CONFIGURATIONS OF BOUNDED AND FREE-FLOATING PLANETS IN VERY YOUNG OPEN CLUSTERS

CONFIGURATIONS OF BOUNDED AND FREE-FLOATING PLANETS IN VERY YOUNG OPEN CLUSTERS
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非常年轻的疏散星团中有界和自由漂浮的行星的结构

DOI:
10.1088/0004-637x/772/2/142
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发表时间:
2013-07
影响因子:
4.9
通讯作者:
Zhou, Ji-Lin
Zhou, Ji-Lin
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Liu, Hui-Gen;Zhang, Hui;Zhou, Ji-Lin

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疏散星团通常是年轻的,适合研究行星系统的形成和演化。到目前为止,只有四颗行星被发现在oc中进行了径向速度测量。与此同时,许多自由漂浮行星(FFPs)也被发现。我们利用n体模拟来研究年龄<10 Myr的非常年轻的疏散星团中多行星系统的演化和最终结构。在10迈尔的演化之后,61%-72%的行星仍然有边界,超过55%的行星系统将保持其初始轨道配置。对于有一颗行星被弹射的系统,其中超过25%的幸存行星的轨道不一致。在星团中,不对准的行星系统占6%,只有1%的行星在逆行轨道上运行。我们还得到了幸存行星数与离星团中心的距离r之间的正相关关系:r越大的行星系统越稳定。此外,质量为>2.5 M☉的恒星很可能是不稳定的,并且会失去它们的行星。这些结果与目前的观察结果大致一致。双星中的行星系统不太稳定,我们得到了一个粗略的标准:大多数双星系统都有$?100 AU可以保留所有的初始行星。最后,80%的ffp被驱逐出集群,而其余的(~ 20%)仍然留在主机集群中,其中大多数集中在中心(< 2%)。
Open clusters (OCs) are usually young and suitable for studying the formation and evolution of planetary systems. So far, only four planets have been found with radial velocity measurements in OCs. Meanwhile, a lot of free-floating planets (FFPs) have been detected. We utilize N-body simulations to investigate the evolution and final configurations of multi-planetary systems in very young open clusters with an age <10 Myr. After an evolution of 10 Myr, 61%–72% of the planets remain bounded and more than 55% of the planetary systems will maintain their initial orbital configurations. For systems with one planet ejected, more than 25% of them have the surviving planets in misaligned orbits. In the clusters, the fraction of planetary systems with misalignment is >6%, and only 1% have planets in retrograde orbits. We also obtain a positive correlation between the survival planet number and the distance from the cluster center r: planetary systems with a larger r tend to be more stable. Moreover, stars with a mass >2.5 M☉ are likely unstable and lose their planets. These results are roughly consistent with current observations. Planetary systems in binaries are less stable and we achieve a rough criterion: most of the binary systems with $?>100 AU can retain all the initial planets. Finally, 80% of the FFPs are ejected out of the clusters, while the rest (∼20%) still stay in host clusters and most of them are concentrated in the center (<2 pc).
DOI: 10.1038/nature10092
发表时间: 2011-05
期刊: Nature
影响因子: 64.8
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发表时间: 2002-01
期刊: Science
影响因子: 56.9
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DOI: 10.1111/j.1365-2966.2011.19911.x
发表时间: 2011-09
影响因子: 4.8
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DOI: 10.1086/516746
发表时间: 2007-02
期刊: The Astrophysical Journal
影响因子: --
作者:
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DOI: 10.1086/519918
发表时间: 2007-05
期刊: The Astrophysical Journal
影响因子: --
作者:
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