Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. IX: The Ninth Year (2016-2017)
Creators: name: Kato, Taichi
name: Isogai, Keisuke
name: Hambsch, Franz-Josef
name: Vanmunster, Tonny
name: Itoh, Hiroshi
name: Monard, Berto
name: Tordai, Tamaas
name: Kimura, Mariko
name: Wakamatsu, Yasuyuki
name: Kiyota, Seiichiro
name: Miller, Ian
name: Starr, Peter
name: Kasai, Kiyoshi
name: Shugarov, Sergey Yu.
name: Chochol, Drahomir
name: Katysheva, Natalia
name: Zaostrojnykh, Anna M.
name: Sekeras, Matej
name: Kuznyetsova, Yuliana G.
name: Kalinicheva, Eugenia S.
name: Golysheva, Polina
name: Krushevska, Viktoriia
name: Maeda, Yutaka
name: Dubovsky, Pavol A.
name: Kudzej, Igor
name: Pavlenko, Elena P.
name: Antonyuk, Kirill A.
name: Pit, Nikolaj V.
name: Sosnovskij, Aleksei A.
name: Antonyuk, Oksana I.
name: Baklanov, Aleksei V.
name: Pickard, Roger D.
name: Kojiguchi, Naoto
name: Sugiura, Yuki
name: Tei, Shihei
name: Yamamura, Kenta
name: Matsumoto, Katsura
name: Ruiz, Javier
name: Stone, Geoff
name: Cook, Lewis M.
name: de Miguel, Enrique
name: Akazawa, Hidehiko
name: Goff, William N.
name: Morelle, Etienne
name: Kafka, Stella
name: Littlefield, Colin
name: Bolt, Greg
name: Dubois, Franky
name: Brincat, Stephen M.
name: Maehara, Hiroyuki
name: Sakanoi, Takeshi
name: Kagitani, Masato
name: Imada, Akira
name: Voloshina, Irina B.
name: Andreev, Maksim V.
name: Sabo, Richard
name: Richmond, Michael
name: Rodda, Tony
name: Nelson, Peter
name: Nazarov, Sergey
name: Mishevskiy, Nikolay
name: Myers, Gordon
name: Denisenko, Denis
name: Stanek, Krzysztof Z.
name: Shields, Joseph V.
name: Kochanek, Christopher S.
name: Holoien, Thomas W. -S.
name: Shappee, Benjamin
name: Prieto, Jose L.
name: Itagaki, Koh-ichi
name: Nishiyama, Koichi
name: Kabashima, Fujio
name: Stubbings, Rod
name: Schmeer, Patrick
name: Muyllaert, Eddy
name: Horie, Tsuneo
name: Shears, Jeremy
name: Poyner, Gary
name: Moriyama, Masayuki
Publisher: name: arXiv
Year: 2017
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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.
description: 126 pages. 168 figures, accepted for publication in PASJ. For readers' convenience, combined version with Supplementary Information is provided. See Ancillary files for the PASJ version (correction in author list)