Using Type IA Supernova Light Curve Shapes to Measure the Hubble Constant
Abstract
We present an empirical method that uses visual band light curve shapes (LCSs) to estimate the luminosity of Type Ia supernova (SN Ia's). This method is first applied to a "training set" of eight SN Ia light curves with independent distance estimates to derive the correlation between the LCS and the luminosity. We employ a linear estimation algorithm of the type developed by Rybicki and Press. The result is similar to that obtained by Hamuy et al. with the advantage that LCS produces quantitative error estimates for the distance. We then examine the light curves for 13 SN Ia's to determine the LCS distances of these supernovae. The Hubble diagram constructed using these LCS distances has a remarkably small dispersion of σ_v_ = 0.21 mag. We use the light curve of SN 1972E and the Cepheid distance to NGC 5253 to derive 67 +/ 7 km s^1^ Mpc^1^ for the Hubble constant.
 Publication:

The Astrophysical Journal
 Pub Date:
 January 1995
 DOI:
 10.1086/187704
 arXiv:
 arXiv:astroph/9410054
 Bibcode:
 1995ApJ...438L..17R
 Keywords:

 Astronomical Models;
 Cosmology;
 Distance;
 Hubble Constant;
 Light Curve;
 Mathematical Models;
 Stellar Luminosity;
 Supernovae;
 Algorithms;
 Error Analysis;
 Statistical Analysis;
 Statistical Tests;
 Visible Spectrum;
 Astrophysics;
 COSMOLOGY: DISTANCE SCALE;
 STARS: SUPERNOVAE: GENERAL;
 Astrophysics
 EPrint:
 10 pages + 2 figures, Postscript file includes text and figures, Submitted to Ap.J. (Letters), HarvardSmithsonian Center for Astrophysics Preprint 4999