The galactic rate of second- and third-generation disc and planet formation

The galactic rate of second- and third-generation disc and planet formation
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银河系第二代和第三代盘和行星形成的速率

DOI:
10.1093/mnras/sty1756
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发表时间:
2018
影响因子:
4.8
通讯作者:
Hogg M
Hogg M
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hogg M

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我们调查的形成光盘内的二元系统中,至少有一个组件已经离开了主序列。特别是,我们计算系统的发生率,可以主机长寿,大规模的磁盘,可能能够支持行星的形成。我们根据银河系的性质合成了一个种群,使用理论和观测输入来约束关键属性,例如初始质量函数的形状,二进制分数和传质物理。我们预测0.26%的二进制系统将托管第二代光盘(其中主要的进化),0.13%的系统将托管第三代光盘(其中次要的也进化)。对于银河系来说,这分别转化为1.3亿和9000万个第二代和第三代系统,估计总共有500亿个双星系统。在这些形成圆盘的系统中,我们估计大约20%的第二代圆盘和3.8%的第三代圆盘有足够的质量形成行星系统。我们推测如何行星形成的过程中不同的这些系统从传统的行星形成的原恒星盘。
We investigate the formation of discs within binary systems where at least one component has left the main sequence. In particular, we calculate the occurrence rates of systems that can host long-lived, massive discs that may be able to support the formation of planets. We synthesize a population based on Milky Way properties, using both theoretical and observational inputs to constrain key properties, such as the shape of the initial mass function, binary fraction, and mass-transfer physics. We predict 0.26 per cent of binary systems will host second-generation discs (where the primary has evolved), and 0.13 per cent of systems will host third-generation discs (where the secondary also evolves). For the Milky Way, this translates into 130 million and 90 million second- and third-generation systems, respectively, from an estimated total of 50 billion binary systems. Of these systems that form discs, we estimate approximately 20 per cent of second-generation and 3.8 per cent of third-generation discs have enough mass to form a planetary system. We speculate on how the process of planet formation differs in these systems from conventional planet formation in protostellar discs.
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