Debris disc formation induced by planetary growth

Debris disc formation induced by planetary growth
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行星生长引起的碎片盘形成

DOI:
10.1093/mnras/stu1073
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发表时间:
2014
影响因子:
4.8
通讯作者:
T. Löhne
T. Löhne
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
H. Kobayashi;T. Löhne

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数百颗年龄超过1000万年的恒星被观测到有红外线过剩。这些观测结果可以用隐藏的微行星碰撞碎裂形成的尘埃颗粒来解释。这种尘埃状的小行星盘被称为碎片盘。在一个动态冷的星子盘中,星子的碰撞凝聚产生行星胚胎,然后搅动周围剩余的星子。因此,行星形成过程中产生的星子碰撞碎裂形成了一个碎片盘。我们的目标是通过数值模拟星子种群的凝聚和分裂来确定碎片盘中底层星子的属性。碎片盘的亮度和时间演化取决于星子盘的径向分布、内外边缘的位置、总质量和盘中星子的大小。我们发现,一个径向狭窄的星子盘是最有可能导致的碎片盘,可以解释的趋势,观察到的红外线过剩的碎片discsvvv周围的G型恒星,行星形成只发生在1亿年前。早期的碎片盘形成是由行星形成引起的,而后期的演化则是由已经形成的行星周围剩余星子的碰撞衰变所解释的。在G型恒星周围的小行星盘中,半径为100 km,Au为30的小行星最容易解释斯皮策太空望远镜24和70 μm的碎片盘通量。
Several hundred stars older than 10 million years have been observed to have infrared excesses. These observations are explained by dust grains formed by the collisional fragmentation of hidden planetesimals. Such dusty planetesimal discs are known as debris discs. In a dynamically cold planetesimal disc, collisional coagulation of planetesimals produces planetary embryos which then stir the surrounding leftover planetesimals. Thus, the collisional fragmentation of planetesimals that results from planet formation forms a debris disc. We aim to determine the properties of the underlying planetesimals in debris discs by numerically modelling the coagulation and fragmentation of planetesimal populations. The brightness and temporal evolution of debris discs depend on the radial distribution of planetesimal discs, the location of their inner and outer edges, their total mass, and the size of planetesimals in the disc. We find that a radially narrow planetesimal disc is most likely to result in a debris disc that can explain the trend of observed infrared excesses of debris discsvvv around G-type stars, for which planet formation occurs only before 100 million years. Early debris disc formation is induced by planet formation, while the later evolution is explained by the collisional decay of leftover planetesimals around planets that have already formed. Planetesimal discs with underlying planetesimals of radii ∼100 km at ≈30 au most readily explain theSpitzer Space Telescope24 and 70 μm fluxes from debris discs around G-type stars.
行星系统的形成和演化(FEPS):发现与 HD 12039 相关的不寻常碎片系统
DOI: 10.1086/498929
发表时间: 2005
期刊: The Astrophysical Journal
影响因子: --
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D. Hines;D. Backman;J. Bouwman;L. Hillenbrand;J. Carpenter;M. Meyer;J. Kim;M. Silverstone;J. Rodmann;S. Wolf;E. Mamajek;T. Brooke;D. Padgett;T. Henning;A. Moro;E. Stobie;K. Gordon;J. Morrison;J. Muzerolle;K. Su
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碎片盘是自搅拌的吗?
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发表时间: 2010
影响因子: 4.8
作者:
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DOI: 10.1086/379854
发表时间: 2003
期刊: The Astronomical Journal
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“行星系统的形成和演化”斯皮策类太阳恒星遗产巡天中对 70 微米明亮碎片盘的完整普查
DOI: --
发表时间: 2007
期刊:
影响因子: --
作者:
L. Hillenbrand;J. Carpenter;J. Kim;M. Meyer;D. Backman;A. Moro;D. Hollenbach;D. Hines;I. Pascucci;J. Bouwman
通讯作者: J. Bouwman
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