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
复制标题
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
中科院分区:
文献类型:
--
作者:
M. Fouchard;H. Rickman;C. Froeschlé;G. Valsecchi
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.
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