Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. II: The Second Year (2009-2010)
Taichi Kato, Hiroyuki Maehara, Makoto Uemura, Arne Henden, Enrique de, Miguel, Ian Miller, Pavol A. Dubovsky, Igor Kudzej, Seiichiro Kiyota,, Franz-Josef Hambsch, Kenji Tanabe, Kazuyoshi Imamura, Nanae Kunitomi, Ryosuke, Takagi, Mikiha Nose, Hidehiko Akazawa, Gianluca Masi

TL;DR
This survey analyzes superhump period variations in SU UMa-type dwarf novae over two years, confirming known stages, identifying new objects, and proposing models for period changes and rebrightening behaviors.
Contribution
It extends previous work by providing two years of new data, confirming superhump stages, discovering new WZ Sge-type systems, and introducing Bayesian methods for period analysis.
Findings
Confirmed superhump stages A-C and positive period derivatives.
Discovered three new WZ Sge-type dwarf novae with early superhumps.
Suggested a link between beat phenomena and superhump period variations.
Abstract
As an extension of the project in Kato et al. (2009, arXiv:0905.1757), we collected times of superhump maxima for 61 SU UMa-type dwarf novae mainly observed during the 2009-2010 season. The newly obtained data confirmed the basic findings reported in Kato et al. (2009): the presence of stages A-C, as well as the predominance of positive period derivatives during stage B in systems with superhump periods shorter than 0.07 d. There was a systematic difference in period derivatives for systems with superhump periods longer than 0.075 d between this study and Kato et al. (2009). We suggest that this difference is possibly caused by the relative lack of frequently outbursting SU UMa-type dwarf novae in this period regime in the present study. We recorded a strong beat phenomenon during the 2009 superoutburst of IY UMa. The close correlation between the beat period and superhump period…
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