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Title
Japanese: 
English:Optical and X-ray variations during five outbursts of Aql X-1 in 3.6 yr from 2016 
Author
Japanese: 庭野聖史, 村田勝寛, 伊藤尚泰, 谷津陽一, 河合誠之.  
English: Masafumi Niwano, Katsuhiro L. Murata, Naohiro Ito, Yoichi Yatsu, Nobuyuki Kawai.  
Language English 
Journal/Book name
Japanese: 
English:Monthly Notices of the Royal Astronomical Society 
Volume, Number, Page Volume 525    Issue 3    pp. 4358-4366
Published date Aug. 31, 2023 
Publisher
Japanese: 
English:Oxford University Press 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
File
Official URL https://academic.oup.com/mnras/article/525/3/4358/7257574
 
DOI https://doi.org/10.1093/mnras/stad2561
Abstract We analysed optical/X-ray quasi-simultaneous light curves of Aql X-1, obtained by Monitor of All-sky X-ray Image, Zwicky Transient Facility, and Las Cumbres Observatory Global Telescope network in about 3.6 yr from 2016, for understanding electromagnetic radiation mechanisms during its outbursts. As a result, we confirmed that five outbursts had detected in the epoch, and that three outbursts underwent the X-ray state transition across Low-Hard, In-Transition, and High-Soft state while remaining two outbursts stayed in the Low-Hard state. We found that the optical spectral energy distribution in the High-Soft state is consistent with a simplified irradiated disc model, and that the optical colour/magnitude variation can be explained by variations in the X-ray luminosity and the disc geometrical thickness.

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