Discovery of Standstills in the SU UMa-Type Dwarf Nova NY Serpentis
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).
Cite
@article{arxiv.1901.05100,
title = {Discovery of Standstills in the SU UMa-Type Dwarf Nova NY Serpentis},
author = {Taichi Kato and Elena P. Pavlenko and Nikolaj V. Pit and Kirill A. Antonyuk and Oksana I. Antonyuk and Julia V. Babina and Aleksei V. Baklanov and Aleksei A. Sosnovskij and Sergey P. Belan and Yutaka Maeda and Yuki Sugiura and Sho Sumiya and Hanami Matsumoto and Daiki Ito and Kengo Nikai and Naoto Kojiguchi and Katsura Matsumoto and Pavol A. Dubovsky and Igor Kudzej and Tomas Medulka and Yasuyuki Wakamatsu and Ryuhei Ohnishi and Takaaki Seki and Keisuke Isogai and Andrii O. Simon and Yaroslav O. Romanjuk and Alexsandr R. Baransky and Aleksandr V. Sergeev and Vira G. Godunova and Inna O. Izviekova and Volodymyr A. Kozlov and Aleksandr S. Sklyanov and Roman Ya. Zhuchkov and Alexei G. Gutaev and Vasyl O. Ponomarenko and Volodymyr V. Vasylenko and Ian Miller and Kiyoshi Kasai and Shawn Dvorak and Kenneth Menzies and Enrique de Miguel and Stephen M. Brincat and Roger D. Pickard},
journal= {arXiv preprint arXiv:1901.05100},
year = {2019}
}
Comments
6 pages, 2 figures, Supporting information in si.pdf, accepted for publication in PASJ (Letters)