Timescale Stretch Parameterization of Type Ia Supernova B-Band Light Curves

G. Goldhaber; D. E. Groom; A. Kim; G. Aldering; P. Astier; A. Conley; S. E. Deustua; R. Ellis; S. Fabbro; A. S. Fruchter; A. Goobar; I. Hook; M. Irwin; M. Kim; R. A. Knop; C. Lidman; R. McMahon; P. E. Nugent; R. Pain; N. Panagia; C. R. Pennypacker; S. Perlmutter; P. Ruiz-Lapuente; B. Schaefer; N. A. Walton; T. York

doi:10.1086/322460

Timescale Stretch Parameterization of Type Ia Supernova B-Band Light Curves

G. Goldhaber, D. E. Groom, A. Kim, G. Aldering, P. Astier, A. Conley, S. E. Deustua, R. Ellis, S. Fabbro, A. S. Fruchter, A. Goobar, I. Hook, M. Irwin, M. Kim, R. A. Knop, C. Lidman, R. McMahon, P. E. Nugent, R. Pain, N. PanagiaC. R. Pennypacker, S. Perlmutter, P. Ruiz-Lapuente, B. Schaefer, N. A. Walton, T. York

Research School of Astronomy & Astrophysics

Research output: Contribution to journal › Article › peer-review

258 Citations (Scopus)

Abstract

R-band intensity measurements along the light curve of Type Ia supernovae (SNe Ia) discovered by the Supernova Cosmology Project (SCP) are fitted in brightness to templates allowing a free parameter the time-axis width factor w≡s(1+z). The data points are then individually aligned in the time axis, normalized, and K-corrected back to the rest frame, after which the nearly 1300 normalized intensity measurements are found to lie on a well-determined common rest-frame B-band curve, which we call the ``composite curve.'' The same procedure is applied to 18 low-redshift Calán/Tololo SNe with z2/dof~1-thus, as well as any parameterization can, given the current data sets. The measurement of the date of explosion, however, is model dependent and not tightly constrained by the current data. We also demonstrate the 1+z light-curve time-axis broadening expected from cosmological expansion. This argues strongly against alternative explanations, such as tired light, for the redshift of distant objects.

Original language	English
Pages (from-to)	359-368
Number of pages	10
Journal	Astrophysical Journal
Volume	558
DOIs	https://doi.org/10.1086/322460
Publication status	Published - 1 Sept 2001

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https://ui.adsabs.harvard.edu/abs/2001ApJ...558..359G

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Goldhaber, G., Groom, D. E., Kim, A., Aldering, G., Astier, P., Conley, A., Deustua, S. E., Ellis, R., Fabbro, S., Fruchter, A. S., Goobar, A., Hook, I., Irwin, M., Kim, M., Knop, R. A., Lidman, C., McMahon, R., Nugent, P. E., Pain, R., ... York, T. (2001). Timescale Stretch Parameterization of Type Ia Supernova B-Band Light Curves. Astrophysical Journal, 558, 359-368. https://doi.org/10.1086/322460

@article{430ba929b16a431e9f9268ff08ae74b2,

title = "Timescale Stretch Parameterization of Type Ia Supernova B-Band Light Curves",

abstract = "R-band intensity measurements along the light curve of Type Ia supernovae (SNe Ia) discovered by the Supernova Cosmology Project (SCP) are fitted in brightness to templates allowing a free parameter the time-axis width factor w≡s(1+z). The data points are then individually aligned in the time axis, normalized, and K-corrected back to the rest frame, after which the nearly 1300 normalized intensity measurements are found to lie on a well-determined common rest-frame B-band curve, which we call the ``composite curve.'' The same procedure is applied to 18 low-redshift Cal{\'a}n/Tololo SNe with z2/dof~1-thus, as well as any parameterization can, given the current data sets. The measurement of the date of explosion, however, is model dependent and not tightly constrained by the current data. We also demonstrate the 1+z light-curve time-axis broadening expected from cosmological expansion. This argues strongly against alternative explanations, such as tired light, for the redshift of distant objects.",

keywords = "Cosmology: Cosmological Parameters, Galaxies: High-Redshift, Stars: Supernovae: General, Astrophysics",

author = "G. Goldhaber and Groom, {D. E.} and A. Kim and G. Aldering and P. Astier and A. Conley and Deustua, {S. E.} and R. Ellis and S. Fabbro and Fruchter, {A. S.} and A. Goobar and I. Hook and M. Irwin and M. Kim and Knop, {R. A.} and C. Lidman and R. McMahon and Nugent, {P. E.} and R. Pain and N. Panagia and Pennypacker, {C. R.} and S. Perlmutter and P. Ruiz-Lapuente and B. Schaefer and Walton, {N. A.} and T. York",

year = "2001",

month = sep,

day = "1",

doi = "10.1086/322460",

language = "English",

volume = "558",

pages = "359--368",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

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Goldhaber, G, Groom, DE, Kim, A, Aldering, G, Astier, P, Conley, A, Deustua, SE, Ellis, R, Fabbro, S, Fruchter, AS, Goobar, A, Hook, I, Irwin, M, Kim, M, Knop, RA, Lidman, C, McMahon, R, Nugent, PE, Pain, R, Panagia, N, Pennypacker, CR, Perlmutter, S, Ruiz-Lapuente, P, Schaefer, B, Walton, NA & York, T 2001, 'Timescale Stretch Parameterization of Type Ia Supernova B-Band Light Curves', Astrophysical Journal, vol. 558, pp. 359-368. https://doi.org/10.1086/322460

TY - JOUR

T1 - Timescale Stretch Parameterization of Type Ia Supernova B-Band Light Curves

AU - Goldhaber, G.

AU - Groom, D. E.

AU - Kim, A.

AU - Aldering, G.

AU - Astier, P.

AU - Conley, A.

AU - Deustua, S. E.

AU - Ellis, R.

AU - Fabbro, S.

AU - Fruchter, A. S.

AU - Goobar, A.

AU - Hook, I.

AU - Irwin, M.

AU - Kim, M.

AU - Knop, R. A.

AU - Lidman, C.

AU - McMahon, R.

AU - Nugent, P. E.

AU - Pain, R.

AU - Panagia, N.

AU - Pennypacker, C. R.

AU - Perlmutter, S.

AU - Ruiz-Lapuente, P.

AU - Schaefer, B.

AU - Walton, N. A.

AU - York, T.

PY - 2001/9/1

Y1 - 2001/9/1

N2 - R-band intensity measurements along the light curve of Type Ia supernovae (SNe Ia) discovered by the Supernova Cosmology Project (SCP) are fitted in brightness to templates allowing a free parameter the time-axis width factor w≡s(1+z). The data points are then individually aligned in the time axis, normalized, and K-corrected back to the rest frame, after which the nearly 1300 normalized intensity measurements are found to lie on a well-determined common rest-frame B-band curve, which we call the ``composite curve.'' The same procedure is applied to 18 low-redshift Calán/Tololo SNe with z2/dof~1-thus, as well as any parameterization can, given the current data sets. The measurement of the date of explosion, however, is model dependent and not tightly constrained by the current data. We also demonstrate the 1+z light-curve time-axis broadening expected from cosmological expansion. This argues strongly against alternative explanations, such as tired light, for the redshift of distant objects.

AB - R-band intensity measurements along the light curve of Type Ia supernovae (SNe Ia) discovered by the Supernova Cosmology Project (SCP) are fitted in brightness to templates allowing a free parameter the time-axis width factor w≡s(1+z). The data points are then individually aligned in the time axis, normalized, and K-corrected back to the rest frame, after which the nearly 1300 normalized intensity measurements are found to lie on a well-determined common rest-frame B-band curve, which we call the ``composite curve.'' The same procedure is applied to 18 low-redshift Calán/Tololo SNe with z2/dof~1-thus, as well as any parameterization can, given the current data sets. The measurement of the date of explosion, however, is model dependent and not tightly constrained by the current data. We also demonstrate the 1+z light-curve time-axis broadening expected from cosmological expansion. This argues strongly against alternative explanations, such as tired light, for the redshift of distant objects.

KW - Cosmology: Cosmological Parameters

KW - Galaxies: High-Redshift

KW - Stars: Supernovae: General

KW - Astrophysics

U2 - 10.1086/322460

DO - 10.1086/322460

M3 - Article

SN - 0004-637X

VL - 558

SP - 359

EP - 368

JO - Astrophysical Journal

JF - Astrophysical Journal

ER -

Timescale Stretch Parameterization of Type Ia Supernova B-Band Light Curves

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