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Discovery of Standstills in the SU UMa-Type Dwarf Nova NY Serpentis

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arxiv 1901.05100 v1 pith:ADLEZ7VL submitted 2019-01-16 astro-ph.SR

Discovery of Standstills in the SU UMa-Type Dwarf Nova NY Serpentis

Taichi Kato (Kyoto U) , Elena P. Pavlenko , Nikolaj V. Pit , Kirill A. Antonyuk , Oksana I. Antonyuk , Julia V. Babina , Aleksei V. Baklanov , Aleksei A. Sosnovskij
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Sergey P. Belan Yutaka Maeda Yuki Sugiura Sho Sumiya Hanami Matsumoto Daiki Ito Kengo Nikai Naoto Kojiguchi Katsura Matsumoto Pavol A. Dubovsky Igor Kudzej Tomas Medulka Yasuyuki Wakamatsu Ryuhei Ohnishi Takaaki Seki Keisuke Isogai Andrii O. Simon Yaroslav O. Romanjuk Alexsandr R. Baransky Aleksandr V. Sergeev Vira G. Godunova Inna O. Izviekova Volodymyr A. Kozlov Aleksandr S. Sklyanov Roman Ya. Zhuchkov Alexei G. Gutaev Vasyl O. Ponomarenko Volodymyr V. Vasylenko Ian Miller Kiyoshi Kasai Shawn Dvorak Kenneth Menzies Enrique de Miguel Stephen M. Brincat Roger D. Pickard
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classification astro-ph.SR
keywords standstillsdiskduringdwarfnovastandstilluma-typeclose
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We found that the SU UMa-type dwarf nova NY Ser in the period gap [orbital period 0.097558(6) d] showed standstills twice in 2018. This is the first clear demonstration of a standstill occurring between superoutbursts of an SU UMa-type dwarf nova. There was no sign of superhumps during the standstill, and at least one superoutburst directly started from the standstill. This provides strong evidence that the 3:1 resonance was excited during standstills. This phenomenon indicates that the disk radius can grow during standstills. We also interpret that the condition close to the limit of the tidal instability caused early quenching of superoutbursts, which resulted substantial amount of matter left in the disk after the superoutburst. We interpret that the substantial matter in the disk in condition close to the limit of the tidal instability is responsible for standstills (as in the high mass-transfer system NY Ser) or multiple rebrightenings (as in the low mass-transfer system V1006 Cyg).

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