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A New Progenitor Model of Type Ia Supernovae

Published online by Cambridge University Press:  14 August 2015

Izumi Hachisu ,
Mariko Kato  and
Hideyuki Saio
Izumi Hachisu
Affiliation:
Department of Aeronautical Engineering, Kyoto UniversityKyoto 606, Japan
Mariko Kato
Affiliation:
Department of Astronomy, Keio University, Yokohama 223, Japan
Hideyuki Saio
Affiliation:
Department of Astronomy, University of Tokyo, Tokyo 113, Japan

Abstract

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A new progenitor model of Type la supernovae (SNe Ia) is proposed. The model consists of a carbon-oxygen white dwarf (0.8-1.2 M⊙) and a low-mass red giant star (0.8-1.5 M⊙) with a helium core (0.2-0.4 M⊙). When a red giant fills its inner critical Roche lobe and its mass transfer rate exceeds a critical value, a common envelope state is realized. Then the mass accretion rate onto the white dwarf, i.e., the mass transfer rate is tuned up to be Ṁ= 8.5 × 10−7 (MWD/M⊙-0.52) M⊙ yr−1, where MWD is the mass of the white dwarf. This rate is high enough to suppress the hydrogen shell flashes, but too low for carbon to be ignited off-center. When the carbon-oxygen core mass grows to the Chandrasekhar limit during the common envelope phase, a Type la supernova explosion is expected to occur.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 8: Highlights of Astronomy. As presented at the XXth General Assembly of the IAU, 1988 , 1989 , pp. 175 - 176
Copyright
Copyright © Kluwer 1989

References

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