The Recurrent Nova U Scorpii - A Type Ia Supernova Progenitor
T. D. Thoroughgood, V. S. Dhillon, S. P. Littlefair, T. R. Marsh, D. A. Smith
Abstract
We derive the mass of the white dwarf in the eclipsing recurrent nova U Sco from the radial velocity semi-amplitudes of the primary and secondary stars. Our results give a high white dwarf mass of M1 = 1.55 0.24M, consistent with the thermonuclear runaway model of recurrent nova outbursts. We confirm that U Sco is the best Type Ia supernova progenitor known, and predict that the time to explosion is within ~700,000 years.
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