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Title:
Timescale Stretch Parameterization of Type Ia Supernova B-Band Light Curves
Authors:
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.; Panagia, N.; Pennypacker, C. R.; Perlmutter, S.; Ruiz-Lapuente, P.; Schaefer, B.; Walton, N. A.; York, T.
Affiliation:
AA(; .; E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720.; Center for Particle Astrophysics, University of California, Berkeley, CA 94720.), AB(; E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720.), AC(; E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720.), AD(; E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720.), AE(; Laboratoire de Physique Nucléaire des Hautes Énergies, CNRS-IN2P3, University of Paris VI & VII, Paris, France.), AF(; E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720.), AG(; E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720.), AH(; Institute of Astronomy, Cambridge University, Madingley Road, Cambridge CB3 0HA, UK.; Current address: California Institute of Technology, Pasadena, California.), AI(; Laboratoire de Physique Nucléaire des Hautes Énergies, CNRS-IN2P3, University of Paris VI & VII, Paris, France.), AJ(; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AK(; Fysikum, University of Stockholm, S-11385 Stockholm, Sweden.), AL(; Institute for Astronomy, The University of Edinburgh, Edinburgh EH9 3HJ, Scotland.), AM(; Institute of Astronomy, Cambridge University, Madingley Road, Cambridge CB3 0HA, UK.), AN(; E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720.), AO(; E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720.), AP(; European Southern Observatory, La Silla Observatory, Av. El Santo 1538, La Serena, Chile.), AQ(; Institute of Astronomy, Cambridge University, Madingley Road, Cambridge CB3 0HA, UK.), AR(; E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720.), AS(; Laboratoire de Physique Nucléaire des Hautes Énergies, CNRS-IN2P3, University of Paris VI & VII, Paris, France.), AT(; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AU(; E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720.; Also Space Sciences Laboratory, MC 7450, University of California, Berkeley, CA 94720.), AV(; E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720.; Center for Particle Astrophysics, University of California, Berkeley, CA 94720.), AW((THE SUPERNOVA COSMOLOGY PROJECT); Department of Astronomy, University of Barcelona, Av. Diagonal, 647, E-08028 Barcelona, Spain.), AX((THE SUPERNOVA COSMOLOGY PROJECT); Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101.; Current address: University of Texas, Austin, TX.), AY((THE SUPERNOVA COSMOLOGY PROJECT); Isaac Newton Group, La Palma, Spain.), AZ((THE SUPERNOVA COSMOLOGY PROJECT))
Publication:
The Astrophysical Journal, Volume 558, Issue 1, pp. 359-368. (ApJ Homepage)
Publication Date:
09/2001
Origin:
UCP
ApJ Keywords:
Cosmology: Cosmological Parameters, Galaxies: High-Redshift, Stars: Supernovae: General
DOI:
10.1086/322460
Bibliographic Code:
2001ApJ...558..359G

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 z<0.11 these nearly 300 B-band photometry points are found to lie on the composite curve equally well. The SCP search technique produces several measurements before maximum light for each supernova. We demonstrate that the linear stretch factor, s, which parameterizes the light-curve timescale, appears independent of z, and applies equally well to the declining and rising parts of the light curve. In fact, the B-band template that best fits this composite curve fits the individual supernova photometry data when stretched by a factor s with χ2/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.
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