The Observational Signatures of Accretion Induced Collapse

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

A white dwarf approaching the Chandrasekhar mass may in several circumstances undergo accretion-induced collapse (AIC) to a neutron star before a thermonuclear explosion ensues. It has generally been assumed that an AIC does not produce a detectable supernova. If, however, the progenitor white dwarf is rapidly rotating, a centrifugally supported disc forms around the neutron upon collapse. We summarize the properties of such a disk and show that nickel production in the disk's winds may create an observable optical transient that is in fact brighter than the neutron star creation itself. We also discuss the X-ray flash that is produced when the shock from core-bounce breaks out of the white dwarf envelope.

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