Off-Center Carbon Ignition in Rapidly Rotating, Accreting Carbon-Oxygen White Dwarfs

Abstract

We study the effect of stellar rotation on the carbon ignition in a carbon-oxygen white dwarf accreting CO-rich matter. Including the effect of the centrifugal force of rotation, we have calculated evolutionary models up to the carbon ignition for various accretion rates. The rotation velocity at the stellar surface is set to be the Keplerian velocity. The angular velocity in the stellar interior has been determined by taking into account the transport of angular momentum due to turbulent viscosity. We have found that an off-center carbon ignition occurs even when the effect of stellar rotation is included if the accretion rate is sufficiently high; the critical accretion rate for the off-center ignition is hardly changed by the effect of rotation. Rotation, however, delays the ignition;i.e., the mass coordinate of the ignition layer and the total mass at the ignition are larger than those for the corresponding no-rotating model. The result supports our previous conclusion that a double-white dwarf merger would not be a progenitor of a SN Ia.

18 pages, 6 figures; To appear in the Astrophysical Journal, 1 November 2004, V615 issue

References in corpus (4)

• Presupernova evolution of accreting white dwarfs with rotation
• Dynamical bar-mode instability of differentially rotating stars: Effects of equations of state and velocity profiles
• Carbon-Oxygen White Dwarfs Accreting CO-Rich Matter I: A Comparison Between Rotating and Non-Rotating Models
• Evolution of Rotating Accreting White Dwarfs and the Diversity of Type Ia Supernovae

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