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Título: | OT J002656.6+284933 (CSS101212:002657+284933): an SU UMa-type dwarf nova with the longest superhump period |
Autor: | Kato, Taichi; Tordai, Tamás; Littlefield, Colin; Kasai, Kiyoshi; Shugarov, Sergey Yu.; Katysheva, Natalia; Zaostrojnykh, Anna M.; Pickard, Roger D.; Miguel, Enrique de; Antonyuk, Kirill; Antonyuk, Oksana; Pavlenko, Elena P.; Pit, Nikolai; Itoh, Hiroshi; Ruiz, Javier CSIC ORCID; Isogai, Keisuke; Kimura, Mariko; Wakamatsu, Yasuyuki; Vanmunster, Tonny; Stone, Geoff | Fecha de publicación: | 2017 | Editor: | Oxford University Press | Citación: | Publications of the Astronomical Society of Japan 69(3): L4 (2017) | Resumen: | We observed the 2016 outburst of OT J002656.6+284933 (CSS101212:002657+284933) and found that it has the longest recorded [0.13225(1) d on average] superhumps among SU UMa-type dwarf novae. The object is the third known SU UMa-type dwarf nova above the period gap. The outburst, however, was unlike ordinary long-period SU UMa-type dwarf novae in that it showed two post-outburst rebrightenings. It showed superhump evolution similar to short-period SU UMa-type dwarf novae. We could constrain the mass ratio to less than 0.15 (most likely between 0.10 and 0.15) by using superhump periods in the early and post-superoutburst stages. These results suggest the possibility that OT J002656.6+284933 has an anomalously undermassive secondary and it should have followed a different evolutionary track from the standard one. | URI: | http://hdl.handle.net/10261/170604 | DOI: | 10.1093/pasj/psx020 | Identificadores: | doi: 10.1093/pasj/psx020 e-issn: 2053-051X issn: 0004-6264 |
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