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Enhanced magnetic activity in rapidly rotating binary stars

文献类型：期刊论文

作者Yu, Jie1,2,3,4; Gehan, Charlotte4; Hekker, Saskia3,5; Bazot, Michäel3; Cameron, Robert H.4; Gaulme, Patrick6; Bedding, Timothy R.7; Murphy, Simon J.8; Han ZW(韩占文)9,10; Ting, Yuan-Sen11,12
刊名NATURE ASTRONOMY
出版日期2025
ISSN号2397-3366
DOI10.1038/s41550-025-02562-2
产权排序第9完成单位
文献子类Article; Early Access
英文摘要Stellar activity is fundamental to stellar evolution and the formation and habitability of exoplanets. Magnetic surface activity is driven by the interaction between convective motions and rotation in cool stars, resulting in a dynamo process. In single stars, activity increases with rotation rate until it saturates for stars with rotation periods P-rot < 3-10 d. However, the mechanism responsible for saturation remains unclear. Observations indicate that red giants in binary systems that are in spin-orbit resonance exhibit stronger chromospheric activity than single stars with similar rotation rates, suggesting that tidal flows can influence surface activity. Here, we investigate the chromospheric activity of main-sequence binary stars to understand the impact of tidal forces on saturation phenomena. For binaries with 0.5 < P-rot (d) < 1, mainly contact binaries that share a common thermal envelope, we find enhanced activity rather than saturation. This result supports theoretical predictions that a large-scale alpha-omega dynamo during common-envelope evolution can generate strong magnetic fields. We also observe supersaturation in chromospheric activity, a phenomenon tentatively noted previously in coronal activity, where activity levels fall below saturation and decrease with shorter rotation periods. Our findings emphasize the importance of studying stellar activity in stars with extreme properties compared with the Sun's.
学科主题天文学 ; 恒星与银河系
URL标识查看原文
出版地HEIDELBERGER PLATZ 3, BERLIN, 14197, GERMANY
WOS关键词CHROMOSPHERIC ACTIVITY ; STELLAR ACTIVITY ; TIDAL EVOLUTION ; WHITE-DWARFS ; CIRCULARIZATION ; CATALOG ; MASS
资助项目ERC Synergy Grant WHOLE SUN 810218 PLATO grants from the German Aerospace Center (DLR 50OO1501) and from the Max Planck Society ERC Consolidator Grant DipolarSound (grant agreement \# 101000296) Joint Research Fund in Astronomy (U2031203) under a cooperati[WHOLE SUN 810218]; ERC Synergy Grant WHOLE SUN 810218 PLATO grants from the German Aerospace Center (DLR 50OO1501) and from the Max Planck Society ERC Consolidator Grant DipolarSound (grant agreement \# 101000296) Joint Research Fund in Astronomy (U2031203) under a cooperati[DLR 50OO1501]; ERC Synergy; Max Planck Society[101000296]; ERC Consolidator Grant DipolarSound[12288102]; Natural Science Foundation of China[DE220101520]; Australian Research Council through DECRA Fellowship[AST-2009713]; Australian Research Council through DECRA Fellowship[AST-2319326]; Australian Research Council through DECRA Fellowship[U2031203]; US National Science Foundation; National Natural Science Foundation of China (NSFC); Chinese Academy of Sciences (CAS); Guoshoujing Telescope (LAMOST); National Major Scientific Project built by the Chinese Academy of Sciences; National Development and Reform Commission; Chinese Academy of Sciences
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001494279300001
出版者NATURE PORTFOLIO
资助机构ERC Synergy Grant WHOLE SUN 810218 PLATO grants from the German Aerospace Center (DLR 50OO1501) and from the Max Planck Society ERC Consolidator Grant DipolarSound (grant agreement \# 101000296) Joint Research Fund in Astronomy (U2031203) under a cooperati[WHOLE SUN 810218, DLR 50OO1501] ; ERC Synergy ; Max Planck Society[101000296] ; ERC Consolidator Grant DipolarSound[12288102] ; Natural Science Foundation of China[DE220101520] ; Australian Research Council through DECRA Fellowship[AST-2009713, AST-2319326, U2031203] ; US National Science Foundation ; National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences (CAS) ; Guoshoujing Telescope (LAMOST) ; National Major Scientific Project built by the Chinese Academy of Sciences ; National Development and Reform Commission ; Chinese Academy of Sciences
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28316]  
专题云南天文台_大样本恒星演化研究组
作者单位1.School of Computing, Australian National University, Canberra, Australia;
2.Research School of Astronomy & Astrophysics, Australian National University, Canberra, Australia;
3.Heidelberg Institute for Theoretical Studies (HITS) gGmbH, Heidelberg, Germany;
4.Max-Planck-Institut für Sonnensystemforschung, Göttingen, Germany;
5.Centre for Astronomy (ZAH/LSW), Heidelberg University, Heidelberg, Germany;
6.Thüringer Landessternwarte, Tautenburg, Germany;
7.Sydney Institute for Astronomy, School of Physics, University of Sydney, Sydney, Australia;
8.Centre for Astrophysics, University of Southern Queensland, Toowoomba, Australia;
9.Yunnan Observatories, Chinese Academy of Sciences, Kunming, China;
10.International Centre of Supernovae, Yunnan Key Laboratory, Kunming, China;
推荐引用方式
GB/T 7714		 Yu, Jie,Gehan, Charlotte,Hekker, Saskia,et al. Enhanced magnetic activity in rapidly rotating binary stars[J]. NATURE ASTRONOMY,2025.
APA Yu, Jie.,Gehan, Charlotte.,Hekker, Saskia.,Bazot, Michäel.,Cameron, Robert H..,...&Bi, Shaolan.(2025).Enhanced magnetic activity in rapidly rotating binary stars.NATURE ASTRONOMY.
MLA Yu, Jie,et al."Enhanced magnetic activity in rapidly rotating binary stars".NATURE ASTRONOMY (2025).

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