Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. VI: The Sixth Year (2013-2014)
Creators: name: Kato, Taichi
name: Dubovsky, Pavol A.
name: Kudzej, Igor
name: Hambsch, Franz-Josef
name: Miller, Ian
name: Ohshima, Tomohito
name: Nakata, Chikako
name: Kawabata, Miho
name: Nishino, Hirochika
name: Masumoto, Kazunari
name: Mizoguchi, Sahori
name: Yamanaka, Masayuki
name: Matsumoto, Katsura
name: Sakai, Daisuke
name: Fukushima, Daiki
name: Matsuura, Minami
name: Bouno, Genki
name: Takenaka, Megumi
name: Nakagawa, Shinichi
name: Noguchi, Ryo
name: Iino, Eriko
name: Pickard, Roger D.
name: Maeda, Yutaka
name: Henden, Arne
name: Kasai, Kiyoshi
name: Kiyota, Seiichiro
name: Akazawa, Hidehiko
name: Imamura, Kazuyoshi
name: de Miguel, Enrique
name: Maehara, Hiroyuki
name: Monard, Berto
name: Pavlenko, Elena P.
name: Antonyuk, Kirill
name: Pit, Nikolaj
name: Antonyuk, Oksana I.
name: Baklanov, Aleksei V.
name: Ruiz, Javier
name: Richmond, Michael
name: Oksanen, Arto
name: Harlingten, Caisey
name: Shugarov, Sergey Yu.
name: Chochol, Drahomir
name: Masi, Gianluca
name: Nocentini, Francesca
name: Schmeer, Patrick
name: Bolt, Greg
name: Nelson, Peter
name: Ulowetz, Joseph
name: Sabo, Richard
name: Goff, William N.
name: Stein, William
name: Michel, Raul
name: Dvorak, Shawn
name: Voloshina, Irina B.
name: Metlov, Vladimir
name: Katysheva, Natalia
name: Neustroev, Vitaly V.
name: Sjoberg, George
name: Littlefield, Colin
name: Debski, Bartlomiej
name: Sowicka, Paulina
name: Klimaszewski, Marcin
name: Curylo, Malgorzata
name: Morelle, Etienne
name: Curtis, Ivan A.
name: Iwamatsu, Hidetoshi
name: Butterworth, Neil D.
name: Andreev, Maksim V.
name: Parakhin, Nikolai
name: Sklyanov, Aleksandr
name: Shiokawa, Kazuhiko
name: Novak, Rudolf
name: Irsmambetova, Tat'yana R.
name: Itoh, Hiroshi
name: Ito, Yoshiharu
name: Hirosawa, Kenji
name: Denisenko, Denis
name: Kochanek, Christopher S.
name: Shappee, Benjamin
name: Stanek, Krzysztof Z.
name: Prieto, Jose L.
name: Itagaki, Koh-ichi
name: Stubbings, Rod
name: Ripero, Jose
name: Muyllaert, Eddy
name: Poyner, Gary
Publisher: name: arXiv
Year: 2014
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, 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.
description: 73 pages, 88 figures, accepted for publication in PASJ