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Dynamical evolution and stability maps of the Proxima Centauri system
Meng, Tong1,2; Ji, Jianghui1; Dong, Yao1
2019
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume482Issue:1Pages:372-383
Corresponding AuthorJi, Jianghui(jijh@pmo.ac.cn)
AbstractProxima Centauri was recently discovered to host an Earth-mass planet of Proxima b, and a 215-d signal which is probably a potential planet c. In this work, we investigate the dynamical evolution of the Proxima Centauri system with the full equations of motion and semi-analytical models including relativistic and tidal effects. We adopt the modified Lagrange-Laplace secular equations to study the evolution of eccentricity of Proxima b, and find that the outcomes are consistent with those from the numerical simulations. The simulations show that relativistic effects have an influence on the evolution of eccentricities of planetary orbits, whereas tidal effects primarily affects the eccentricity of Proxima b over long time-scale. Moreover, using the MEGNO (the Mean Exponential Growth factor of Nearby Orbits) technique, we place dynamical constraints on orbital parameters that result in stable or quasi-periodic motions for coplanar and non-coplanar configurations. In the coplanar case, we find that the orbit of Proxima b is stable for the semi-major axis ranging from 0.02 au to 0.1 au and the eccentricity being less than 0.4. This is where the best-fitting parameters for Proxima b exactly fall. Additional simulations show that the robust stability of this system would favour an eccentricity of Proxima b less than 0.45 and that of Proxima c below 0.65. In the non-coplanar case, we find that mutual inclinations of two planets must be lower than 50A degrees in order to provide stability. Finally, we estimate the mass of Proxima c to be 3.13 M-aS center dot a parts per thousand 70.7 M-aS center dot, when 1.27 M-aS center dot a parts per thousand 1.6 M-aS center dot, if i(mutual) a parts per thousand> 50A degrees and Delta Omega = 0A degrees.
Keywordmethods: numerical celestial mechanics planets and satellites: dynamical evolution and stability stars: individual: Proxima Centauri
DOI10.1093/mnras/sty2682
WOS KeywordTIDAL EVOLUTION ; PLANETARY SYSTEM ; GLOBAL DYNAMICS ; HABITABLE ZONES ; MOTION ; CIRCULARIZATION ; MIGRATION ; ORBIT ; MASS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000454575300029
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/20503
Collection中国科学院紫金山天文台
Corresponding AuthorJi, Jianghui
Affiliation1.Chinese Acad Sci, CAS Key Lab Planetary Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Meng, Tong,Ji, Jianghui,Dong, Yao. Dynamical evolution and stability maps of the Proxima Centauri system[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,482(1):372-383.
APA Meng, Tong,Ji, Jianghui,&Dong, Yao.(2019).Dynamical evolution and stability maps of the Proxima Centauri system.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,482(1),372-383.
MLA Meng, Tong,et al."Dynamical evolution and stability maps of the Proxima Centauri system".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 482.1(2019):372-383.
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