Mars’ Formation Can Constrain the Primordial Orbits of the Gas Giants
Mars’ Formation Can Constrain the Primordial Orbits of the Gas Giants
复制标题
火星的形成可以限制气态巨行星的原始轨道
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
R. Brasser
中科院分区：
文献类型：
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作者：
J. Woo;J. Stadel;S. Grimm;R. Brasser
最近的高精度陨石数据推断，火星在太阳系开始的1000万年内迅速完成了它的吸积，并且有一个与地球不完全重叠的吸积区。在这里，我们提出了一个详细的研究吸积区的行星胚胎从高分辨率模拟的星子在磁盘。我们发现，所有对木星和土星在其当前偏心轨道（EJS）上的模拟都会导致快速形成的火星和地球区域胚胎之间存在类似的吸积区。另一方面，假设木星和土星（CJS）的轨道更圆，则有更高的机会形成火星，其吸积区不完全由地球和金星区域的胚胎主导;然而，CJS形成火星的速度一般比EJS慢。通过用平均重叠系数（OVL）进一步量化不同区域胚胎吸积区之间的重叠程度，我们发现CJS的OVL与地球和火星的同位素混合模型的OVL显示出更好的匹配，这表明巨行星在气盘耗散期间可能居住在比今天更圆的轨道上，与他们推测的不稳定前轨道相匹配更多的样本，包括来自水星和金星的样本，可能会证实这一假设。
Recent high-precision meteoritic data infers that Mars finished its accretion rapidly within 10 Myr of the beginning of the Solar System and had an accretion zone that did not entirely overlap with the Earth’s. Here we present a detailed study of the accretion zone of planetary embryos from high-resolution simulations of planetesimals in a disk. We found that all simulations with Jupiter and Saturn on their current eccentric orbits (EJS) result in a similar accretion zone between fast-forming Mars and Earth-region embryos. Assuming more circular orbits for Jupiter and Saturn (CJS), on the other hand, has a significantly higher chance of forming Mars with an accretion zone not entirely dominated by Earth and Venus-region embryos; however, CJS in general forms Mars slower than in EJS. By further quantifying the degree of overlap between accretion zones of embryos in different regions with the average overlap coefficient (OVL), we found that the OVL of CJS shows a better match with the OVL from a chondritic isotopic mixing model of Earth and Mars, which indicates that the giant planets are likely to have resided on more circular orbits during gas disk dissipation than they do today, matching their suggested pre-instability orbits. More samples, including those from Mercury and Venus, could potentially confirm this hypothesis.
使用 GPU 加速的胚胎形成：重新评估陆地吸积的初始条件
影响因子：
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作者：
Clement, Matthew S.;Kaib, Nathan A.;Chambers, John E.
通讯作者：
Chambers, John E.