Photometric Studies of a WZ Sge-Type Dwarf Nova Candidate, ASAS 160048 $-$ 4846.2

• Published in: Publications of the Astronomical Society of Japan Vol. 61; no. 2; pp. 395 - 401
• Main Authors: Soejima, Yuichi, Imada, Akira, Nogami, Daisaku, Kato, Taichi, Monard, Berto
• Format: Journal Article
• Language: English
• Published: Oxford, UK Oxford University Press 25.04.2009
• Subjects: stars: dwarf novae; stars: oscillations; accretion, accretion disks; stars: individual (ASAS 160048-4846.2); novae, cataclysmic variables
• ISSN: 0004-6264; 2053-051X
• DOI: 10.1093/pasj/61.2.395

We report on our time-resolved CCD photometry during the 2005 June superoutburst of a WZ Sge-type dwarf nova candidate, ASAS 160048 $-$ 4846.2. The ordinary superhumps of the object underwent a complex evolution during the superoutburst. The superhump amplitude experienced a regrowth and had two peaks. The superhump period decreased when the superhump amplitude reached the first maximum, subsequently increased gradually until the second maximum of the amplitude, and finally decreased again. Investigating other SU UMa-type dwarf novae, which show an increase in superhump period, we found the same trend of the superhump evolution in superoutbursts of them. We speculate that the superhump regrowth in the amplitude has a direct relation to the increase in superhump period, and all SU UMa-type dwarf novae with a superhump regrowth follow the same evolution of the ordinary superhumps as that of ASAS 160048 $-$ 4846.2.