Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. VIII: The Eighth Year (2015-2016)
Creators: name: Kato, Taichi
name: Hambsch, Franz-Josef
name: Monard, Berto
name: Vanmunster, Tonny
name: Maeda, Yutaka
name: Miller, Ian
name: Itoh, Hiroshi
name: Kiyota, Seiichiro
name: Isogai, Keisuke
name: Kimura, Mariko
name: Imada, Akira
name: Tordai, Tamas
name: Akazawa, Hidehiko
name: Tanabe, Kenji
name: Otani, Noritoshi
name: Ogi, Minako
name: Ando, Kazuko
name: Takigawa, Naoki
name: Dubovsky, Pavol A.
name: Kudzej, Igor
name: Shugarov, Sergey Yu.
name: Katysheva, Natalia
name: Golysheva, Polina
name: Gladilina, Natalia
name: Chochol, Drahomir
name: Starr, Peter
name: Kasai, Kiyoshi
name: Pickard, Roger D.
name: de Miguel, Enrique
name: Kojiguchi, Naoto
name: Sugiura, Yuki
name: Fukushima, Daiki
name: Yamada, Eiji
name: Uto, Yusuke
name: Kamibetsunawa, Taku
name: Tatsumi, Taiki
name: Takeda, Nao
name: Matsumoto, Katsura
name: Cook, Lewis M.
name: Pavlenko, Elena P.
name: Babina, Julia V.
name: Pit, Nikolaj V.
name: Antonyuk, Oksana I.
name: Antonyuk, Kirill A.
name: Sosnovskij, Aleksei A.
name: Baklanov, Aleksei V.
name: Kafka, Stella
name: Stein, William
name: Voloshina, Irina B.
name: Ruiz, Javier
name: Sabo, Richard
name: Dvorak, Shawn
name: Stone, Geoff
name: Andreev, Maksim V.
name: Antipin, Sergey V.
name: Zubareva, Alexandra M.
name: Zaostrojnykh, Anna M.
name: Richmond, Michael
name: Shears, Jeremy
name: Dubois, Franky
name: Logie, Ludwig
name: Rau, Steve
name: Vanaverbeke, Siegfried
name: Simon, Andrei
name: Oksanen, Arto
name: Goff, William N.
name: Bolt, Greg
name: Debski, Bartomiej
name: Kochanek, Christopher S.
name: Shappee, Benjamin
name: Stanek, Krzysztof Z.
name: Prieto, Jose L.
name: Stubbings, Rod
name: Muyllaert, Eddy
name: Hiraga, Mitsutaka
name: Horie, Tsuneo
name: Schmeer, Patrick
name: Hirosawa, Kenji
Publisher: name: arXiv
Year: 2016
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 128 SU UMa-type dwarf novae observed mainly during the 2015-2016 season and characterized these objects. The data have improved the distribution of orbital periods, 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. Coupled with new measurements of mass ratios using growing stages of superhumps, we now have a clearer and statistically greatly improved evolutionary path near the terminal stage of evolution of cataclysmic variables. Three objects (V452 Cas, KK Tel, ASASSN-15cl) appear to have slowly growing superhumps, which is proposed to reflect the slow growth of the 3:1 resonance near the stability border. ASASSN-15sl, ASASSN-15ux, SDSS J074859.55+312512.6 and CRTS J200331.3-284941 are newly identified eclipsing SU UMa-type (or WZ Sge-type) dwarf novae. ASASSN-15cy has a short (~0.050 d) superhump period and appears to belong to EI Psc-type objects with compact secondaries having an evolved core. ASASSN-15gn, ASASSN-15hn, ASASSN-15kh and ASASSN-16bu are candidate period bouncers with superhump periods longer than 0.06 d. We have newly obtained superhump periods for 79 objects and 13 orbital periods, including periods from early superhumps. In order that the future observations will be more astrophysically beneficial and rewarding to observers, we propose guidelines how to organize observations of various superoutbursts.
description: 123 pages, 162 figures, 119 tables, accepted for publication in PASJ (including supplementary information)