A study of the high-inclination population in the Kuiper belt - I. The Plutinos
A study of the high-inclination population in the Kuiper belt - I. The Plutinos
复制标题
柯伊伯带高倾角星体的研究——一、冥王星
DOI：
10.1093/mnras/stt1872
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发表时间：
2014
影响因子：
4.8
通讯作者：
Sun Yi-Sui
中科院分区：
文献类型：
--
作者：
Li Jian;Zhou Li-Yong;Sun Yi-Sui
The dynamics of the high-inclination Plutinos is systematically studied. We first present the peculiar features of the 2:3 Neptune mean motion resonance (NMMR) for inclined orbits, especially for the correlation of resonant amplitudeAσwith inclinationi. Using the numerical integrations for the age of the Solar system, the dynamical structure of the 2:3 NMMR is mapped out on the plane of semimajor axis versusifor different eccentricities. We have shown thatiof stable resonant orbits could be as high as 90°; and the stable region is roughly surrounded by the contours ofAσ= 120°. These new findings allow us to further explore the 2:3 NMMR capture and retention of planetesimals with initial inclinationsi0≤ 90° in the frame of the planet migration model. We find that the outward transportation of Plutinos is possible for any inclined or even perpendicular orbits. The role ofi0in the formation of Plutinos during Neptune's migration is highlighted and interesting results are obtained: (1) the capture efficiency of the 2:3 NMMR decreases drastically first with the increase ofi0, but it then raises instead wheni0exceeds ∼50°; (2) the magnitude ofi-variation is limited to less than 5° for anyi0, and moreover, for Plutinos withi≳ 48°, theiriare forced to decrease throughout the outward migration; (3) Plutinos withi≳ 48° are certainly outside the Kozai mechanism, since an inclination increase is prohibited by the migrating 2:3 NMMR; (4) the 7:11 inclination-type NMMR could be responsible for nearly circular Plutinos, and a minimumi0∼ 15° is required to intrigue this mechanism.
