论文标题
超极气的木星可能形成
The possible formation of Jupiter from supersolar gas
论文作者
论文摘要
二十多年前，伽利略探测器对木星大气组成的原位测量进行了测量，发现C，N，S，S，P，AR，KR和XE的丰度均由其原始值的1.5--5.4倍。 Juno的测量最近证实了Superall n的丰度，并且还发现与其原始极值相比，O的丰度富含1--5。在这里，我们旨在确定原始星云中气体和固体组成的径向和时间演化（以下称为PSN），以评估木星当前的当前组成是通过直接积聚超极气体获得的。为此，我们对1D $α-$粘性积聚磁盘的演变进行了建模，该磁盘包括灰尘和冰颗粒的径向运输及其蒸气，并以其升华和冷凝速率来计算PSN的组成。我们发现，木星信封的组成只能从PSN气体的积聚（$α\ le 10^{ - 3} $）或蒸气和固体的混合物（$α> 10^{ - 3} $）中解释。 PSN在4 au处的组成，即在h $ _2 $ o和co $ _2 $ iCelines的位置之间，再现在木星100至300 kyr的磁盘演化之间。发现我们的结果与核心积聚模型兼容，在该模型中，木星将通过富含挥发性的富含挥发性的行星和引力塌陷情景而获得其金属性，在这种情况下，原始jupiter的组成将与PSN相似。
More than two decades ago, the Galileo probe performed in situ measurements of the composition of Jupiter's atmosphere and found that the abundances of C, N, S, P, Ar, Kr and Xe were all enriched by factors of 1.5--5.4 times their protosolar value. Juno's measurements recently confirmed the supersolar N abundance and also found that the O abundance was enriched by a factor 1--5 compared to its protosolar value. Here, we aim at determining the radial and temporal evolution of the composition of gases and solids in the protosolar nebula (hereafter, PSN) to assess the possibility that Jupiter's current composition was acquired via the direct accretion of supersolar gases. To do so, we model the evolution of a 1D $α-$viscous accretion disk that includes the radial transport of dust and ice particles and their vapors, with their sublimation and condensation rates, to compute the composition of the PSN. We find that the composition of Jupiter's envelope can be explained only from its accretion from PSN gas ($α\le 10^{-3}$), or from a mixture of vapors and solids ($α>10^{-3}$). The composition of the PSN at 4 AU, namely between the locations of the H$_2$O and CO$_2$ icelines, reproduces the one measured in Jupiter between 100 and 300 kyr of disk evolution. Our results are found compatible with both the core accretion model, where Jupiter would acquire its metallicity by late accretion of volatile-rich planetesimals, and the gravitational collapse scenario, where the composition of proto-Jupiter would be similar to that of the PSN.
