On the present shape of the Oort cloud and the flux of “new” comets

On the present shape of the Oort cloud and the flux of “new” comets
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关于奥尔特云目前的形状和“新”彗星的通量

DOI:
10.1016/j.icarus.2017.01.013
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发表时间:
2017
期刊:
影响因子:
3.2
通讯作者:
G. Valsecchi
G. Valsecchi
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
M. Fouchard;H. Rickman;C. Froeschlé;G. Valsecchi

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长期演化的一组初始的107奥尔特云彗星的年龄的太阳系考虑到通过恒星的行动使用10个不同的序列的恒星遭遇,银河系潮汐和重力的巨行星。初始条件是指一个圆盘状的奥尔特云前兆,集中在黄道与近日点在天王星和海王星的区域。我们的研究结果表明,奥尔特云的形状很快达到一种稳定状态超过半长轴大于约2000 Au(这个阈值取决于演化的时间跨度),与玻尔兹曼分布的轨道能量。这些恒星的作用方式与之前论文中发现的相反,即它们清空了初始潮汐活跃区,而该活跃区相对于各向同性的情况来说是过度填充的。因此,恒星扰动的包含强烈影响奥尔特峰的形状。相反,Oort尖峰的形状似乎对所使用的恒星序列的依赖性很差,而可观测彗星的总通量和尖峰内部逆行彗星的比例则显著依赖于它。奥尔特峰的形状和最终奥尔特云的形状几乎与所考虑的轨道能量的初始分布无关。
Long term evolution of an initial set of 107Oort cloud comets is performed for the age of the solar system taking into account the action of passing stars using 10 different sequences of stellar encounters, Galactic tides and the gravity of the giant planets. The initial conditions refer to a disk-shaped Oort cloud precursor, concentrated toward the ecliptic with perihelia in the region of Uranus and Neptune. Our results show that the shape of the Oort cloud quickly reach a kind of steady state beyond a semi-major axis greater than about 2000 AU (this threshold depending on the evolution time-span), with a Boltzmann distribution of the orbital energy. The stars act in an opposite way to what was found in previous papers, that is they emptied an initial Tidal Active Zone that is overfilled with respect to the isotropic case. Consequently, the inclusion of stellar perturbations strongly affect the shape of the Oort spike. On the contrary, the Oort spike shape appears to be poorly dependent on the stellar sequences used, whereas the total flux of observable comets and the proportion of retrograde comets for the inner part of the spike are significantly dependent of it. Then it has been highlighted that the total flux, the shape of the Oort spike and the shape of the final Oort cloud are almost independent of the initial distribution of orbital energy considered.
DOI: 10.1016/j.icarus.2013.03.012
发表时间: 2012-05
期刊: Icarus
影响因子: 3.2
作者:
R. Brasser;A. Morbidelli
通讯作者: R. Brasser;A. Morbidelli
DOI: --
发表时间: 2017
期刊:
影响因子: --
作者:
R. Brasser
通讯作者: R. Brasser
DOI: 10.1086/521815
发表时间: 2007-08
期刊: The Astronomical Journal
影响因子: --
作者:
A. Higuchi;E. Kokubo;H. Kinoshita;T. Mukai
通讯作者: A. Higuchi;E. Kokubo;H. Kinoshita;T. Mukai