Survey of period variations of superhumps in SU UMa-type dwarf novae. IX. the ninth year (2016-2017)

Taichi Kato, Keisuke Isogai, Franz Josef Hambsch, Tonny Vanmunster, Hiroshi Itoh, Berto Monard, Tamás Tordai, Mariko Kimura, Yasuyuki Wakamatsu, Seiichiro Kiyota, Ian Miller, Peter Starr, Kiyoshi Kasai, Sergey Yu Shugarov, Drahomir Chochol, Natalia Katysheva, Anna M. Zaostrojnykh, Matej Sekeráš, Yuliana G. Kuznyetsova, Eugenia S. KalinichevaPolina 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, José L. Prieto, Koh Ichi Itagaki, Koichi Nishiyama, Fujio Kabashima, Rod Stubbings, Patrick Schmeer, Eddy Muyllaert, Tsuneo Horie, Jeremy Shears, Gary Poyner, Masayuki Moriyama

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Continuing the project described by Kato et al. (2009, PASJ, 61, S395), 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 the 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 ∼0.09 d. 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 100 d 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 report 18 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.

Original languageEnglish
Article number75
JournalPublications of the Astronomical Society of Japan
Volume69
Issue number5
DOIs
Publication statusPublished - 2017 Oct 1

Keywords

  • accretion, accretion disks
  • novae, cataclysmic variables
  • stars: dwarf novae

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Kato, T., Isogai, K., Hambsch, F. J., Vanmunster, T., Itoh, H., Monard, B., Tordai, T., Kimura, M., Wakamatsu, Y., Kiyota, S., Miller, I., Starr, P., Kasai, K., Shugarov, S. Y., Chochol, D., Katysheva, N., Zaostrojnykh, A. M., Sekeráš, M., Kuznyetsova, Y. G., ... Moriyama, M. (2017). Survey of period variations of superhumps in SU UMa-type dwarf novae. IX. the ninth year (2016-2017). Publications of the Astronomical Society of Japan, 69(5), [75]. https://doi.org/10.1093/pasj/psx058