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Kato, Taichi; Tordai, Tamás; Littlefield, Colin; Kasai, Kiyoshi; Shugarov, Sergey Yu; Katysheva, Natalia; Zaostrojnykh, Anna M; Pickard, Roger D; de Miguel, Enrique; Antonyuk, Kirill; Antonyuk, Oksana; Pavlenko, Elena P; Pit, Nikolai; Itoh, Hiroshi; Ruiz, Javier; Isogai, Keisuke; Kimura, Mariko; Wakamatsu, Yasuyuki; Vanmunster, Tonny; Stone, Geoff
Publications of the Astronomical Society of Japan, 06/2017, Letnik: 69, Številka: 3Journal Article
Abstract 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.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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