ia supernovae (SNe Ia) from a single spectral epoch. The technique examines the goodness of fit of spectral features as a function of the temporal evolution of a large database of SNe Ia spectral features. When a SN Ia spectrum with good signal-to-noise ratio over the rest frame range 3800 to 6800 Å is available, the precision of a spectral feature age (SFA) is (1σ) ∼1.4 days. SFA estimates are made for two spectral epochs of SN 1996bj (z=0.574) to measure the rate of aging at high redshift. In the 10.05 days which elapsed between spectral observations, SN 1996bj aged 3.35±3.2 days, consistent with the 6.38 days of aging expected in an expanding Universe and inconsistent with no time dilation at the 96.4% confidence level. The precision to which individual features constrain the supernova age has implications for the source of inhomogeneities among SNe Ia.

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JO - Astronomical Journal

JF - Astronomical Journal

IS - 2

ER -

Time dilation from spectral feature age measurements of type Ia supernovae

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