Hubble's constant and exploding carbon-oxygen white dwarf models for Type I supernovae

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Carbon Stars, Gravitational Collapse, Hubble Constant, Stellar Models, Supernovae, White Dwarf Stars, Binary Stars, Chandrasekhar Equation, Nickel Isotopes, Oxygen, Stellar Evolution, Stellar Luminosity, Stellar Mass Accretion

Scientific paper

The immediate progenitor of a Type I supernova (SN I) is thought to be a mass-accreting carbon-oxygen (C-O) white dwarf in a binary system. In the supernova explosion the C-O fuel is partly incinerated to radioactive 56Ni. The optical luminosity results from the trapping and thermalization of the γ rays and positrons emitted by the decay of 56Ni through 56Co to 56Fe. The authors estimate the amount of 56Ni synthesized and the corresponding peak luminosity of a SN I from the model. This estimate is combined with the observed Hubble diagram of SN I to derive the value of the Hubble constant H0. It is found that H0 is in the range 39 - 73 km s-1Mpc-1 with a best estimate of 59 km s-1Mpc-1.

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