PLANET FORMATION IN CIRCUMBINARY CONFIGURATIONS: TURBULENCE INHIBITS PLANETESIMAL ACCRETION

PLANET FORMATION IN CIRCUMBINARY CONFIGURATIONS: TURBULENCE INHIBITS PLANETESIMAL ACCRETION
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圆形结构中的行星形成:湍流抑制星体吸积

DOI:
10.1088/2041-8205/761/1/l7
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发表时间:
2012
期刊:
The Astrophysical Journal Letters
影响因子:
--
通讯作者:
S. Meschiari
S. Meschiari
中科院分区:
--
文献类型:
--
作者:
S. Meschiari

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在被恒星伴星高度扰动的环境中诞生的行星的存在,是对行星形成范式的重大挑战。在数值模拟中,一个亲密的双星伴星的存在会激起小行星之间的相对速度,这是决定吸积和侵蚀之间平衡的基础。然而,开普勒最近发现的环行双星证实,在双星系统中形成行星显然是可行的。我们对嵌入在原行星盘中的小行星进行了N体模拟,其中小行星的位相因随机力矩的存在而受挫,模拟了由磁致旋转不稳定性驱动的预期湍流扰动。我们研究了与中面死区相关的微扰幅度(有利于单星中行星的形成),发现即使在远离中心双星的外盘(4-10AU)也可以抑制行星微小的吸积,这个位置以前被认为是形成外双星行星的合理起点。
The existence of planets born in environments highly perturbed by a stellar companion represents a major challenge to the paradigm of planet formation. In numerical simulations, the presence of a close binary companion stirs up the relative velocity between planetesimals, which is fundamental in determining the balance between accretion and erosion. However, the recent discovery of circumbinary planets by Kepler establishes that planet formation in binary systems is clearly viable. We perform N-body simulations of planetesimals embedded in a protoplanetary disk, where planetesimal phasing is frustrated by the presence of stochastic torques, modeling the expected perturbations of turbulence driven by the magnetorotational instability. We examine perturbation amplitudes relevant to dead zones in the midplane (conducive to planet formation in single stars), and find that planetesimal accretion can be inhibited even in the outer disk (4–10 AU) far from the central binary, a location previously thought to be a plausible starting point for the formation of circumbinary planets.
DOI: 10.1088/0004-637x/691/2/l133
发表时间: 2009-02
期刊: The Astrophysical Journal
影响因子: --
作者:
S. Stewart;Z. Leinhardt
通讯作者: S. Stewart;Z. Leinhardt
DOI: 10.1088/2041-8205/754/1/l16
发表时间: 2012-06
期刊: The Astrophysical Journal Letters
影响因子: --
作者:
S. Paardekooper;Z. Leinhardt;P. Thebault;C. Baruteau
通讯作者: S. Paardekooper;Z. Leinhardt;P. Thebault;C. Baruteau