Spectroscopic and photometric observations of dwarf nova superoutbursts by the 3.8 m telescope Seimei and the Variable Star Network-Reference-Cited by-同舟云学术

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

Published:2021-05-17 Issue:3 Volume:73 Page:753-771
ISSN:0004-6264
Container-title:Publications of the Astronomical Society of Japan
language:en
Short-container-title:

Author:

Tampo Yusuke¹^ORCID,Isogai Keisuke¹²³,Kojiguchi Naoto¹,Maehara Hiroyuki²⁴⁵,Taguchi Kenta¹,Kato Taichi¹,Kimura Mariko¹⁶,Wakamatsu Yasuyuki¹,Shibata Masaaki¹,Nogami Daisaku¹,Kawabata Miho¹²,Maeda Keiichi¹,Namekata Kosuke¹⁷,Okamoto Soshi¹,Otsuka Masaaki¹²,Burgaz Umut¹⁸,Nagoshi Shumpei¹,Itoh Hiroshi⁹,Vanmunster Tonny¹⁰¹¹,Tordai Tamás¹²,Stone Geoffrey¹³,Matsumoto Katsura¹⁴,Fujii Daiti¹⁴,Matsumura Ryota¹⁴,Nakagawa Momoka¹⁴,Takeuchi Nodoka¹⁴,Zenkou Yuki¹⁴,Pavlenko Elena P¹⁵,Antonyuk Kirill A¹⁵,Pit Nikolaj V¹⁵,Antonyuk Oksana I¹⁵,Babina Julia V¹⁵,Baklanov Aleksei V¹⁵,Sosnovskij Aleksei A¹⁵,Shugarov Sergey Yu¹⁶¹⁷,Katysheva Nataly¹⁷,Chochol Drahomír¹⁶,Dvorak Shawn¹⁸,Dubovsky Pavol A¹⁹,Medulka Tomáš¹⁹,Kudzej Igor¹⁹,Kiyota Seiichiro²⁰,Zubareva Alexandra M¹⁷²¹,Belinski Alexandr A¹⁷,Ikonnikova Natalia P¹⁷,Burlak Marina A¹⁷,Sano Yasuo²²²³,Mizutani Masanori⁵,Ruiz Javier²⁴²⁵²⁶,D. Pickard Roger²⁷,Hambsch Franz-Josef²⁸²⁹³⁰,Dufoer Sjoerd³⁰,Brincat Stephen M³¹,Galdies Charles³²,Menzies Kenneth³³,Moriyama Masayuki³⁴,Hiraga Mitsutaka³⁵,Maeda Yutaka³⁶,Hirosawa Kenji³⁷,Funada Masao³⁸,Yamamoto Minoru³⁹

Affiliation:

1. Department of Astronomy, Graduate School of Science, Kyoto University, Oiwakecho, Kitashirakawa, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan

2. Okayama Observatory, Kyoto University, 3037-5 Honjo, Kamogatacho, Asakuchi, Okayama 719-0232, Japan

3. Department of Multi-Disciplinary Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan

4. Subaru Telescope Okayama Branch Office, National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 3037-5 Honjo, Kamogata, Asakuchi, Okayama 719-0232, Japan

5. Variable Star Observers League in Japan (VSOLJ), Okayama, Japan

6. Extreme Natural Phenomena RIKEN Hakubi Research Team, Cluster for Pioneering Research, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

7. National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

8. Department of Astronomy and Space Sciences, University of Ege, 35100, İzmir, Turkey

9. Variable Star Observers League in Japan (VSOLJ), 1001-105 Nishiterakata, Hachioji, Tokyo 192-0153, Japan

10. Center for Backyard Astrophycis Belgium, Walhostraat 1a, B-3401 Landen, Belgium

11. Center for Backyard Astrophycis Extremadura, e-EyE Astronomical Complex, ES-06340 Fregenal de la Sierra, Spain

12. Polaris Observatory, Hungarian Astronomical Association, Laborc utca 2/c, 1037 Budapest, Hungary

13. Center for Backyard Astrophysics Sierras, 44325 Alder Heights Road, Auberry, CA 93602, USA

14. Osaka Kyoiku University, 4-698-1 Asahigaoka, Kashiwara, Osaka 582-8582, Japan

15. Federal State Budget Scientific Institution Crimean Astrophysical Observatory of RAS, Nauchny, 298409, Republic of Crimea

16. Astronomical Institute of the Slovak Academy of Sciences, 05960 Tatranská Lomnica, Slovakia

17. Sternberg Astronomical Institute, Lomonosov Moscow State University, Universitetsky Ave.,13, Moscow 119992, Russia

18. Rolling Hills Observatory, 1643 Nightfall Drive, Clermont, FL 34711, USA

19. Vihorlat Observatory, Mierova 4, 06601 Humenne, Slovakia

20. Variable Star Observers League in Japan (VSOLJ), 7-1 Kitahatsutomi, Kamagaya, Chiba 273-0126, Japan

21. Institute of Astronomy, Russian Academy of Sciences, Moscow 119017, Russia

22. Variable Star Observers League in Japan (VSOLJ), Nishi juni-jou minami 3-1-5, Nayoro, Hokkaido, Japan

23. Observation and Data Center for Cosmosciences, Faculty of Science, Hokkaido University, Kita-ku, Sapporo, Hokkaido 060-0810, Japan

24. Observatorio de Cantabria, Ctra. de Rocamundo s/n, Valderredible, 39220, Cantabria, Spain

25. Instituto de Fisica de Cantabria (CSIC-UC), Avda. Los Castros s/n, 39005, Santander, Spain

26. Agrupacion Astronomica Cantabra, Apartado 573, 39080, Santander, Spain

27. The British Astronomical Association, Variable Star Section (BAA VSS), Burlington House, Piccadilly, London, W1J 0DU, UK

28. Groupe Européen d’Observations Stellaires (GEOS), 23 Parc de Levesville, 28300 Bailleau l’Evêque, France

29. Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne (BAV), Munsterdamm 90, 12169 Berlin, Germany

30. Vereniging Voor Sterrenkunde (VVS), Oostmeers 122 C, 8000 Brugge, Belgium

31. Flarestar Observatory, San Gwann SGN 3160, Malta

32. Institute of Earth Systems, University of Malta, Malta

33. Center for Backyard Astrophysics (Framingham), 318A Potter Road, Framingham, MA 01701, USA

34. Variable Star Observers League in Japan (VSOLJ), 290-383, Ogata-cho, Sasebo, Nagasaki, Japan

35. Variable Star Observers League in Japan (VSOLJ), Shimonoseki, Yamaguchi, Japan

36. Variable Star Observers League in Japan (VSOLJ), 12-2 Kaminishiyamamachi, Nagasaki, Nagasaki, Japan

37. Variable Star Observers League in Japan (VSOLJ), 216-4 Maeda, Inazawa-cho, Inazawa-shi, Aichi, Japan

38. Variable Star Observers League in Japan (VSOLJ), Chiba, Japan

39. Variable Star Observers League in Japan (VSOLJ), Aichi, Japan

Abstract

Abstract 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.

Funder

Japan Society for the Promotion of Science

Turkish Scientific and Technical Research Council

Slovak Academy of Sciences

National Science Foundation

Science and Technology Facilities Council

University of Edinburgh

Queen's University Belfast

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics