1. Spectroscopic and photometric observations of dwarf nova superoutbursts by the 3.8 m telescope Seimei and the Variable Star Network
- Author
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Nodoka Takeuchi, Charles Galdies, Javier Ruiz, A. M. Zubareva, Sergey Yu. Shugarov, Kenneth Menzies, Geoffrey Stone, Keisuke Isogai, Mariko Kimura, Keiichi Maeda, Igor Kudzej, Daisaku Nogami, Kenta Taguchi, Kosuke Namekata, N. A. Katysheva, Minoru Yamamoto, Shumpei Nagoshi, Roger D. Pickard, Nikolaj V. Pit, Pavol A. Dubovsky, Naoto Kojiguchi, Yasuyuki Wakamatsu, Aleksei A. Sosnovskij, Katsura Matsumoto, Tonny Vanmunster, Seiichiro Kiyota, Momoka Nakagawa, Kirill A. Antonyuk, Sjoerd Dufoer, Shawn Dvorak, Aleksei V. Baklanov, Kenji Hirosawa, Masao Funada, Drahomir Chochol, Ryota Matsumura, Alexandr A. Belinski, Miho Kawabata, Taichi Kato, Oksana I. Antonyuk, Umut Burgaz, Tamás Tordai, Tomas Medulka, Yusuke Tampo, N. P. Ikonnikova, Masanori Mizutani, Soshi Okamoto, Mitsutaka Hiraga, Masaaki Otsuka, Hiroyuki Maehara, Yasuo Sano, Julia V. Babina, Hiroshi Itoh, Yutaka Maeda, Franz-Josef Hambsch, Daiti Fujii, M. A. Burlak, Yuki Zenkou, Elena P. Pavlenko, Stephen M. Brincat, Masaaki Shibata, Masayuki Moriyama, Japan Society for the Promotion of Science, and VEGA Agency (Slovakia)
- Subjects
Spiral Shocks ,FOS: Physical sciences ,Astrophysics ,01 natural sciences ,Wz Sge ,law.invention ,Telescope ,Accretion disc ,accretion ,law ,Ursae Majoris ,0103 physical sciences ,Ss-Cygni ,010303 astronomy & astrophysics ,Dwarf nova ,Solar and Stellar Astrophysics (astro-ph.SR) ,Physics ,novae ,Cataclysmic variables ,010308 nuclear & particles physics ,accretion disks ,Period Variations ,Astronomy and Astrophysics ,Time-Resolved Spectroscopy ,Accretion (astrophysics) ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,U-Geminorum ,Variable star ,Eg Cancri ,Stars: dwarf novae ,dwarf novae [Stars] - Abstract
arXiv:2104.04948v1, et al., 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 J20034647+1335125, 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., Maeda acknowledges support from the Japan Society for the Promotion of Science (JSPS) KAKENHI grant JP18H05223, JP20H00174, and JP20H04737. U. Burgaz acknowledges the support provided by the Turkish Scientific and Technical Research Council (TÜBITAK2211C and 2214A). This work was supported by the project APVV-15-0458 “Interacting binaries - Key for the Understanding of the Universe”. This work was supported by the Slovak Research and Development Agency under the contract No. APVV15-0458 and by the Slovak Academy of Sciences grant VEGA No. 2/0030/21. The authors from Sternberg institute thank the Program of Development of Lomonosov MSU ‘Leading Scientific Schools’. A.A.B, N.P.I. and M.A.B. (SAI MSU) are supported by the Interdisciplinary Scientific and Educational School of Moscow University ’Fundamental and Applied Space Research’. This research was partly supported by the Slovak Academy of Sciences grant VEGA No. 2/0030/21.
- Published
- 2021