1. Discovery of Standstills in the SU UMa-Type Dwarf Nova NY Serpentis
- Author
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Taichi Kato, Katsura Matsumoto, Vasyl O. Ponomarenko, Ian Miller, Roman Zhuchkov, Stephen M. Brincat, Kiyoshi Kasai, V. Vasylenko, Kenneth Menzies, Keisuke Isogai, Yuki Sugiura, Shawn Dvorak, Elena P. Pavlenko, A. Simon, Daiki Ito, Volodymyr A. Kozlov, Enrique de Miguel, Pavol A. Dubovsky, Aleksandr Sklyanov, Kirill A. Antonyuk, A. Baransky, Oksana I. Antonyuk, Inna O. Izviekova, Igor Kudzej, Aleksandr V. Sergeev, Aleksei V. Baklanov, Julia V. Babina, Yaroslav O. Romanjuk, Yutaka Maeda, Tomas Medulka, Aleksei A. Sosnovskij, Ryuhei Ohnishi, Nikolaj V. Pit, Hanami Matsumoto, Naoto Kojiguchi, Kengo Nikai, Sho Sumiya, Sergey P. Belan, A. G. Gutaev, Yasuyuki Wakamatsu, Takaaki Seki, Roger D. Pickard, and V. Godunova
- Subjects
Physics ,010308 nuclear & particles physics ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Radius ,Orbital period ,01 natural sciences ,Instability ,Accretion (astrophysics) ,Accretion disc ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,0103 physical sciences ,010303 astronomy & astrophysics ,Dwarf nova ,Solar and Stellar Astrophysics (astro-ph.SR) - Abstract
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)., 6 pages, 2 figures, Supporting information in si.pdf, accepted for publication in PASJ (Letters)
- Published
- 2019