论文标题
在行星中受到影响和核心冷却约束的太阳星云的耗散
The Dissipation of the Solar Nebula Constrained by Impacts and Core Cooling in Planetesimals
论文作者
论文摘要
基于金理冷却速率，已经推断出几种铁陨石体体的行星核心快速冷却，并与撞击过程中绝缘披风的损失有关。但是，这些破坏性事件的时机受到了很大的约束。在这里，我们通过确定铁陨石的PD-AG年龄来使用短寿命的107PD / 107AG衰减系统来快速核心冷却。我们显示的铁陨石的闭合时间等于在CAI之后的时间范围内〜7.8至11.7 Myr，并指出此时有能量的内部太阳系持续存在。这可能是由于原电磁磁盘中气体的耗散而导致的，之后气体阻力的阻尼效应不再存在。 CAI之后5至14 Myr之间的早期巨型行星不稳定可以增强这种影响。这与PD AG系统在铁陨石中记录的影响时机非常相关。
Rapid cooling of planetesimal cores has been inferred for several iron meteorite parent bodies based on metallographic cooling rates, and linked to the loss of their insulating mantles during impacts. However, the timing of these disruptive events is poorly constrained. Here, we used the short-lived 107Pd / 107Ag decay system to date rapid core cooling by determining Pd-Ag ages for iron meteorites. We show closure times for the iron meteorites equate to cooling in the timeframe ~7.8 to 11.7 Myr after CAI, and indicate that an energetic inner Solar System persisted at this time. This likely results from the dissipation of gas in the protoplanetary disk, after which the damping effect of gas drag ceases. An early giant planet instability between 5 and 14 Myr after CAI could have reinforced this effect. This correlates well with the timing of impacts recorded by the Pd Ag system for iron meteorites.
