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Modeling dust condensation in protoplanetary disks

模拟原行星盘中的尘埃凝结

基本信息

批准号：
1910955
负责人：
Jason Steffen
金额：
$ 55.25万
依托单位：
University of Nevada Las Vegas
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-09-01 至 2024-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1910955&HistoricalAwards=false
关键词：
Modeling dust condensation protoplanetary disks

项目摘要

The first step in planet formation is when dust condenses from gasses in a protoplanetary disk. Where and how the dust condenses will determine the composition of the planets. The inner planets of our Solar System formed at high temperature. As a result, they are depleted in volatile elements compared to the Sun. Previous studies of dust condensation have been limited by a series of idealizations that were made to make the computation easier. These idealizations included a single condensation temperature for each element or neglecting the evolution of the gas disk. They might have limited the number of elements in the model or ignored the thermal history of the system. The proposed work is to build higher-fidelity models that incorporate many more elements than previous models, and which incorporate the physics and development of the protoplanetary disk. The results of this work will be compared to elemental abundances in our Solar System to better understand the conditions in which our Solar System formed and will be used to predict variations in planetary composition in exoplanetary systems. The team will help to train future astronomers (and increase the STEM workforce) by including postdoctoral scholars and graduate students. They will also expand on their outreach efforts, including neighborhood star parties in Las Vegas, and a popular "Astronomy on Tap" program.The team will combine two existing codes to undertake new modeling of dust condensation in protoplanetary disks. The first is a protoplanetary disk evolution code written by one of the postdocs who will work on the project. The other is a thermodynamic code called GRAINS which models the condensation sequence of dust particles under given thermodynamic conditions. The resulting merged code will be called the Dynamical Disk Dust Condensation (DDDC) code. One of the innovations in the code will be the incorporation of gas pressure as a function of position in the disk and time. This will have the effect of altering the condensation temperature for a given element as a function of time and position. The resulting code will be used to model the formation of our own Solar System by using solar mean elemental abundances as input parameters. The team will then look at changes in observables as they change various parameters, including mass of the disk, angular velocity, temperature in the core, as well as thermal history and bulk composition. The results will be compared to Solar System values to constrain the early thermal history of our Solar System. They will also look at different disk compositions to examine what variations might exist in exoplanetary systems.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

行星形成的第一步是尘埃从原行星盘的气体中凝结。尘埃在哪里以及如何凝结将决定行星的组成。太阳系的内行星是在高温下形成的。因此，与太阳相比，它们缺乏挥发性元素。以前对尘埃凝结的研究受到一系列理想化的限制，这些理想化是为了使计算更容易。这些理想化包括每个元素的单一冷凝温度或忽略气体盘的演化。他们可能限制了模型中元素的数量，或者忽略了系统的热历史。拟议的工作是建立更高保真的模型，其中包括比以前的模型更多的元素，并纳入物理和发展的原行星盘。这项工作的结果将与太阳系中的元素丰度进行比较，以更好地了解太阳系形成的条件，并将用于预测系外行星系统中行星组成的变化。该团队将通过包括博士后学者和研究生来帮助培养未来的天文学家（并增加STEM劳动力）。他们还将扩大他们的外展工作，包括在拉斯维加斯举办社区星星派对，以及一个受欢迎的“自来水天文学”项目。该团队将联合收割机结合两个现有的代码，对原行星盘中的尘埃凝结进行新的建模。第一个是一个原行星盘演化代码，由一个将参与该项目的博士后编写。另一个是称为GRAINS的热力学代码，它模拟了在给定的热力学条件下尘埃粒子的凝结序列。合并后的代码将被称为动态磁盘灰尘冷凝（DDDC）代码。代码中的创新之一将是将气体压力作为磁盘中的位置和时间的函数。这将具有改变给定元件的冷凝温度作为时间和位置的函数的效果。由此产生的代码将被用来模拟我们自己的太阳系的形成，使用太阳平均元素丰度作为输入参数。然后，研究小组将研究可观测量的变化，因为它们改变了各种参数，包括磁盘的质量，角速度，核心温度，以及热历史和整体成分。结果将与太阳系的值进行比较，以限制我们太阳系的早期热历史。他们还将研究不同的盘组成，以研究在系外行星系统中可能存在的变化。该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估来支持。

项目成果

期刊论文数量（5）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Calcium isotope cosmochemistry

DOI：
10.1016/j.chemgeo.2021.120396
发表时间：
2021-06
期刊：
Chemical Geology
影响因子：
3.9
作者：
M. Valdes;K. Bermingham;Shichun Huang;J. Simon
通讯作者：
M. Valdes;K. Bermingham;Shichun Huang;J. Simon

Dust condensation in evolving discs and the composition of planetary building blocks

演化盘中的灰尘凝结和行星构件的组成

DOI：
10.1093/mnras/staa1149
发表时间：
2020
期刊：
Monthly Notices of the Royal Astronomical Society
影响因子：
4.8
作者：
Li, Min;Huang, Shichun;Petaev, Michail I;Zhu, Zhaohuan;Steffen, Jason H
通讯作者：
Steffen, Jason H

Sulfur isotopic signature of Earth established by planetesimal volatile evaporation

通过星子挥发性蒸发建立的地球硫同位素特征

DOI：
10.1038/s41561-021-00838-6
发表时间：
2021
期刊：
Nature Geoscience
影响因子：
18.3
作者：
Wang, Wenzhong;Li, Chun-Hui;Brodholt, John P.;Huang, Shichun;Walter, Michael J.;Li, Min;Wu, Zhongqing;Huang, Fang;Wang, Shui-Jiong
通讯作者：
Wang, Shui-Jiong

Maximum temperatures in evolving protoplanetary discs and composition of planetary building blocks

演化中的原行星盘的最高温度和行星构件的组成