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Evidence for enhanced mass transfer in the disc preceding the transition to the soft state in MAXI J1820+070

文献类型：期刊论文

作者Yang, Pengcheng8; Zhang GB(张国宝)6,7; Russell, David M.5; Méndez, Mariano8; Baglio, Maria Cristina4; Altamirano, Diego3; Yang, Yi-Jung1,2; Saikia, Payaswini5; Alabarta, Kevin5
刊名Astronomy and Astrophysics
出版日期2025-08-01
卷号700
关键词accretion accretion disks stars: black holes X rays: binaries X rays: individuals: MAXI J1820+070
ISSN号0004-6361
DOI10.1051/0004-6361/202555089
产权排序第2完成单位
文献子类Journal article (JA)
英文摘要We investigate the 2018-2019 main outburst and the subsequent mini-outbursts of the black hole low-mass X-ray binary MAXI J1820+070 using optical/ultraviolet data from the Las Cumbres Observatory (LCO), the American Association of Variable Star Observers (AAVSO), and Swift/UVOT, as well as X-ray data from Insight-HXMT and Swift/XRT. Given the high-cadence observations, we identify a broad dip-like feature in both the optical and X-ray light curves preceding the transition to the soft state, with the X-ray dip lagging the optical dip by approximately 10 days. We propose that the dip is caused by a brief decrease followed by an increase in the mass accretion rate as it propagates through the disc, ultimately triggering the transition to the soft state. This might be a potential tool to predict impending hard-to-soft state transitions, although such a dip has not yet been observed in many sources. Additionally, we find that the optical colour (g-i) becomes bluer and less variable before the transition to the intermediate state, preceding a dramatic change in the hardness ratio. This appears to be an unusual case, differing from the typical scenario in which the optical colour changes along with the transition to the soft state. Finally, we explore the implications of the complex evolution of optical/X-ray correlation during both main outbursts and mini-outbursts. In particular, we find a loop-like evolutionary track before the transition to the soft state, which is linked to optical/X-ray dips in the light curves. © The Authors 2025.
学科主题天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学
URL标识查看原文
资助项目N/A
语种英语
资助机构N/A
源URL[http://ir.ynao.ac.cn/handle/114a53/28503]  
专题星系类星体研究组
云南天文台_中国科学院天体结构与演化重点实验室
作者单位1.Laboratory for Space Research, The University of Hong Kong, Cyberport 4, Hong Kong
2.Graduate Institute of Astronomy, National Central University, 300 Zhongda Road, Zhongli, Taoyuan, 32001, Taiwan;
3.School of Physics and Astronomy, University of Southampton, Southampton, Hampshire, SO17 1BJ, United Kingdom;
4.Inaf, Osservatorio Astronomico di Brera, Via E. Bianchi 46, LC, Merate, I-23807, Italy;
5.Center for Astrophysics and Space Science (CASS), New York University Abu Dhabi, PO Box 129188, Abu Dhabi, United Arab Emirates;
6.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650216, China;
7.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650216, China;
8.Kapteyn Astronomical Institute, University of Groningen, PO Box 800, Groningen, NL-9700 AV, Netherlands;
推荐引用方式
GB/T 7714		 Yang, Pengcheng,Zhang GB,Russell, David M.,et al. Evidence for enhanced mass transfer in the disc preceding the transition to the soft state in MAXI J1820+070[J]. Astronomy and Astrophysics,2025,700.
APA Yang, Pengcheng.,张国宝.,Russell, David M..,Méndez, Mariano.,Baglio, Maria Cristina.,...&Alabarta, Kevin.(2025).Evidence for enhanced mass transfer in the disc preceding the transition to the soft state in MAXI J1820+070.Astronomy and Astrophysics,700.
MLA Yang, Pengcheng,et al."Evidence for enhanced mass transfer in the disc preceding the transition to the soft state in MAXI J1820+070".Astronomy and Astrophysics 700(2025).

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来源：云南天文台

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