arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0908.0743astro-ph.EP
收藏

类地行星从一个狭窄的环带中形成

Formation of the Terrestrial Planets from a Narrow Annulus

Brad Hansen

摘要:

我们表明,组装的太阳系类地行星可以成功地建模与所有的质量最初局限于一个狭窄的环带之间的0.7和1.0 AU。在这种结构下,水星和火星的类似物通常是在形成中的地球和金星类似物的散射下,从环中扩散出来的物质的碰撞演化形成的。最终的系统也具有与观测结果相匹配的偏心率和倾斜度,而不依赖于残余小天体种群的动力学摩擦。最后,在这个模型中,地球类似物的特征组装时间尺度是快速的,并且与基于$^{182}$ Hf- $^{182}$ W同位素的宇宙化学模型一致。这一模型与观测结果之间的一致性表明,类地行星系统也可能形成于“行星陷阱”中,正如最近对我们太阳系和其他星系中的巨行星核心所提出的那样。

英文摘要:

We show that the assembly of the Solar System terrestrial planets can be successfully modelled with all of the mass initially confined to a narrow annulus between 0.7 and 1.0 AU. With this configuration, analogues of Mercury and Mars often form from the collisional evolution of material diffusing out of the annulus under the scattering of the forming Earth and Venus analogues. The final systems also possess eccentricities and inclinations that match the observations, without recourse to dynamical friction from remnant small body populations. Finally, the characteristic assembly timescale for Earth analogues is rapid in this model, and consistent with cosmochemical models based on the $^{182}$Hf--$^{182}$W isotopes. The agreement between this model and the observations suggests that terrestrial planet systems may also be formed in `planet traps', as has been proposed recently for the cores of giant planets in our solar system and others.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑