Time Dilation in the Light Curve of the Distant Type Ia Supernovae SN 1995K

Details Time Dilation in the Light Curve of the Distant Type Ia Supernovae SN 1995K Time Dilation in the Light Curve of the Distant Type Ia Supernovae SN 1995K

1996-05-22

arxiv.org/abs/astro-ph/9605134v1

Astrophys.J. 466 (1996) L21

Astronomy and Astrophysics

Astrophysics

5 pages, 2 PostScript figures, accepted for publication in the Astrophysical Journal Letters, PostScript version (including fi

Scientific paper

10.1086/310164

The light curve of a distant Type Ia supernova acts like a clock that can be used to test the expansion of the Universe. SN~1995K, at a spectroscopic redshift of $z = 0.479$, provides one of the first meaningful data sets for this test. We find that all aspects of SN~1995K resemble local supernova Ia events when the light curve is dilated by $(1+z)$, as prescribed by cosmological expansion. In a static, non-expanding universe SN~1995K would represent a unique object with a spectrum identifying it as a regular Type Ia supernova but a light curve shape and luminosity which do not follow the well-established relations for local events. We conclude that SN~1995K provides strong evidence for an interpretation of cosmological redshifts as due to universal expansion. Theories in which photons dissipate their energy during travel are excluded as are age-redshift dependencies.

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