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arXiv 2004.11061astro-ph.EP
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确定天王星和海王星挥发物源库的关键大气特征

Key Atmospheric Signatures for Identifying the Source Reservoirs of Volatiles in Uranus and Neptune

O. Mousis, A. Aguichine, D. H. Atkinson, S. K. Atreya, T. Cavalié, J. I. Lunine, K. E. Mandt, T. Ronnet

摘要:

我们调查的几个交付方案的挥发物的冰巨人的大气中的富集模式,记住,唯一的约束远程确定,即碳丰度测量,表明他们的信封具有高度超太阳金属,即接近两个数量级以上的原太阳星云。在核心吸积模型的框架下,只有挥发物以固体形式(无定形冰,包合物,纯冷凝物)输送到这些行星才能解释它们的包层的表观超太阳金属丰度。相比之下,由于冰粒子通过各种雪线向内漂移,所有机制调用蒸汽形式的挥发物的输送预测在天王星和海王星的信封太阳下的丰度。或者,即使我们的太阳系中的盘不稳定机制仍然存在疑问,它可能与天王星和海王星观测到的超太阳金属丰度一致,假设这两颗行星随后遭受了H-He包层的侵蚀。从所考虑的每一种运载设想中得出的浓缩模式应有助于解释今后通过大气层进入探测器进行的现场测量。

英文摘要:

We investigate the enrichment patterns of several delivery scenarios of the volatiles to the atmospheres of ice giants, having in mind that the only well constrained determination made remotely, i.e. the carbon abundance measurement, suggests that their envelopes possess highly supersolar metallicities, i.e. close to two orders of magnitude above that of the protosolar nebula. In the framework of the core accretion model, only the delivery of volatiles in solid forms (amorphous ice, clathrates, pure condensates) to these planets can account for the apparent supersolar metallicity of their envelopes. In contrast, because of the inward drift of icy particles through various snowlines, all mechanisms invoking the delivery of volatiles in vapor forms predict subsolar abundances in the envelopes of Uranus and Neptune. Alternatively, even if the disk instability mechanism remains questionable in our solar system, it might be consistent with the supersolar metallicities observed in Uranus and Neptune, assuming the two planets suffered subsequent erosion of their H-He envelopes. The enrichment patterns derived for each delivery scenario considered should be useful to interpret future in situ measurements by atmospheric entry probes.

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