Observational study of double superoutbursts in long-orbital-period AM CVn stars

Kojiguchi, N.; Isogai, K.; Tampo, Y.; Kato, T.; Itoh, H.; Monard, B.; Hambsch, F.; Wakamatsu, Y.; Ohshima, T.; Ito, J.; Shibata, M.; Ohnishi, R.; Kimura, M.; Dubovsky, P.A.; Medulka, T.; De Miguel, E.; Sugiura, Y.; Ito, D.; Matsumoto, H.; Sumiya, S.; Nikai, K.; Zenko, Y.; Matsumura, R.; Fujii, D.; Kato, T.; Matsumoto, K.; Vanmunster, T.; Stein, W.; Kubotera, K.; Tordai, T.; Antonyuk, K.; Antonyuk, O.; Pit, N.; Sosnovskij, A.; Baklanov, A.; Babina, J.; Pavlenko, E.P.; Costello, M.; Masumoto, K.; Fukushima, D.; Takenaka, M.; Kawabata, M.; Sakai, D.; Maeda, K.; Matsuda, R.; Masi, G.; Starr, P.; Dvorak, S.; Rock, J.W.; Cook, M.J.; Ulowetz, J.H.; Maeda, Y.; Michel, R.; Shugarov, S.Y.; Chochol, D.; Cook, L.M.; Licchelli, D.; Dufoer, S.; Menzies, K.; Novák, R.; Brincat, S.M.; Coates, G.; Romanov, F.D.; Lane, D.J.; Muyllaert, E.; Stone, G.; Hovell, S.; Stubbings, R.; Nogami, D.

Авторы: Kojiguchi Naoto, Isogai Keisuke, Tampo Yusuke, Kato Taichi, Itoh Hiroshi, Monard Berto, Hambsch Franz-Josef, Wakamatsu Yasuyuki, Ohshima Tomohito, Ito Junpei, Shibata Masaaki, Ohnishi Ryuhei, Kimura Mariko, Dubovsky Pavol A., Medulka Tomas, De Miguel Enrique, Sugiura Yuki, Ito Daiki, Matsumoto Hanami, Sumiya Sho, Nikai Kengo, Zenko Yuki, Matsumura Ryota, Fujii Daiti, Kato Taiti, Matsumoto Katsura, Vanmunster Tonny, Stein William, Kubotera Katsuaki, Tordai Tamás, Antonyuk Kirill, Antonyuk Oksana, Pit Nikolaj, Sosnovskij Aleksei, Baklanov Alex, Babina Julia, Pavlenko Elena P., Costello Marlin, Masumoto Kazunari, Fukushima Daiki, Takenaka Megumi, Kawabata Miho, Sakai Daisuke, Maeda Kazuki, Matsuda Risa, Masi Gianluca, Starr Peter, Dvorak Shawn, Rock John W., Cook Michael J., Ulowetz Joseph H., Maeda Yutaka, Michel Raúl, Shugarov Sergey Yu, Chochol Drahomir, Cook Lewis M., Licchelli Domenico, Dufoer Sjoerd, Menzies Kenneth, Novák Rudolf, Brincat Stephen M., Coates Graeme, Romanov Filipp D., Lane David J., Muyllaert Eddy, Stone Geoffrey, Hovell Stephen, Stubbings Rod, Nogami Daisaku
Журнал: PASJ
Том: 78
Номер: 1
Год издания: 2026
Первая страница: 199
Последняя страница: 219
DOI: 10.1093/pasj/psaf133
Аннотация: We present an observational study of superoutbursts in six AM CVn systems with orbital periods longer than 35 min. We focused on this range because such systems are expected to have very low mass ratios, making them particularly likely to exhibit double superoutbursts and fading-tail profiles. Using time-resolved photometry from the Variable Star Network and the American Association of Variable Star Observers campaigns, complemented by survey data from the Zwicky Transient Facility, the All-Sky Automated Survey for Supernovae, the Asteroid Terrestrial-impact Last Alert System, Gaia, and the Transiting Exoplanet Survey Satellite, we analyzed nine superoutbursts observed between 2014 and 2021. Among them, four events exhibited clear double superoutburst profiles, analogous to those seen in hydrogen-rich WZ Sge-type dwarf novae. We characterized the fading tail following the second superoutburst and found that it can be divided into three distinct phases (tails A, B, and C) with different power-law fading indices. The effective superoutburst durations were typically 7─13 d, while the dip duration is significantly different among systems. Notably, the effective durations of the second superoutbursts in the double superoutburst were consistently around 5 d. These results highlight the importance of thermal─tidal instabilities in explaining the outbursts of long-orbital-period AM CVn stars. They also suggested that the three-phase fading-tail structure may be a universal feature of the systems and further imply that in systems with short supercycles the effective viscosity during quiescence could be higher than expected from a true quiescent state.
Добавил в систему: Шугаров Сергей Юрьевич

	ИСТИНА	Войти в систему Регистрация
	ИСТИНА ПсковГУ
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

ИСТИНА ПсковГУ

Observational study of double superoutbursts in long-orbital-period AM CVn starsстатья

Прикрепленные файлы