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Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. V: The Fifth Year (2012-2013)

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arxiv 1310.7069 v1 pith:B7ZHPSFC submitted 2013-10-26 astro-ph.SR

Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. V: The Fifth Year (2012-2013)

Taichi Kato , Franz-Josef Hambsch , Hiroyuki Maehara , Gianluca Masi , Francesca Nocentini , Pavol A. Dubovsky , Igor Kudzej , Kazuyoshi Imamura
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Minako Ogi Kenji Tanabe Hidehiko Akazawa Thomas Krajci Ian Miller Enrique de Miguel Arne Henden Colin Littlefield Ryo Noguchi Takehiro Ishibashi Rikako Ono Miho Kawabata Hiroshi Kobayashi Daisuke Sakai Hirochika Nishino Hisami Furukawa Kazunari Masumoto Katsura Matsumoto Tomohito Ohshima Chikako Nakata Satoshi Honda Kenzo Kinugasa Osamu Hashimoto William Stein Roger D. Pickard Seiichiro Kiyota Elena P. Pavlenko Oksana I. Antonyuk Aleksei V. Baklanov Kirill Antonyuk Denis Samsonov Nikolaj Pit Aleksei Sosnovskij Arto Oksanen Caisey Harlingten Jenni Tyyska Berto Monard Sergey Yu. Shugarov Drahomir Chochol Kiyoshi Kasai Yutaka Maeda Kenji Hirosawa Hiroshi Itoh Richard Sabo Joseph Ulowetz Etienne Morelle Raul Michel Genaro Suarez Nick James Shawn Dvorak Irina B. Voloshina Michael Richmond Bart Staels David Boyd Maksim V. Andreev Nikolai Parakhin Natalia Katysheva Atsushi Miyashita Kazuhiro Nakajima Greg Bolt Stefano Padovan Peter Nelson Donn R. Starkey Denis Buczynski Peter Starr William N. Goff Denis Denisenko Christopher S. Kochanek Benjamin Shappee Krzysztof Z. Stanek Jose L. Prieto Koh-ichi Itagaki Shizuo Kaneko Rod Stubbings Eddy Muyllaert Jeremy Shears Patrick Schmeer Gary Poyner Miguel Rodriguez Marco
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Continuing the project described by Kato et al. (2009a, arXiv:0905.1757), we collected times of superhump maxima for SU UMa-type dwarf novae mainly observed during the 2012-2013 season. We found three objects (V444 Peg, CSS J203937 and MASTER J212624) having strongly positive period derivatives despite the long orbital period (Porb). By using the period of growing stage (stage A) superhumps, we obtained mass ratios for six objects. We characterized nine new WZ Sge-type dwarf novae. We made a pilot survey of the decline rate of slowly fading part of SU UMa-type and WZ Sge-type outbursts. The decline time scale was found to generally follow the expected Porb^(1/4) dependence and WZ Sge-type outbursts also generally follow this trend. There are some objects which show slower decline rates, and we consider these objects good candidates for period bouncers. We also studied unusual behavior in some objects, including BK Lyn which made a transition from an ER UMa-type state to the novalike (standstill) state in 2013 and unusually frequent occurrence of superoutbursts in NY Ser and CR Boo. We applied least absolute shrinkage and selection operator (Lasso) power spectral analysis, which has been proven to be very effective in analyzing the Kepler data, to ground-based photometry of BK Lyn and detected the dramatic disappearance of the signal of negative superhumps in 2013. We suggested that the mass-transfer rates did not vary strongly between the ER UMa-type state and novalike state in BK Lyn, and this transition was less likely caused by a systematic variation of the mass-transfer rate.

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