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

Yusuke Tampo, Keisuke Isogai, Naoto Kojiguchi, Hiroyuki Maehara, Kenta Taguchi, Taichi Kato, Mariko Kimura, Yasuyuki Wakamatsu, Masaaki Shibata, Daisaku Nogami, Miho Kawabata, Keiichi Maeda (+49 others)
2021 Nippon Tenmon Gakkai obun kenkyu hokoku  

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We present spectroscopic and photometric observations of 17 dwarf-nova superoutbursts obtained by KOOLS-IFU mounted on the 3.8 m telescope Seimei at the Okayama Observatory of Kyoto University and through the Variable Star Network collaboration (VSNET). Our spectroscopic observations for six outbursts were performed within 1 d of their optical peak. 11 objects (TCP J00590972+3438357, ASASSN-19ado, TCP J06073081−0101501, ZTF20aavnpug, ASASSN-19ady, MASTER OT J061642.05+435617.9, TCP
more » ... 5125, ASASSN-20kv, ASASSN-20kw, MASTER OT J213908.79+161240.2, and ASASSN-20mf) were previously unknown systems, and our observations enabled quick classification of their transient type. These results illustrate that the Seimei telescope has the capability to conduct quick follow-up observations of unknown transients. Our photometric observations yielded that 11 of the objects are WZ Sge-type dwarf novae and their candidates, and the other six are SU UMa-type dwarf novae and their candidates. The He ii 4686 Å emission line was clearly detected among ASASSN-19ado, TCP J06073081−0101501 and MASTER OT J213908.79+161240.2, the association of which with a spiral arm structure in an accretion disk has been suggested in previous studies. Our result suggests that a higher-inclination system shows a stronger emission line of He ii 4686 Å, as well as larger-amplitude early superhumps.
doi:10.1093/pasj/psab036 fatcat:qghfslasifhrhenlsy3xnnwm5q
Citation

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. "Spectroscopic and photometric observations of dwarf nova superoutbursts by the 3.8 m telescope Seimei and the Variable Star Network." Nippon Tenmon Gakkai obun kenkyu hokoku 73.3 (2021)