Detection of Two-armed Spiral Shocks on the Accretion Disk of the Eclipsing Fast Nova V1494 Aquilae

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Abstract
We have modeled the unusual orbital light curve of V1494 Aquilae (Nova Aquilae 1999 No. 2) and found that such an unusual orbital light curve can be reproduced when there exist two-armed spiral shocks on the accretion disk. V1494 Aql is a fast classical nova and is found to be an eclipsing system with an orbital period of 0.1346138 days in the late phase of the nova outburst. Its orbital light curve shows a small bump at orbital phase 0.2, a small dip at 0.3, sometimes a small bump at 0.4, and a large bump at 0.6-0.7 outside eclipse. Such a double- or triple-wave pattern outside eclipse has never been observed, even though the overall patterns look like some supersoft X-ray sources or eclipsing polars. We have calculated orbital light curves, including the irradiation effects of the accretion disk and the companion by the hot white dwarf. These unusual patterns can be reproduced when we assume two-armed spiral shocks on the accretion disk. In particular, triple-wave patterns are naturally obtained. This result strongly suggests the existence of two-armed spiral shocks on the accretion disk in the late phase of the nova outburst.
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