Detection of two-armed spiral shocks on the accretion disk of the eclipsing fast nova V1494 Aquilae

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 found to be an eclipsing system with the 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 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. Especially, 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.

7 pages, 3 figurs, to appear in ApJL

References in corpus (10)

• Recurrent novae as a progenitor system of Type Ia supernovae. I. RS Ophiuchi subclass --- Systems with a red giant companion
• A Theoretical Light-Curve Model for the 1999 Outburst of U Scorpii
• RX J0513.9-6951: The first example of accretion wind evolution, a key evolutionary process to Type Ia supernovae
• Two and Three Dimensional Numerical Simulations of Accretion Discs in a Close Binary System
• A limit cycle model for long-term optical variations of V Sagittae: The second example of accretion wind evolution
• A new clue to the transition mechanism between optical high and low states of the supersoft X-ray source RX J0513.9-6951, implied from the recurrent nova CI Aquilae 2000 outburst model
• Revised analysis of the supersoft X-ray phase, helium enrichment, and turn-off time in the 2000 outburst of recurrent nova CI Aquilae
• Prediction of supersoft X-ray phase, helium enrichment, and turn-off time in recurrent nova CI Aquilae 2000 outburst
• V1494 Aql: Eclipsing Fast Nova with an Unusual Orbital Light Curve
• On the close optical companion of V1494 Aql: problems with light curve modelling

Cited by in corpus (10)

• Obscuration effects in Super-Soft-Source X-ray spectra
• The accretion disk in the post period-minimum cataclysmic variable SDSS J080434.20+510349.2
• Dark spot, Spiral waves and the SW Sex behaviour: it is all about UX Ursae Majoris
• Elemental Abundances in the Ejecta of Old Classical Novae from Late-Epoch Spitzer Spectra
• The nature of premaximum halts of classical nova outbursts: V723 Cassiopeiae and V463 Scuti
• Photometric Observation and Numerical Simulation of Early Superhumps in BC UMa during the 2003 Superoutburst
• The orbital period of Nova V2540 Ophiuchi (2002)
• The Detection of a 3.5-h Period in the Classical Nova Velorum 1999 (V382 Vel) and the Long Term Behavior of the Nova Light Curve
• Spectroscopically Confirmed Large-Scale Structures Associated to a z=0.83 Cluster
• Constraining jet theories using nova outbursts