A SUBLIME 3D Model for Non-LTE Emission from Cometary and Icy Moon Atmospheres

彗星和冰冷月球大气层非 LTE 发射的 3D 模型

• 批准号: 2009253
• 负责人: Martin Cordiner
• 金额: $ 36.66万
• 依托单位: Catholic University of America
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2009253&HistoricalAwards=false
• 关键词: SUBLIME; 3D; Model; Non; LTE

In its early history, the Sun was embedded in a debris disk of dust and gas that extended beyond the orbit of Pluto. Comets formed in the outer regions of this disk, where they remain unchanged until a gravitational encounter with another object sends them in towards the Sun in a highly eccentric orbit. Cometary nuclei thus provide a crucial window back in time to the earliest stages of planet formation. This team will investigate the physical processes and chemical makeup of comets and planetary icy moons. They will use new computational tools to interpret high-resolution radio/submillimeter images of a significant sample of comets to gain new insights into the chemistry of cometary nuclei, and they will study the atmospheres of the icy moons of Jupiter and Saturn. Atmospheric plumes from these icy moons can reveal the compositions of hidden, sub- surface oceans, which might provide potential habitats for life. The PI will mentor undergraduate students from minority-serving university institutions through a summer research internship program. The grant will produce a new spectral line modeling suite (SUBLIME), based on the open source Line Modeling Engine, adapted for low-density atmospheres/exospheres of comets and icy moons. This code will accurately solve the molecular excitation and radiation transfer in three dimensions. The model will combine a 3D Monte Carlo radiative transfer and excitation code with a parameterized optimal estimation (retrieval) engine. New collisional rates for CO-CO, HCN-H2O and CH3-OH-H2O systems will be generated via quantum chemical calculations, including the construction of detailed potential energy surfaces and subsequent solving of the molecular dynamics. The model will be applied to ALMA observations of cometary and icy moon atmospheres to gain understanding of their physical processes and chemical abundances.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.

在太阳的早期历史中，太阳被嵌入在一个尘埃和气体的碎片盘中，该碎片盘延伸到冥王星轨道之外。彗星形成于这个圆盘的外部区域，在那里它们保持不变，直到与另一个物体的引力相遇，使它们以高度偏心的轨道朝向太阳。因此，彗星核提供了一个关键的窗口，可以追溯到行星形成的最早阶段。这个小组将研究彗星和行星冰卫星的物理过程和化学组成。他们将使用新的计算工具来解释彗星重要样本的高分辨率无线电/亚毫米图像，以获得对彗星核化学的新见解，他们将研究木星和土星的冰冷卫星的大气层。来自这些冰冷卫星的大气羽流可以揭示隐藏的地下海洋的成分，这些海洋可能为生命提供潜在的栖息地。PI将通过暑期研究实习计划指导来自少数民族服务大学机构的本科生。该赠款将产生一个新的谱线建模套件（SUBLIME），基于开源的线建模引擎，适用于低密度大气/彗星和冰冷卫星的外太空。 该代码将精确地解决三维分子激发和辐射传输。该模型将结合联合收割机的三维蒙特卡罗辐射传输和激励代码与参数化的最佳估计（检索）引擎。CO-CO、HCN-H2O和CH 3-OH-H2O体系的新碰撞速率将通过量子化学计算产生，包括详细势能面的构建和随后的分子动力学求解。 该模型将被应用于阿尔马彗星和冰冷的月球大气观测，以了解其物理过程和化学丰度。该奖项反映了NSF的法定使命，并已被认为是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的支持。

项目成果

The excitation of CO in CO-dominated cometary comae

CO 主导的彗星彗发中 CO 的激发

• DOI: 10.1093/mnras/stad268
• 发表时间: 2023
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Żółtowski, M.;Lique, F.;Loreau, J.;Faure, A.;Cordiner, M.
• 通讯作者: Cordiner, M.

Observations of comet C/2020 F3 (NEOWISE) with IRAM telescopes

使用 IRAM 望远镜观测彗星 C/2020 F3 (NEOWISE)

• DOI: 10.1051/0004-6361/202244970
• 发表时间: 2022
• 期刊: Astronomy & Astrophysics
• 影响因子: 6.5
• 作者: Biver, N.;Boissier, J.;Bockelée-Morvan, D.;Crovisier, J.;Cottin, H.;Cordiner, M. A.;Roth, N. X.;Moreno, R.
• 通讯作者: Moreno, R.

A SUBLIME 3D Model for Cometary Coma Emission: The Hypervolatile-rich Comet C/2016 R2 (PanSTARRS)

彗星彗发发射的卓越 3D 模型：富含高挥发性的彗星 C/2016 R2 (PanSTARRS)

• DOI: 10.3847/1538-4357/ac5893
• 发表时间: 2022
• 期刊: The Astrophysical Journal
• 作者: Cordiner, M. A.;Coulson, I. M.;Garcia-Berrios, E.;Qi, C.;Lique, F.;Zołtowski, M.;de Val-Borro, M.;Kuan, Y. -J.;Ip, W. -H.;Mairs, S.
• 通讯作者: Mairs, S.

Gas Sources from the Coma and Nucleus of Comet 46P/Wirtanen Observed Using ALMA

使用 ALMA 观测到的 46P/Wirtanen 彗发和彗核的气体来源

• DOI: 10.3847/1538-4357/ace0bc
• 发表时间: 2023
• 期刊: The Astrophysical Journal
• 作者: Cordiner, M. A.;Roth, N. X.;Milam, S. N.;Villanueva, G. L.;Bockelée-Morvan, D.;Remijan, A. J.;Charnley, S. B.;Biver, N.;Lis, D. C.;Qi, C.
• 通讯作者: Qi, C.

Coma composition of comet 67P/Churyumov-Gerasimenko from radio-wave spectroscopy

无线电波光谱中 67P/Churyumov-Gerasimenko 彗星的彗发成分

• DOI: 10.1051/0004-6361/202245672
• 发表时间: 2023
• 期刊: Astronomy & Astrophysics
• 影响因子: 6.5
• 作者: Biver, N.;Bockelée-Morvan, D.;Crovisier, J.;Sandqvist, Aa.;Boissier, J.;Lis, D. C.;Cordiner, M.;Bonev, B. P.;Dello Russo, N.;Moreno, R.
• 通讯作者: Moreno, R.