Spectroscopic and photometric observations of dwarf nova superoutbursts by the 3.8 m telescope Seimei and the Variable Star Network

• DOI: 10.1093/pasj/psab036
• Publication Date: 2021-04-13T21:50:31Z
• Authors: Yusuke Tampo; Keisuke Isogai; Naoto Kojiguchi; Hiroyuki Maehara; Kenta Taguchi; Taichi Kato; Mariko Kimura; Yasuyuki Wakamatsu; Masaaki Shibata; Daisaku Nogami; Miho Kawabata; Keiichi Maeda; Kosuke Namekata; Soshi Okamoto; Masaaki Otsuka; Umut Burgaz; Shumpei Nagoshi; Hiroshi Itoh; Tonny Vanmunster; Tamás Tordai; Geoffrey Stone; Katsura Matsumoto; Daiti Fujii; Ryota Matsumura; Momoka Nakagawa; Nodoka Takeuchi; Yuki Zenkou; Elena P Pavlenko; Kirill A Antonyuk; Nikolaj V Pit; Oksana I Antonyuk; Julia V Babina; Aleksei V Baklanov; Aleksei A Sosnovskij; Sergey Yu Shugarov; Nataly Katysheva; Drahomír Chochol; Shawn Dvorak; Pavol A Dubovsky; Tomáš Medulka; Igor Kudzej; Seiichiro Kiyota; Alexandra M Zubareva; Alexandr A Belinski; Natalia P Ikonnikova; Marina A Burlak; Yasuo Sano; Masanori Mizutani; Javier Ruiz; Roger D. Pickard; Franz-Josef Hambsch; Sjoerd Dufoer; Stephen M Brincat; Charles Galdies; Kenneth Menzies; Masayuki Moriyama; Mitsutaka Hiraga; Yutaka Maeda; Kenji Hirosawa; Masao Funada; Minoru Yamamoto
• Keywords: Dwarf nova; Cataclysmic variable star; Accretion disc

We present spectroscopic and photometric observations of 17 dwarf-nova superoutbursts obtained by KOOLS-IFU mounted on the 3.8 m telescope Seimei at Okayama Observatory Kyoto University through VSNET collaboration. Our for six outbursts were performed within 1 d from their optical peak. 11 objects (TCP J00590972+3438357. ASASSN-19ado, TCP J06073081-0101501, ZTF20aavnpug, ASASSN-19ady, MASTER OT J061642.05+435617.9, J20034647+1335125, ASASSN-20kv, ASASSN-20kw, J213908.79+161240.2, ASASSN-20mf) previously unknown systems, our enabled quick classification transient type. These results illustrate that has capability to conduct follow-up transients. yielded are WZ Sge-type dwarf novae candidates, other SU UMa-type candidates. The He II 4686\AA~ emission line was clearly detected among J06073081-0101501 whose association with a spiral arm structure in an accretion disk been suggested previous studies. result suggests higher-inclination system shows stronger 4686\AA, as well larger-amplitude early superhumps.