New Aspects of WZ Sge-Type Dwarf Novae through Simultaneous Optical-Infrared Observations during Superoutbursts

Details New Aspects of WZ Sge-Type Dwarf Novae through Simultaneous Optical-Infrared Observations during Superoutbursts New Aspects of WZ Sge-Type Dwarf Novae through Simultaneous Optical-Infrared Observations during Superoutbursts

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..404...64u&link_type=abstract

The Eighth Pacific Rim Conference on Stellar Astrophysics: A Tribute to Kam-Ching Leung ASP Conference Series, Vol. 404, proceed

Astronomy and Astrophysics

Astrophysics

Scientific paper

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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