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Collaborative Research: Bound-Bound and Bound-Free Opacities of Heavy Lowly-Charged r-Process Ions

合作研究：重的低电荷 r 过程离子的束缚和自由不透明度

基本信息

批准号：
1816984
负责人：
Stuart Loch
金额：
$ 29.08万
依托单位：
Auburn University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-09-01 至 2022-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1816984&HistoricalAwards=false
关键词：
Collaborative Research Bound Free Opacities

项目摘要

This research project is a collaborative effort between three major universities in the southeastern United States. The research team will undertake a combined theoretical and experimental study of heavy elements that are produced in neutron star mergers, which have recently been shown to be gravitational wave sources. The researchers will calculate the optical and infrared signatures of these elements and measure them in the laboratory to high accuracy. Data on these elements are so limited that it is difficult to interpret observations of neutron star mergers. Results from the study will allow astronomers to accurately interpret spectroscopic observations of neutron star mergers and to understand how heavy elements are formed in such mergers. The project will provide students with research training, as well as opportunities to work on diverse but related topics at the three institutions.The research team will study the so-called "second peak" elements --- Re, Os, Ir, Au, and Pt --- because these are predicted to be formed at relatively high abundances in neutron star mergers. They will first calculate the atomic energy levels and transition probabilities of these elements using highly accurate and sophisticated quantum methods. They will then measure the optical and infrared spectra of the elements to benchmark the calculations. The result will be reliable properties and accurate spectral line lists, which can be used for the identification of these elements and determination of their abundances in the spectra of neutron star mergers. This will also help shed light on the rapid neutron capture process --- or "r-process" --- involved in the synthesis of heavy elements in space. This project will train graduate and undergraduate students in theoretical and experimental atomic physics, as well as astrophysics.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.

该研究项目是美国东南部三所主要大学之间的合作项目。该研究小组将对中子星星合并产生的重元素进行综合理论和实验研究，这些重元素最近被证明是引力波源。研究人员将计算这些元素的光学和红外特征，并在实验室中进行高精度测量。关于这些元素的数据是如此有限，以至于很难解释中子星星合并的观测结果。这项研究的结果将使天文学家能够准确地解释中子星星合并的光谱观测，并了解重元素是如何在这种合并中形成的。该项目将为学生提供研究培训，以及在三家机构从事各种相关主题工作的机会。研究小组将研究所谓的“第二峰”元素-- Re，Os，Ir，Au和Pt --因为这些元素预计在中子星星合并中以相对高的丰度形成。他们将首先使用高度精确和复杂的量子方法计算这些元素的原子能级和跃迁概率。然后，他们将测量元素的光学和红外光谱，以基准计算。结果将是可靠的性质和准确的谱线表，可用于中子星星合并光谱中这些元素的鉴别和丰度的测定。这也将有助于揭示快速中子捕获过程---或“r-过程”---参与太空中重元素的合成。该项目将培养研究生和本科生的理论和实验原子物理学，以及天体物理学。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

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）

Relativistic Atomic Structure of Au IV and the Os Isoelectronic Sequence: Opacity Data for Kilonova Ejecta

Au IV 的相对论原子结构和 Os 等电子序列：千新星抛射物的不透明度数据

DOI：
10.3390/atoms10030094
发表时间：
2022
期刊：
Atoms
影响因子：
1.8
作者：
Taghadomi, Zahra Sadat;Wan, Yier;Flowers, Alicia;Stancil, Phillip;McLaughlin, Brendan;Bromley, Steven;Marler, Joan;Sosolik, Chad;Loch, Stuart
通讯作者：
Loch, Stuart

Atomic Iron and Nickel in the Coma of C/1996 B2 (Hyakutake): Production Rates, Emission Mechanisms, and Possible Parents

C/1996 B2（百武）彗发中的原子铁和镍：生产率、排放机制和可能的母体

DOI：
10.3847/psj/ac2dff
发表时间：
2021
期刊：
The Planetary Science Journal
影响因子：
0
作者：
Bromley, S. J.;Neff, B.;Loch, S. D.;Marler, J. P.;Országh, J.;Venkataramani, K.;Bodewits, D.
通讯作者：
Bodewits, D.

Atomic data calculations for Au i –Au iii and exploration in the application of collisional-radiative theory to laboratory and neutron star merger plasmas

Au i – Au iii 的原子数据计算以及碰撞辐射理论在实验室和中子星合并等离子体中的应用探索

DOI：
10.1093/mnras/stab3285
发表时间：
2021
期刊：
Monthly Notices of the Royal Astronomical Society
影响因子：
4.8
作者：
McCann, Michael;Bromley, S;Loch, S D;Ballance, C P
通讯作者：
Ballance, C P

Panning for Gold: New Emission Lines from UV–VIS Spectroscopy of Au I and Au II

淘金：Au I 和 Au II 紫外可见光谱的新发射线

DOI：
10.3847/1538-4365/abaa4d
发表时间：
2020
期刊：
The astrophysical journal
影响因子：
0
作者：
Bromley, S. J.;Johnson, C. A.;Ennis, D. A.;Hartwell, G. J.;Maurer, D. A.;Loch, S.D.;Stancil, P.C.;McLaughlin, B. M.;Sosolik, C. E.;Marler, J. P.
通讯作者：
Marler, J. P.

Electron-Impact Ionization of Heavy Atoms Using the Time-Dependent Close-Coupling Method