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The first low-mass eclipsing binary within the fully convective zone from TMTS

文献类型：期刊论文

作者Liu, Cheng9; Wang, Xiaofeng1,8,9; Zhang, Xiaobing7; Kovalev, Mikhail6; Lin, Jie1,5,8; Xi, Gaobo1,8; Mo, Jun1,8; Li, Gaici1,8; Peng, Haowei1,8; Li, Xin9
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2024-05-13
卷号531期号:1页码:1765-1775
关键词binaries: eclipsing binaries: spectroscopic stars: individual: TMTSJ0803 stars: low-mass
ISSN号0035-8711
DOI10.1093/mnras/stae1266
产权排序6
英文摘要We present a comprehensive photometric and spectroscopic analysis of the short-period (similar to 5.32 h) and low-mass eclipsing binary TMTSJ0803 discovered by Tsinghua-Ma Huateng Telescope for Survey (TMTS). By fitting the light curves and radial velocity data with the Wilson-Devinney code, we find that the binary is composed of two late spotted active M dwarfs below the fully convective boundary. This is supported by the discovery of a significant Balmer emission lines in the LAMOST spectrum and prominent coronal X-ray emission. In comparison with the typical luminosity of rapidly rotating fully convective stars, the much brighter X-ray luminosity (L-X/L-bol = 0.0159 +/- 0.0059) suggests the stellar magnetic activity of fully convective stars could be enhanced in such a close binary system. Given the metallicity of [M/H] = - 0.35 dex as inferred from the LAMOST spectrum, we measure the masses and radii of both stars to be M-1 = 0.169 +/- 0.010 M-circle dot, M-2 = 0.162 +/- 0.016 M-circle dot, R-1 = 0.170 +/- 0.006 R-circle dot, and R-2 = 0.156 +/- 0.006 R-circle dot, respectively. Based on the luminosity ratio from the light-curve modelling, the effective temperatures of two components are also estimated. In comparison with the stellar evolution models, the radii, and effective temperatures of two components are all below the isochrones. The radius deflation might be mainly biased by a small radial velocity (RV) data or (and) a simple correction on RVs, while the discrepancy in effective temperature might be due to the enhanced magnetic activity in this binary.
WOS关键词M-DWARF BINARY ; EVOLUTIONARY MODELS ; MAIN-SEQUENCE ; EBLM PROJECT ; LIGHT CURVES ; DATA RELEASE ; STAR LIGHT ; DARKENING COEFFICIENTS ; ABSOLUTE DIMENSIONS ; CHEMICAL ABUNDANCES
资助项目National Natural Science Foundation of China[12033003] ; National Natural Science Foundation of China[12288102] ; National Natural Science Foundation of China[12203006] ; National Natural Science Foundation of China[1242016] ; Beijing Natural Science Foundation[BS202002] ; Beijing Natural Science Foundation[24CE-YS-08] ; Beijing Natural Science Foundation[23CB061] ; Beijing Natural Science Foundation[23CB059] ; Science Program[24CD012] ; Popular Science Project ; Beijing Academy of Science and Technology ; Tencent Xplorer Prize - 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:001231710600010
出版者OXFORD UNIV PRESS
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Beijing Natural Science Foundation ; Science Program ; Popular Science Project ; Beijing Academy of Science and Technology ; Tencent Xplorer Prize - National Development and Reform Commission ; Chinese Academy of Sciences
源URL[http://ir.xao.ac.cn/handle/45760611-7/6760]  
专题光学天文与技术应用研究室_变星研究团组
通讯作者Liu, Cheng; Wang, Xiaofeng; Zhang, Xiaobing
作者单位1.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China
2.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
3.China Three Gorges Univ, Ctr Astron & Space Sci, Yichang 443000, Peoples R China
4.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Xinjiang, Peoples R China
5.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China
6.Chinese Acad Sci, Yunnan Observ, Kunming 650216, Peoples R China
7.Chinese Acad Sci, CAS Key Lab Opt Astron, Natl Astron Observ, Beijing 100101, Peoples R China
8.Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China
9.Beijing Planetarium, Dept Sci Res, Beijing 100044, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Cheng,Wang, Xiaofeng,Zhang, Xiaobing,et al. The first low-mass eclipsing binary within the fully convective zone from TMTS[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2024,531(1):1765-1775.
APA Liu, Cheng.,Wang, Xiaofeng.,Zhang, Xiaobing.,Kovalev, Mikhail.,Lin, Jie.,...&Zhang, Jicheng.(2024).The first low-mass eclipsing binary within the fully convective zone from TMTS.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,531(1),1765-1775.
MLA Liu, Cheng,et al."The first low-mass eclipsing binary within the fully convective zone from TMTS".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 531.1(2024):1765-1775.

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