Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. VI: The Sixth Year (2013-2014)
| Autor: | Enrique de Miguel, Minami Matsuura, William Stein, Sahori Mizoguchi, Pavol A. Dubovsky, Aleksandr Sklyanov, Kazuhiko Shiokawa, Igor Kudzej, Katsura Matsumoto, Eddy Muyllaert, Christopher S. Kochanek, Etienne Morelle, Nikolai Parakhin, Tomohito Ohshima, Sergey Yu. Shugarov, Rod Stubbings, Oksana I. Antonyuk, B. Debski, Koh-ichi Itagaki, Benjamin J. Shappee, Francesca Nocentini, Patrick Schmeer, Kazunari Masumoto, Daiki Fukushima, Irina Voloshina, Kiyoshi Kasai, Ryo Noguchi, Maksim V. Andreev, Gianluca Masi, Shinichi Nakagawa, Hirochika Nishino, Hidetoshi Iwamatsu, Joseph Ulowetz, Javier Ruiz, Jose Ripero, Caisey Harlingten, Gary Poyner, Vitaly Neustroev, M. Curyło, Arne Henden, D. Denisenko, Arto Oksanen, Tat'yana R. Irsmambetova, Marcin Klimaszewski, George Sjoberg, Kazuyoshi Imamura, Colin Littlefield, Richard Sabo, Berto Monard, Elena P. Pavlenko, Vladimir Metlov, Masayuki Yamanaka, Kirill A. Antonyuk, Raul Michel, Jose L. Prieto, Aleksei V. Baklanov, Kenji Hirosawa, Natalia Katysheva, Eriko Iino, Hiroshi Itoh, Rudolf Novak, Yutaka Maeda, Drahomir Chochol, Krzysztof Z. Stanek, Chikako Nakata, Daisuke Sakai, Paulina Sowicka, Franz-Josef Hambsch, Seiichiro Kiyota, Greg Bolt, Neil Butterworth, William N. Goff, Michael Richmond, Yoshiharu Ito, Hiroyuki Maehara, Hidehiko Akazawa, Nikolaj V. Pit, Peter Nelson, Shawn Dvorak, Genki Bouno, Megumi Takenaka, Roger D. Pickard, Ian Miller, Miho Kawabata, Ivan A. Curtis, Taichi Kato |
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| Rok vydání: | 2014 |
| Předmět: | |
| DOI: | 10.48550/arxiv.1406.6428 |
| Popis: | Continuing the project described by Kato et al. (2009, PASJ, 61, S395, arXiv:0905.1757), we collected times of superhump maxima for 56 SU UMa-type dwarf novae mainly observed during the 2013-2014 season and characterized these objects. We detected negative superhumps in VW Hyi and indicated that the low number of normal outbursts in some supercycle can be interpreted as a result of the disk tilt. This finding, combined with the Kepler observation of V1504 Cyg and V344 Lyr, suggests that the disk tilt is responsible for modulating the outburst pattern in SU UMa-type dwarf novae. We also studied the deeply eclipsing WZ Sge-type dwarf nova MASTER OT J005740.99+443101.5 and found evidence of a sharp eclipse during the phase of early superhumps. The profile can be reproduced by a combination of the eclipse of the axisymmetric disk and the uneclipsed light source of early superhumps. This finding confirms the lack of evince of a greatly enhanced hot spot during the early stage of WZ Sge-type outburst. We detected growing (stage A) superhumps in MN Dra and give a suggestion that some of SU UMa-type dwarf novae situated near the critical condition of tidal instability may show long-lasting stage A superhumps. The large negative period derivatives reported in such systems can be understood a result of the combination of stage A and B superhumps. The WZ Sge-type dwarf novae AL Com and ASASSN-13ck showed a long-lasting (plateau-type) rebrightening. In the early phase of the rebrightening, both objects showed a precursor-like outburst, suggesting that the long-lasting rebrightening is triggered by a precursor outburst. Comment: 73 pages, 88 figures, accepted for publication in PASJ |
| Databáze: | OpenAIRE |
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