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题名:
Stability of multiplanetary systems in star clusters
作者: Cai, Maxwell Xu1,3,4; Kouwenhoven, M. B. N.2,4; Zwart, Simon F. Portegies1; Spurzem Rainer3,4,5
关键词: methods: numerical ; planets and satellites: dynamical evolution and stability ; planets and satellites: formation ; galaxies: star clusters: general
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
发表日期: 2017-10-01
DOI: 10.1093/mnras/stx1464
卷: 470, 期:4, 页:4337-4353
文章类型: Article
收录类别: SCI
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: FREE-FLOATING PLANETS ; N-BODY SIMULATIONS ; DYNAMICAL INTERACTIONS ; CIRCUMSTELLAR DISKS ; STELLAR CLUSTERS ; GLOBULAR-CLUSTERS ; GIANT PLANETS ; SOLAR-SYSTEM ; HOT JUPITERS ; ORION NEBULA
英文摘要: Most stars form in star clusters and stellar associations. However, only about similar to 1 per cent of the presently known exoplanets are found in these environments. To understand the roles of star cluster environments in shaping the dynamical evolution of planetary systems, we carry out direct N-body simulations of four planetary system models in three different star cluster environments with respectively N = 2k, 8k and 32k stars. In each cluster, an ensemble of initially identical planetary systems are assigned to solar-type stars with similar to 1M(circle dot) and evolved for 50 Myr. We found that following the depletion of protoplanetary discs, external perturbations and planet-planet interactions are two driving mechanisms responsible for the destabilization of planetary systems. The planet survival rate varies from similar to 95 per cent in the N = 2k cluster to similar to 60 per cent in the N = 32k cluster, which suggests that most planetary systems can indeed survive in low-mass clusters, except in the central regions. We also find that planet ejections through stellar encounters are cumulative processes, as only similar to 3 per cent of encounters are strong enough to excite the eccentricity by Delta e >= 0.5. Short-period planets can be perturbed through orbit crossings with long-period planets. When taking into account planet-planet interactions, the planet ejection rate nearly doubles, and therefore multiplicity contributes to the vulnerability of planetary systems. In each ensemble, similar to 0.2 per cent of planetary orbits become retrograde due to random directions of stellar encounters. Our results predict that young low-mass star clusters are promising sites for next-generation planet surveys, yet low planet detection rates are expected in dense globular clusters such as 47 Tuc. Nevertheless, planets in denser stellar environments are likely to have shorter orbital periods, which enhance their detectability.
语种: 英语
项目资助者: National Astronomical Observatories of Chinese Academy of Sciences through 'Qianren' (Thousand Talents) programme of People's Republic of China ; German Science Foundation (DFG) through University of Heidelberg(7.1.47) ; Ministry of Finance of People's Republic of China(ZDYZ2008-2) ; National Natural Science Foundation of China(11010237 ; Xi'an Jiaotong-Liverpool University (XJTLU)(RDF-16-01-16) ; Netherlands Research Council NWO(643.200.503 ; Netherlands Research School for Astronomy (NOVA) ; Interuniversity Attraction Poles Programme(IAP P7/08) ; European Union's Horizon research and innovation programme(671564) ; 11050110414 ; 639.073.803 ; 11173004 ; 614.061.608) ; 11573004)
WOS记录号: WOS:000408207600041
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内容类型: 期刊论文
URI标识: http://ir.bao.ac.cn/handle/114a11/20147
Appears in Collections:星系宇宙学研究部_期刊论文

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作者单位: 1.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands
2.Xian Jiaotong Liverpool Univ XJTLU, Dept Math Sci, 111 Renai Rd,Suzhou Ind Pk, Suzhou 215123, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
4.Peking Univ, Kavli Inst Astron & Astrophys, 5 Yi He Yuan Rd, Beijing 100871, Peoples R China
5.Heidelberg Univ, Astron Rechen Inst, Zentrum Astron, Monchhofstr 12, D-69120 Heidelberg, Germany

Recommended Citation:
Cai, Maxwell Xu,Kouwenhoven, M. B. N.,Zwart, Simon F. Portegies,et al. Stability of multiplanetary systems in star clusters[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,470(4):4337-4353.
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