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Stability of multiplanetary systems in star clusters

文献类型：期刊论文

作者Spurzem, Rainer1,2,5; Zwart, Simon F. Portegies3; Kouwenhoven, M. B. N.4,5; Cai, Maxwell Xu1,3,5
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2017-10-01
卷号470期号:4页码:4337-4353
关键词Methods: Numerical Planets And Satellites: Dynamical Evolution And Stability Planets And Satellites: Formation Galaxies: Star Clusters: General
DOI10.1093/mnras/stx1464
文献子类Article
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.
WOS关键词FREE-FLOATING PLANETS ; N-BODY SIMULATIONS ; DYNAMICAL INTERACTIONS ; CIRCUMSTELLAR DISKS ; STELLAR CLUSTERS ; GLOBULAR-CLUSTERS ; GIANT PLANETS ; SOLAR-SYSTEM ; HOT JUPITERS ; ORION NEBULA
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000408207600041
资助机构National Astronomical Observatories of Chinese Academy of Sciences through 'Qianren' (Thousand Talents) programme of People's Republic of China ; 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) ; German Science Foundation (DFG) through University of Heidelberg(7.1.47) ; Ministry of Finance of People's Republic of China(ZDYZ2008-2) ; Ministry of Finance of People's Republic of China(ZDYZ2008-2) ; National Natural Science Foundation of China(11010237 ; National Natural Science Foundation of China(11010237 ; Xi'an Jiaotong-Liverpool University (XJTLU)(RDF-16-01-16) ; Xi'an Jiaotong-Liverpool University (XJTLU)(RDF-16-01-16) ; Netherlands Research Council NWO(643.200.503 ; Netherlands Research Council NWO(643.200.503 ; Netherlands Research School for Astronomy (NOVA) ; Netherlands Research School for Astronomy (NOVA) ; Interuniversity Attraction Poles Programme(IAP P7/08) ; Interuniversity Attraction Poles Programme(IAP P7/08) ; European Union's Horizon research and innovation programme(671564) ; European Union's Horizon research and innovation programme(671564) ; 11050110414 ; 11050110414 ; 639.073.803 ; 639.073.803 ; 11173004 ; 11173004 ; 614.061.608) ; 614.061.608) ; 11573004) ; 11573004) ; National Astronomical Observatories of Chinese Academy of Sciences through 'Qianren' (Thousand Talents) programme of People's Republic of China ; 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) ; German Science Foundation (DFG) through University of Heidelberg(7.1.47) ; Ministry of Finance of People's Republic of China(ZDYZ2008-2) ; Ministry of Finance of People's Republic of China(ZDYZ2008-2) ; National Natural Science Foundation of China(11010237 ; National Natural Science Foundation of China(11010237 ; Xi'an Jiaotong-Liverpool University (XJTLU)(RDF-16-01-16) ; Xi'an Jiaotong-Liverpool University (XJTLU)(RDF-16-01-16) ; Netherlands Research Council NWO(643.200.503 ; Netherlands Research Council NWO(643.200.503 ; Netherlands Research School for Astronomy (NOVA) ; Netherlands Research School for Astronomy (NOVA) ; Interuniversity Attraction Poles Programme(IAP P7/08) ; Interuniversity Attraction Poles Programme(IAP P7/08) ; European Union's Horizon research and innovation programme(671564) ; European Union's Horizon research and innovation programme(671564) ; 11050110414 ; 11050110414 ; 639.073.803 ; 639.073.803 ; 11173004 ; 11173004 ; 614.061.608) ; 614.061.608) ; 11573004) ; 11573004)
源URL[http://ir.bao.ac.cn/handle/114a11/20147]  
专题国家天文台_星系宇宙学研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
2.Heidelberg Univ, Astron Rechen Inst, Zentrum Astron, Monchhofstr 12, D-69120 Heidelberg, Germany
3.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands
4.Xian Jiaotong Liverpool Univ XJTLU, Dept Math Sci, 111 Renai Rd,Suzhou Ind Pk, Suzhou 215123, Peoples R China
5.Peking Univ, Kavli Inst Astron & Astrophys, 5 Yi He Yuan Rd, Beijing 100871, Peoples R China
推荐引用方式
GB/T 7714		 Spurzem, Rainer,Zwart, Simon F. Portegies,Kouwenhoven, M. B. N.,et al. Stability of multiplanetary systems in star clusters[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,470(4):4337-4353.
APA Spurzem, Rainer,Zwart, Simon F. Portegies,Kouwenhoven, M. B. N.,&Cai, Maxwell Xu.(2017).Stability of multiplanetary systems in star clusters.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,470(4),4337-4353.
MLA Spurzem, Rainer,et al."Stability of multiplanetary systems in star clusters".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 470.4(2017):4337-4353.

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