论文标题
内部太阳系中的狭窄磁盘可以解释四个陆地行星吗？
Can narrow disks in the inner solar system explain the four terrestrial planets?
论文作者
论文摘要
成功的太阳系模型必须重现四个陆地行星。在这里，我们关注1）在同一系统中形成汞和四个陆地行星的可能性（4-P系统）； 2）每个陆地行星的轨道特性和质量； 3）地球上一次巨大撞击的时机以及此后我们的星球积聚的质量。在解决这些约束方面，我们基于质量狭窄的质量全磁盘进行了450个陆地行星形成的N体模拟，其质量仅限于0.7-1.0 au。我们确定了164个模拟系统，但只有24个系统包含汞类似物，而8个系统为4-P。我们发现，包含少数胚胎的狭窄磁盘具有与火星和巨型行星相当的单个质量，其当前轨道上产生了最佳的前景，以满足这些约束。但是，仍然存在严重的缺点。汞类似物和4-P系统的形成效率过低（分别为5％和2％），大多数金星与地类似物质量比不正确。与现实（0.34 au）相比，汞和金星类似物也形成太近（〜0.15-0.21 au）。同样，金星和地球类似物之间的相互距离大于观察到的相互距离（0.34 vs. 0.28 au）。此外，金星 - 地球对在轨道质量的空间统计上没有再现。总体而言，我们的结果表明使用狭窄磁盘来解释内部太阳系的严重问题。特别是，汞的形成仍然是陆地行星形成模型的重大问题。
A successful solar system model must reproduce the four terrestrial planets. Here, we focus on 1) the likelihood of forming Mercury and the four terrestrial planets in the same system (a 4-P system); 2) the orbital properties and masses of each terrestrial planet; and 3) the timing of Earth's last giant impact and the mass accreted by our planet thereafter. Addressing these constraints, we performed 450 N-body simulations of terrestrial planet formation based on narrow protoplanetary disks with mass confined to 0.7-1.0 au. We identified 164 analogue systems, but only 24 systems contained Mercury analogues, and eight systems were 4-P ones. We found that narrow disks containing a small number of embryos with individual masses comparable to that of Mars and the giant planets on their current orbits yielded the best prospects for satisfying those constraints. However, serious shortcomings remain. The formation of Mercury analogues and 4-P systems was too inefficient (5% and 2%, respectively), and most Venus-to-Earth analogue mass ratios were incorrect. Mercury and Venus analogues also formed too close to each other (~0.15-0.21 au) compared to reality (0.34 au). Similarly, the mutual distances between the Venus and Earth analogues were greater than those observed (0.34 vs. 0.28 au). Furthermore, the Venus-Earth pair was not reproduced in orbital-mass space statistically. Overall, our results suggest serious problems with using narrow disks to explain the inner solar system. In particular, the formation of Mercury remains an outstanding problem for terrestrial planet formation models.
