First detection of two superoutbursts during the rebrightening phase of a WZ Sge-type dwarf nova: TCP J21040470+4631129

Author:

Tampo Yusuke1,Naoto Kojiguchi1,Isogai Keisuke12,Kato Taichi1,Kimura Mariko1,Wakamatsu Yasuyuki1,Nogami Daisaku1,Vanmunster Tonny34,Tordai Tamás5,Akazawa Hidehiko6,Mugas Felipe78,Nishiumi Taku910,Béjar Víctor J S78,Kawauchi Kiyoe11,Crouzet Nicolas12,Watanabe Noriharu101314,Casasayas-Barris Núria78,Terada Yuka15,Fukui Akihiko711,Narita Norio7101416,Palle Enric78,Tamura Motohide101415,Kusakabe Nobuhiko1014,Alonso Roi78,Itoh Hiroshi17,Sokolovsky Kirill1819,McIntyre Brandon18,Leahy-McGregor Jesse18,Brincat Stephen M20,Dubovsky Pavol A21,Medulka Tomáš21,Kudzej Igor21,Pavlenko Elena P22,Antonyuk Kirill A22,Pit Nikolaj V22,Antonyuk Oksana I22,Babina Julia V22,Baklanov Aleksei V22,Sklyanov Aleksander S23,Zubareva Alexandra M1924,Belinski Aleksandr A19,Dodin Alexandr V19,Burlak Marina A19,Ikonnikova Natalia P19,Mishin Egor O9,Potanin Sergey A19,Miller Ian25,Richmond Michael26,Pickard Roger D27,Galdies Charles28,Mizutani Masanori29,Menzies Kenneth30,Stone Geoffrey31,Ruiz Javier323334

Affiliation:

1. Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan

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

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

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

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

6. Funao Astronomical Observatory, 107 Funao, Kurashiki, Okayama 710-0261, Japan

7. Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain

8. Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38206 La Laguna, Tenerife, Spain

9. Department of Physics, Faculty of Science, Kyoto Sangyo University, Motoyama, Kamigamo, Kita-ku, Kyoto, Kyoto 603-8555, Japan

10. National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

11. Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

12. Science Support Office, Directorate of Science, European Space Research and Technology Centre (ESA/ESTEC), Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands

13. Department of Astronomical Science, The Graduate University for Advanced Studies, SOKENDAI, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

14. Astrobiology Center, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

15. Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

16. JST, PRESTO, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

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

18. Department of Physics and Astronomy, Michigan State University, 567 Wilson Rd, East Lansing, MI 48824, USA

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

20. Flarestar Observatory, San Gwann SGN 3160, Malta

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

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

23. FGAOU VO, Kazan (Volga) Federal University, Kazan, Russia

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

25. Furzehill House, Ilston, Swansea, SA2 7LE, UK

26. Physics Department, Rochester Institute of Technology, One Lomb Memorial Drive, Rochester, New York 14623, USA

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

28. Institute of Earth Systems, University of Malta, Msida MSD 2080, Malta

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

30. Center for Backyard Astrophysics (Framingham), 318A Potter Road, Framingham, MA01701, USA

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

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

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

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

Abstract

Abstract We report on 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 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 needs to have expanded 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 accretion 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.

Funder

JSPS

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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