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We analyzed optical/X-ray quasi-simultaneous light curves of Aql X-1,obtained by MAXI (Monitor of All-sky X-ray Image), ZTF (Zwicky TransientFacility) and LCO (Las Cumbres Observatory) in about 3.6 years from 2016, forunderstanding electromagnetic radiation mechanisms during its outbursts. As aresult, we confirmed that 5 outbursts had detected in the epoch, and that 3outbursts underwent the X-ray state transition across Low-Hard, In-Transition,and High-Soft state while remaining 2 outbursts stayed in the Low-Hard state.We found that the optical spectral energy distribution in the High-Soft stateis consistent with a simplified irradiated disk model, and that the opticalcolor/magnitude variation can be explained by variations in the X-rayluminosity and the disk geometrical thickness.

Optical and X-ray variations during 5 outbursts of Aql X-1 in 3.6 years from 2016