The expansion of debris flow shed from the primary of 65803 Didymos
The expansion of debris flow shed from the primary of 65803 Didymos
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65803 Didymos 初级泥石流棚扩建
DOI：
10.1093/mnras/sty3515
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发表时间：
2018-12
影响因子：
4.8
通讯作者：
Richardson D.
中科院分区：
文献类型：
--
作者：
Yu Y.;Michel P.;Hirabayashi M.;Richardson D.
本文研究了近地双星小行星65803 Didymos的主小行星Didymos A表面的可能质量脱落，以及脱落碎片随后的轨道演化。脱落条件是半解析推导的。结合SSDEM模拟的分析和数值结果，确定了Didymos A的不稳定表面区域。我们发现，基于观测的模型给出了一个高度不稳定的表面Didymos A。特别是，大部分的赤道脊是不可附着的无粘性风化层，和一个活跃的区域出现沿着脊，其中广泛的雪崩，导致表面质量脱落似乎可能发生。我们跟踪从不稳定区域脱落碎片的弹道运动。长达一个月的模拟显示了不同尺寸的样品粒子的不同演变，由于太阳辐射压力的变化幅度。关于脱落碎片的动力学命运的统计数据为这一双星系统的当前发展提供了线索。根据基于观测的参考模型，我们发现绝大多数脱落质量最终转移到Didymos B，从而导致累积增长。累积的质量可能导致Didymos B的螺旋运动，螺旋运动的速度取决于质量脱落的频率和大小。还注意到质量脱落/转移的地形依赖性，累积质量主要源自脊区域的高度升高的区域。长期来看，脱落过程倾向于先侵蚀隆凸，迫使赤道高压脊演变成较好的圆度。
This paper investigates the plausible mass shedding from the surface of Didymos A, the primary of Near-Earth binary asteroid 65803 Didymos, and the subsequent orbital evolution of the shedding debris. Shedding conditions are derived semi-analytically. The unstable surface area on Didymos A is determined by combining the analyses and numeric results of SSDEM simulations. We show the observation-based model gives a highly unstable surface for Didymos A. In particular, most of the equatorial ridge is unattachable for cohesionless regolith, and an active region emerges along the ridge, in which extensive avalanches that cause surface mass shedding seem likely to happen. We track the ballistic motion of shedding debris from the unstable area. Month-long simulations show the diverse evolutions of sample particles with different sizes, due to the varying magnitude of solar radiation pressure. Statistics on the dynamical fates of shedding debris give clues on the current development of this binary system. Depending on the observation-based reference model, we find a vast majority of the shedding mass is finally transferred to Didymos B and thus leads to a cumulative growth. The cumulated mass may cause a spiralling-in motion of Didymos B, and the spiralling-in speed depends on the frequency and magnitude of mass shedding. A topography dependence of the mass shedding/transfer is also noticed that the cumulated mass mostly originates from highly elevated regions of the ridge areas. Long term it suggests that the shedding processes prefer to erode the bulges first and force the equatorial ridge to evolve into good roundness.
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DOI：
10.1086/516572
发表时间：
2007-03
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
M. Ćuk
通讯作者：
M. Ćuk
接近临界自旋极限的顶形小行星表面质量脱落的动力学复杂性
DOI：
10.3847/1538-3881/aaccf7
发表时间：
2018-07
期刊：
The Astronomical Journal
影响因子：
--
作者：
Yu Y.;Michel P.;Hirabayashi M.;Schwartz S. R.;Zhang Y.;Richardson D. C.;Liu X.
通讯作者：
Liu X.
影响因子：
64.8
作者：
P. Pravec;D. Vokrouhlický;D. Polishook;D. Scheeres;A. Harris;A. Galád;Ovidiu Vaduvescu;F. Pozo Nuñez;A. Barr;P. Longa;F. Vachier;F. Colas;D. Pray;J. Pollock;D. Reichart;K. Ivarsen;J. Haislip;A. Lacluyze;P. Kušnirák;T. Henych;F. Marchis;B. Macomber;Seth Andrew Jacobson;Y. Krugly;A. V. Sergeev;A. Leroy
通讯作者：
P. Pravec;D. Vokrouhlický;D. Polishook;D. Scheeres;A. Harris;A. Galád;Ovidiu Vaduvescu;F. Pozo Nuñez;A. Barr;P. Longa;F. Vachier;F. Colas;D. Pray;J. Pollock;D. Reichart;K. Ivarsen;J. Haislip;A. Lacluyze;P. Kušnirák;T. Henych;F. Marchis;B. Macomber;Seth Andrew Jacobson;Y. Krugly;A. V. Sergeev;A. Leroy
DOI：
--
发表时间：
2010-10
期刊：
--
影响因子：
--
作者：
L. Benner;J. Margot;M. Nolan;J. Giorgini;M. Brozović;D. Scheeres;C. Magri;S. Ostro
通讯作者：
L. Benner;J. Margot;M. Nolan;J. Giorgini;M. Brozović;D. Scheeres;C. Magri;S. Ostro
拟议 AIDA 任务目标 65803 Didymos 的蠕变稳定性：I. 离散无粘聚颗粒物理模型
影响因子：
3.2
作者：
Zhang Yun;Richardson Derek C;Barnouin Olivier S;Maurel Clara;Michel Patrick;Schwartz Stephen R;Ballouz Ronald Louis;Benner Lance A M;Naidu Shantanu P;Li Junfeng
通讯作者：
Li Junfeng