The origin of long-lived asteroids in the 2:1 mean-motion resonance with Jupiter

被引:10
作者
Chrenko, O. [1 ]
Broz, M. [1 ]
Nesvorny, D. [2 ]
Tsiganis, K. [3 ]
Skoulidou, D. K. [3 ]
机构
[1] Charles Univ Prague, Inst Astron, CZ-18000 Prague 8, Czech Republic
[2] Southwest Res Inst, Dept Space Studies, Boulder, CO 80302 USA
[3] Aristotle Univ Thessaloniki, Dept Phys, GR-54124 Thessaloniki, Greece
关键词
methods: numerical; minor planets; asteroids:; general; LATE HEAVY BOMBARDMENT; HECUBA GAP; SECULAR RESONANCES; SIZE DISTRIBUTIONS; CHAOTIC DIFFUSION; SOLAR-SYSTEM; BELT; FAMILIES; DYNAMICS; SIMULATIONS;
D O I
10.1093/mnras/stv1109
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The 2:1 mean-motion resonance with Jupiter harbours two distinct groups of asteroids. The short-lived population is known to be a transient group sustained in steady state by the Yarkovsky semimajor axis drift. The long-lived asteroids, however, can exhibit dynamical lifetimes comparable to 4 Gyr. They reside near two isolated islands of the phase space denoted A and B, with an uneven population ratio B/A similar or equal to 10. The orbits of A-island asteroids are predominantly highly inclined, compared to island B. The size-frequency distribution is steep but the orbital distribution lacks any evidence of a collisional cluster. These observational constraints are somewhat puzzling and therefore the origin of the long-lived asteroids has not been explained so far. With the aim to provide a viable explanation, we first update the resonant population and revisit its physical properties. Using anN-body model with seven planets and the Yarkovsky effect included, we demonstrate that the dynamical depletion of island A is faster, in comparison with island B. Then we investigate (i) the survivability of primordial resonant asteroids and (ii) capture of the population during planetary migration, following a recently described scenario with an escaping fifth giant planet and a jumping-Jupiter instability. We also model the collisional evolution of the resonant population over past 4 Gyr. Our conclusion is that the long-lived group was created by resonant capture from a narrow part of hypothetical outer main-belt family during planetary migration. Primordial asteroids surviving the migration were probably not numerous enough to substantially contribute to the observed population.
引用
收藏
页码:2399 / 2416
页数:18
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