OT J075418 .7+381225和OT J230425 .8+062546：周期边界的有希望的候选者
OT J075418.7+381225 and OT J230425.8+062546: Promising Candidates for the Period Bouncer
Chikako Nakata, Taichi Kato, Daisaku Nogami, Elena Pavlenko, Tomohito Ohshima, Enrique de Miguel, William Stein, Kazuhiko Siokawa, Etienne Morelle, Hiroshi Itoh… 展开作者
Chikako Nakata, Taichi Kato, Daisaku Nogami, Elena Pavlenko, Tomohito Ohshima, Enrique de Miguel, William Stein, Kazuhiko Siokawa, Etienne Morelle, Hiroshi Itoh, Pavol A. Dubovsky, Igor Kudzej, Hiroyuki Maehara, Arne Henden, William N. Goff, Shawn Dvorak, Oksana Antonyuk, Eddy Muyllaert
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24 pages, 10 figures, accepted for publication in PASJ
We report on photometric observations of two dwarf novae, OT J075418.7+381225 and OT J230425.8+062546, which underwent superoutburst in 2013 (OT J075418) and in 2011 (OT J230425). Their mean period of the superhump was 0.0722403(26) d (OT J074518) and 0.067317(35) d (OT J230425). These objects showed a very long growing stage of the superhump (stage A) and a large period decrease in stage A-B transition. The long stage A suggests slow evolution of the superhump due to very small mass ratios of these objects. The decline rates during the plateau phase in the superoutburst of these objects were lower than those of SU UMa-type DNe with a similar superhump period. These properties were similar to those of SSS J122221.7-311523, the best candidate for the period bouncer. Therefore, these two DNe are regarded as good candidates for the period bouncer. We estimated the number density of period bouncers roughly from our observations in the recent five years. There is a possibility that these WZ Sge-type dwarf novae with unusual outburst properties can account for the missing population of the period bouncer expected from the evolutionary scenario.
A probable inside-out dwarf nova outburst from the period bouncer candidate ASASSN-25dc
South African Astronomical Observatory（南非天文台）；University of Cape Town（开普敦大学）；Okayama Observatory, Kyoto University（京都大学冈山天文台）；Kyoto University（京都大学）；Kanazawa University（金泽大学）；The University of Tokyo（东京大学）；University of the Free State（自由州大学）
ZTF J021804.16+071152.93: a dead cataclysmic variable and potential solution to the missing period bouncers
University of Sheffield（谢菲尔德大学）；University of Hamburg（汉堡大学）；University of Leicester（莱斯特大学）；Institute of Science and Technology Austria（奥地利科学技术研究所）；University of Amsterdam（阿姆斯特丹大学）；Universitat Politècnica de Catalunya（加泰罗尼亚理工大学）；Institut d’Estudis Espacials de Catalunya（加泰罗尼亚空间研究所）；Centro de Astrobiología (CAB), CSIC-INTA（天体生物学中心（CAB），西班牙国家航空航天技术研究所/西班牙国家科学研究委员会）；Universidad de Valparaíso（瓦尔帕莱索大学）
Unveiling the period-bounce population of cataclysmic variables: Spectroscopic and time-domain follow-up of eROSITA-selected candidates
Eberhard Karls Universität Tübingen（蒂宾根大学）；Leibniz Institut für Astrophysik Potsdam (AIP)（波茨坦阿基米德天体物理研究所）；University of Potsdam（波茨坦大学）；University of Warwick（华威大学）；Penn State University（宾夕法尼亚州立大学）；University of Washington（华盛顿大学）；University of Utah（犹他大学）
