Discovery of superhumps during a normal outburst of SU Ursae Majoris

Abstract

We report on time-resolved photometry during a 2012 January normaloutburst of SU UMa. The light curve shows hump-like modulations with a period of 0.07903(11) d, which coincides with the known superhump period of SU UMa during superoutbursts. We interpret this as superhump, based on the observed periodicity, profiles of the averaged light curve, and the $g^{\prime }-I_{\mathrm{c}}$ variation during the normal outburst. This is the first case that superhumps are detected during an isolated normal outburst of SU UMa-type dwarf novae. The present result strongly suggests that the radius of the accretion disk already reaches the 3:1 resonance even in the midst of the supercycle.

4 pages, 4 figure, PASJ letter in press

References in corpus (2)

• The Kepler light curves of V1504 Cygni and V344 Lyrae: A study of the Outburst Properties
• Discovery of Negative Superhumps during a Superoutburst of January 2011 in ER Ursae Majoris

Cited by in corpus (6)

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• TACOS: TESS AM~CVn Outbursts Survey
• Optical Dual-Band Photometry and Spectroscopy of the WZ Sge-Type Dwarf Nova EZ Lyn during the 2010 Superoutburst
• Searching for cataclysmic variable stars in unidentified X-ray sources
• OAO/MITSuME Photometry of Dwarf Novae: I SU Ursae Majoris
• Photometric analysis of the dwarf nova SU UMa based on TESS