[论文解读] Solar Elemental Abundances

K. Lodders|arXiv (Cornell University)|Dec 2, 2019

Astro and Planetary Science被引用 38

一句话总结

对太阳系元素丰度历史的综述，以及来自CI碳质球粒陨石和太阳数据的新元素及同位素丰度评估。

ABSTRACT

Review of the history of solar system elemental abundances with a new assessment of elemental and isotopic abundances from CI-chondrites and solar data. Solar elemental abundances, or solar system elemental abundances refer to the complement of chemical elements in the entire solar system. The sun contains more than 99-percent of the mass in the solar system and therefore the composition of the sun is a good proxy for the composition of the overall solar system. The solar system composition can be taken as the overall composition of the molecular cloud within the interstellar medium from which the solar system formed 4.567 billion years ago. Active research areas in astronomy and cosmochemistry model collapse of a molecular cloud of solar composition into a star with a planetary system, and the physical and chemical fractionation of the elements during planetary formation and differentiation. The solar system composition is the initial composition from which all solar system objects (the sun, terrestrial planets, gas giant planets, planetary satellites and moons, asteroids, Kuiper-belt objects, and comets) were derived. (Abstract truncated).

研究动机与目标

• Summarize the historical development of solar and solar-system elemental abundances.
• Present a new assessment of elemental and isotopic abundances from CI-chondrites.
• Reinforce the solar composition as a representative proxy for the primordial solar system composition.

提出的方法

• Review of historical data and methods used to derive solar abundances.
• Integration of CI-chondrite data with solar observational data.
• Discussion of how solar composition informs models of molecular-cloud collapse and planetary formation.

实验结果

研究问题

• RQ1 What is the current best-estimate elemental and isotopic abundance in CI-chondrites?
• RQ2 How does solar data compare with CI-chondrite data in constraining solar system abundances?
• RQ3 What implications do solar abundances have for models of molecular cloud collapse and planetary differentiation?

主要发现

• The Sun contains the majority of the solar system mass, making its composition a good proxy for the overall solar system composition.
• CI-chondrite data and solar data are used together to reassess elemental and isotopic abundances relevant to solar system composition.
• The solar system composition serves as the initial composition for modeling planetary formation and differentiation processes.