TY - JOUR
T1 - Effects of a new triple-α reaction rate on the helium ignition of accreting white dwarfs
AU - Saruwatari, Motoaki
AU - Hashimoto, Masa Aki
N1 - Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2010/11
Y1 - 2010/11
N2 - The effects of a new triple-α reaction rate on the ignition of carbon-oxygen white dwarfs accreting helium in a binary system have been investigated. The ignition points determine the properties of a thermonuclear explosion of a Type Ia supernova. We examine the cases of different accretion rates of helium and different initial masses of the white dwarf, which was studied in detail by Nomoto [K. Nomoto, Astrophys. J. 253 (1982), 798]. We find that for all cases from slow to intermediate accretion rates, nuclear burnings are ignited at the helium layers. As a consequence, carbon deflagration would be triggered for lower accretion rate than dM/dt ≃ 4 × 10-8 M⊙ yr-1 which has been believed to be the lower limit of the accretion rate for the deflagration supernova. Furthermore, off-center helium detonation should result for intermediate and slow accretion rates, and the region of carbon deflagration for slow accretion rates disappears.
AB - The effects of a new triple-α reaction rate on the ignition of carbon-oxygen white dwarfs accreting helium in a binary system have been investigated. The ignition points determine the properties of a thermonuclear explosion of a Type Ia supernova. We examine the cases of different accretion rates of helium and different initial masses of the white dwarf, which was studied in detail by Nomoto [K. Nomoto, Astrophys. J. 253 (1982), 798]. We find that for all cases from slow to intermediate accretion rates, nuclear burnings are ignited at the helium layers. As a consequence, carbon deflagration would be triggered for lower accretion rate than dM/dt ≃ 4 × 10-8 M⊙ yr-1 which has been believed to be the lower limit of the accretion rate for the deflagration supernova. Furthermore, off-center helium detonation should result for intermediate and slow accretion rates, and the region of carbon deflagration for slow accretion rates disappears.
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U2 - 10.1143/PTP.124.925
DO - 10.1143/PTP.124.925
M3 - Article
AN - SCOPUS:79251495770
VL - 124
SP - 925
EP - 929
JO - Progress of Theoretical Physics
JF - Progress of Theoretical Physics
SN - 0033-068X
IS - 5
ER -