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Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. IX: The Ninth Year (2016-2017)

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arxiv 1706.03870 v2 pith:THRXPB3F submitted 2017-06-12 astro-ph.SR

Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. IX: The Ninth Year (2016-2017)

Taichi Kato , Keisuke Isogai (Kyoto U) , Franz-Josef Hambsch , Tonny Vanmunster , Hiroshi Itoh , Berto Monard , Tamaas Tordai , Mariko Kimura
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Yasuyuki Wakamatsu Seiichiro Kiyota Ian Miller Peter Starr Kiyoshi Kasai Sergey Yu. Shugarov Drahomir Chochol Natalia Katysheva Anna M. Zaostrojnykh Matej Sekeras Yuliana G. Kuznyetsova Eugenia S. Kalinicheva Polina Golysheva Viktoriia Krushevska Yutaka Maeda Pavol A. Dubovsky Igor Kudzej Elena P. Pavlenko Kirill A. Antonyuk Nikolaj V. Pit Aleksei A. Sosnovskij Oksana I. Antonyuk Aleksei V. Baklanov Roger D. Pickard Naoto Kojiguchi Yuki Sugiura Shihei Tei Kenta Yamamura Katsura Matsumoto Javier Ruiz Geoff Stone Lewis M. Cook Enrique de Miguel Hidehiko Akazawa William N. Goff Etienne Morelle Stella Kafka Colin Littlefield Greg Bolt Franky Dubois Stephen M. Brincat Hiroyuki Maehara Takeshi Sakanoi Masato Kagitani Akira Imada Irina B. Voloshina Maksim V. Andreev Richard Sabo Michael Richmond Tony Rodda Peter Nelson Sergey Nazarov Nikolay Mishevskiy Gordon Myers Denis Denisenko Krzysztof Z. Stanek Joseph V. Shields Christopher S. Kochanek Thomas W.-S. Holoien Benjamin Shappee Jose L. Prieto Koh-ichi Itagaki Koichi Nishiyama Fujio Kabashima Rod Stubbings Patrick Schmeer Eddy Muyllaert Tsuneo Horie Jeremy Shears Gary Poyner Masayuki Moriyama
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classification astro-ph.SR
keywords periodobjectsdwarfnovaesuperhumpsuma-typeorbitalsge-type
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Continuing the project described by Kato et al. (2009, arXiv:0905.1757), we collected times of superhump maxima for 127 SU UMa-type dwarf novae observed mainly during the 2016--2017 season and characterized these objects. We provide updated statistics of relation between the orbital period and the variation of superhumps, the relation between period variations and the rebrightening type in WZ Sge-type objects. We obtained the period minimum of 0.05290(2)d and confirmed the presence of the period gap above the orbital period ~0.09d. We note that four objects (NY Her, 1RXS J161659.5+620014, CRTS J033349.8-282244 and SDSS J153015.04+094946.3) have supercycles shorter than 100d but show infrequent normal outbursts. We consider that these objects are similar to V503 Cyg, whose normal outbursts are likely suppressed by a disk tilt. These four objects are excellent candidates to search for negative superhumps. DDE 48 appears to be a member of ER UMa-type dwarf novae. We identified a new eclipsing SU UMa-type object MASTER OT J220559.40-341434.9. We observed 21 WZ Sge-type dwarf novae during this interval and reported 18 out of them in this paper. Among them, ASASSN-16js is a good candidate for a period bouncer. ASASSN-16ia showed a precursor outburst for the first time in a WZ Sge-type superoutburst. ASASSN-16kg, CRTS J000130.5+050624 and SDSS J113551.09+532246.2 are located in the period gap. We have newly obtained 15 orbital periods, including periods from early superhumps.

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