Collaborative Research: Spectral and Radiation Hydrodynamic Models of Photospheric Radius Expansion X-ray Bursts
合作研究:光球半径膨胀X射线爆发的光谱和辐射流体动力学模型
基本信息
- 批准号:2107218
- 负责人:
- 金额:$ 23.75万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2021
- 资助国家:美国
- 起止时间:2021-08-15 至 2025-07-31
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
Neutron stars (NS) are the most compact known stellar objects, apart from black holes. When a neutron star is in a binary orbit with another star, and material flows from the star to the neutron star, the NS can undergo an explosive outburst, which often includes the emission of X rays. Type I X-ray bursts are powered by unstable thermonuclear burning of freshly accreted hydrogen- and/or helium-rich material on the surface of a NS in a low-mass X-ray binary. About 20% of bursts are photospheric radius expansion (PRE) bursts, in which the luminosity of the burst is so high that radiation forces drive an optically thick wind that lifts the photosphere (outer shell from which light is radiated) off the NS surface. A research collaboration between the University of Virginia (UVa) and the University of Texas at Arlington will study the physics of PRE X-ray bursts, using a combination of sophisticated computer models to simulate X-ray bursts in 1D spherical symmetry and 2D axisymmetery, both in the Newtonian and general relativistic limits. They will compare the results of their simulations directly with observations. This work will allow astronomers to better understand neutron stars, how they interact with matter, and what is the balance of pressure, volume and temperature within neutron stars. The project will also facilitate STEM research among a number of groups. Two graduate students will be given training in state-of-the-art computational tools. The PIs will incorporate the research into their mentoring of undergraduate researchers from underrepresented groups in STEM fields through one principle investigator’s participation in the VA-NC alliance and Spelman College-UVa Exchange summer research programs and the other’s participation in the Louis Stokes Alliance for Minority Participation Summer Research Academy. The investigators will also draw on the research as part of their public outreach efforts. The proposed research would leverage state-of-the-art numerical simulation tools, combining MESA and Athena++ codes, to provide the most sophisticated simulation of PRE bursts to date. This includes generation of synthetic spectra at different points in the burst to calibrate assumptions commonly used to infer neutron star masses and radii from burst observations. This work is timely due to the wealth of new observations from NASA’s NICER mission, which provide better spectral coverage for later stages of burst evolution and have identified spectral lines in the burst spectra. Spectral modelling will be able to characterize constraints from continuum emission but also aid in the interpretation of these spectral features. These would be among the first calculations to self-consistently solve for the time-dependent solution in full general relativity while exploring the possible inclination dependence through non-spherical calculations.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.
中子星(NS)是除了黑洞之外已知的最紧凑的恒星物体。 当一颗中子星星星与另一颗星星处于双星轨道时,物质从星星流向中子星星星,NS可能会发生爆炸性爆发,通常包括X射线的发射。 I型X射线暴是由低质量X射线双星中NS表面新吸积的富氢和/或氦物质的不稳定热核燃烧提供动力。 大约20%的爆发是光球半径膨胀(PRE)爆发,其中爆发的光度如此之高,以至于辐射力驱动光学厚风,将光球(光辐射的外壳)从NS表面提起。 弗吉尼亚大学(UVa)和德克萨斯大学阿灵顿分校之间的一项研究合作将研究PRE X射线爆发的物理学,使用复杂的计算机模型组合来模拟牛顿和广义相对论极限下一维球对称和二维轴对称的X射线爆发。 他们将直接将模拟结果与观测结果进行比较。 这项工作将使天文学家更好地了解中子星,它们如何与物质相互作用,以及中子星内部的压力,体积和温度的平衡是什么。 该项目还将促进一些团体之间的STEM研究。两名研究生将接受最先进的计算工具的培训。PI将通过一名主要研究者参与VA-NC联盟和Spelman College-UVa Exchange夏季研究计划以及其他参与Louis Stokes少数民族参与夏季研究学院联盟,将研究纳入他们对STEM领域代表性不足群体的本科研究人员的指导。调查人员还将利用这项研究作为其公共宣传工作的一部分。拟议的研究将利用最先进的数值模拟工具,结合梅萨和Athena++代码,提供迄今为止最复杂的PRE爆发模拟。这包括在爆发的不同点生成合成光谱,以校准通常用于从爆发观测推断中子星星质量和半径的假设。这项工作是及时的,由于美国宇航局的NICER使命,它提供了更好的光谱覆盖的爆发演变的后期阶段,并确定了光谱线的爆发光谱的新的观测财富。光谱建模将能够表征来自连续发射的约束,但也有助于解释这些光谱特征。这将是第一个在完全广义相对论中自洽求解时间依赖解的计算,同时通过非球面计算探索可能的倾斜依赖性。该奖项反映了NSF的法定使命,并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,被认为值得支持。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
数据更新时间:{{ journalArticles.updateTime }}
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
Nevin Weinberg其他文献
Nevin Weinberg的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
{{ truncateString('Nevin Weinberg', 18)}}的其他基金
Collaborative Research: Dynamical Tides in Close Stellar Binaries and Exoplanetary Systems
合作研究:近距离恒星双星和系外行星系统中的动力潮汐
- 批准号:
2054353 - 财政年份:2020
- 资助金额:
$ 23.75万 - 项目类别:
Standard Grant
Collaborative Research: Dynamical Tides in Close Stellar Binaries and Exoplanetary Systems
合作研究:近距离恒星双星和系外行星系统中的动力潮汐
- 批准号:
1909718 - 财政年份:2019
- 资助金额:
$ 23.75万 - 项目类别:
Standard Grant
相似国自然基金
Research on Quantum Field Theory without a Lagrangian Description
- 批准号:24ZR1403900
- 批准年份:2024
- 资助金额:0.0 万元
- 项目类别:省市级项目
Cell Research
- 批准号:31224802
- 批准年份:2012
- 资助金额:24.0 万元
- 项目类别:专项基金项目
Cell Research
- 批准号:31024804
- 批准年份:2010
- 资助金额:24.0 万元
- 项目类别:专项基金项目
Cell Research (细胞研究)
- 批准号:30824808
- 批准年份:2008
- 资助金额:24.0 万元
- 项目类别:专项基金项目
Research on the Rapid Growth Mechanism of KDP Crystal
- 批准号:10774081
- 批准年份:2007
- 资助金额:45.0 万元
- 项目类别:面上项目
相似海外基金
Collaborative Research: Enabling Cloud-Permitting and Coupled Climate Modeling via Nonhydrostatic Extensions of the CESM Spectral Element Dynamical Core
合作研究:通过 CESM 谱元动力核心的非静水力扩展实现云允许和耦合气候建模
- 批准号:
2332469 - 财政年份:2024
- 资助金额:
$ 23.75万 - 项目类别:
Continuing Grant
Collaborative Research: Enabling Cloud-Permitting and Coupled Climate Modeling via Nonhydrostatic Extensions of the CESM Spectral Element Dynamical Core
合作研究:通过 CESM 谱元动力核心的非静水力扩展实现云允许和耦合气候建模
- 批准号:
2332468 - 财政年份:2024
- 资助金额:
$ 23.75万 - 项目类别:
Continuing Grant
Collaborative Research: SWIFT: AI-based Sensing for Improved Resiliency via Spectral Adaptation with Lifelong Learning
合作研究:SWIFT:基于人工智能的传感通过频谱适应和终身学习提高弹性
- 批准号:
2229471 - 财政年份:2023
- 资助金额:
$ 23.75万 - 项目类别:
Standard Grant
Collaborative Research: SWIFT: AI-based Sensing for Improved Resiliency via Spectral Adaptation with Lifelong Learning
合作研究:SWIFT:基于人工智能的传感通过频谱适应和终身学习提高弹性
- 批准号:
2229473 - 财政年份:2023
- 资助金额:
$ 23.75万 - 项目类别:
Standard Grant
Collaborative Research: CPS: Medium: Robotic Perception and Manipulation via Full-Spectral Wireless Sensing
合作研究:CPS:媒介:通过全光谱无线传感进行机器人感知和操纵
- 批准号:
2313234 - 财政年份:2023
- 资助金额:
$ 23.75万 - 项目类别:
Standard Grant
Collaborative Research: CPS: Medium: Robotic Perception and Manipulation via Full-Spectral Wireless Sensing
合作研究:CPS:媒介:通过全光谱无线传感进行机器人感知和操纵
- 批准号:
2313233 - 财政年份:2023
- 资助金额:
$ 23.75万 - 项目类别:
Standard Grant
Collaborative Research: Spectral Discrimination of Single Molecules with Photoactivatable Fluorescence
合作研究:利用光激活荧光对单分子进行光谱辨别
- 批准号:
2246547 - 财政年份:2023
- 资助金额:
$ 23.75万 - 项目类别:
Standard Grant
Collaborative Research: Spectral Discrimination of Single Molecules with Photoactivatable Fluorescence
合作研究:利用光激活荧光对单分子进行光谱辨别
- 批准号:
2246548 - 财政年份:2023
- 资助金额:
$ 23.75万 - 项目类别:
Standard Grant
Collaborative Research: SWIFT: AI-based Sensing for Improved Resiliency via Spectral Adaptation with Lifelong Learning
合作研究:SWIFT:基于人工智能的传感通过频谱适应和终身学习提高弹性
- 批准号:
2229472 - 财政年份:2023
- 资助金额:
$ 23.75万 - 项目类别:
Standard Grant
Collaborative Research: SHF: Medium: Co-optimizing Spectral Algorithms and Systems for High-Performance Graph Learning
合作研究:SHF:中:协同优化高性能图学习的谱算法和系统
- 批准号:
2212370 - 财政年份:2022
- 资助金额:
$ 23.75万 - 项目类别:
Continuing Grant