First Detection of Two Superoutbursts during Rebrightening Phase of a WZ Sge-type Dwarf Nova: TCP J21040470+4631129

Yusuke Tampo, Kojiguchi Naoto, Keisuke Isogai, Taichi Kato, Mariko Kimura, Yasuyuki Wakamatsu, Daisaku Nogami, Tonny Vanmunster, Tamás Tordai, Hidehiko Akazawa, Felipe Mugas, Taku Nishiumi, Víctor J. S. Béjar, Kiyoe Kawauchi, Nicolas Crouzet, Noriharu Watanabe, Núria Casasayas-Barris, Yuka Terada, Akihiko Fukui, Norio Narita, Enric Palle, Motohide Tamura, Nobuhiko Kusakabe, Roi Alonso, Hiroshi Itoh, Kirill Sokolovsky, Brandon McIntyre, Jesse Leahy-McGregor, Stephen M. Brincat, Pavol A. Dubovsky, Tomáš Medulka, Igor Kudzej, Elena P. Pavlenko, Kirill A. Antonyuk, Nikolaj V. Pit, Oksana I. Antonyuk, Julia V. Babina, Aleksei V. Baklanov, Aleksander S. Sklyanov, Alexandra M. Zubareva, Aleksandr A. Belinski, Alexandr V. Dodin, Marina A. Burlak, Natalia P. Ikonnikova, Egor O. Mishin, Sergey A. Potanin, Ian Miller, Michael Richmond, Roger D. Pickard, Charles Galdies, Masanori Mizutani, Kenneth Menzies, Geoffrey Stone, Javier Ruiz

Published 2020-04-22Version 1

We report photometric and spectroscopic observations and analysis of the 2019 superoutburst of TCP J21040470+4631129. This object showed a 9-mag superoutburst with early superhumps and ordinary superhumps, which are the features of WZ Sge-type dwarf novae. Five rebrightenings were observed after the main superoutburst. The spectra during the post-superoutburst stage showed the Balmer, He I and possible sodium doublet features. The mass ratio is derived as 0.0880(9) from the period of the superhump. During the third and fifth rebrightenings, growing superhumps and superoutbursts were observed, which have never been detected during a rebrightening phase among WZ Sge-type dwarf novae with multiple rebrightenings. To induce a superoutburst during the brightening phase, the accretion disk was needed to expand beyond the 3:1 resonance radius of the system again after the main superoutburst. These peculiar phenomena can be explained by the enhanced viscosity and large radius of the disk suggested by the higher luminosity and the presence of late-stage superhumps during the post-superoutburst stage, plus by more mass supply from the cool mass reservoir and/or from the secondary because of the enhanced mass transfer than those of other WZ Sge-type dwarf novae.