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Paper: New Aspects of WZ Sge-Type Dwarf Novae through Simultaneous Optical-Infrared Observations during Superoutbursts
Volume: 404, The Eighth Pacific Rim Conference on Stellar Astrophysics: A Tribute to Kam Ching Leung
Page: 64
Authors: Uemura, M.; Arai, A.; Matsui, R.; Sasada, M.; Ohsugi, T.; Yamashita, T.; Kawabata, K.S.; Sato, S.; Kino, M.; Yoshida, M.; Kawai N.
Abstract: WZ Sge-type dwarf novae are characterized by very long recurrence times (≥10 yr). They also exhibit various types of rebrightenings after main outbursts, while the mechanism of the rebrightening phenomenon is poorly understood. Here, we report simultaneous g, V , Rc, Ic, J, and Ks-band observations throughout WZ Sge-type superoutbursts. We found unprecedented infrared activities, for example, prominent infrared superhumps and a temporary quite red state just after superoutbursts. They provide evidence for the presence of a mass reservoir at the outermost part of accretion disks, which is responsible for the rebrightening phenomenon.
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