OAO/MITSuME Photometry of Dwarf Novae: I SU Ursae Majoris
Akira Imada, Hideyuki Izumiura, Daisuke Kuroda, Kenshi Yanagisawa,, Toshihiro Omodaka, Ryo Miyanoshita, Nobuyuki Kawai, and Daisaku Nogami

TL;DR
This study presents multi-band photometry of SU Ursae Majoris, revealing complex quiescent states, characteristic normal outbursts, and pre-outburst reddening, suggesting a complicated thermal cycle and new insights into accretion disk behavior.
Contribution
It provides detailed multi-band observations of SU UMa, discovering pre-outburst reddening and complex thermal cycles, offering new perspectives on dwarf nova outburst mechanisms.
Findings
Quiescence divided into three types based on magnitude and color.
Normal outbursts are outside-in type with 11-21 day intervals.
Pre-outburst reddening of $g'-R_c$ detected about 3 days prior to outbursts.
Abstract
We report on simultaneous , and photometry of SU Ursae Majoris during 2011 December - 2012 February using OAO/MITSuME. Our photometry revealed that quiescence is divided into three types based on the magnitude and color. Quiescent light curves showed complicated profiles with various amplitudes and time scales. Although no superoutbursts were observed during our run, five normal outbursts occurred with intervals of 11 - 21 d. The shapes of the normal outbursts were characteristic of the outside-in type. During the rising phase of a normal outburst, the light curve showed periodic modulations with a period of 0.048111(354) d, but the origin of this peirod was unclear. We examined daily averaged color-color diagram and found that two cycles exist. This implies that the thermal limit cycle in SU UMa is complicated. We newly discovered that $g'-R_{\rm…
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