A Universal B-band Lightcurve for Type IA Supernovae and Direct Evidence for the Expansion of the Universe

Details A Universal B-band Lightcurve for Type IA Supernovae and Direct Evidence for the Expansion of the Universe A Universal B-band Lightcurve for Type IA Supernovae and Direct Evidence for the Expansion of the Universe

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.4713g&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #47.13; Bulletin of the American Astronomical Society, Vol. 30, p.1325

Mathematics

Logic

19

Scientific paper

Intensity measurements for each of 36 high-redshift supernovae, a fully analyzed subset of the 75 discovered by the Supernova Cosmology Project, have been fitted using a standard B-band Leibundgut template with an adjustable time of maximum light, amplitude, and a horizontal (time) axis scale expansion factor s(1+z). Here the redshift z has been determined spectroscopically, and the ``stretch factor'' s, except for a few outliers is within 15% of unity. Appropriate K-corrections from the R-band to the B-band have been made. When this is done and individual lightcurves are normalized to unit maximum brightness, the more than 1400 experimental points are found to lie on a common curve. It is also found that the supernovae, whose light curves act as clocks at cosmological distances, cannot be combined if the Doppler factor 1+z is omitted. This clear evidence for the ``time dilation" of distant supernovae, as expected from cosmological expansion, argues strongly against alternative explanations for the redshift.

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