Lifting the veil on Wolf-Rayet rotation using wind structure: Multi-wavelength and Spectropolarimetric Approaches

利用风结构揭开沃尔夫拉叶旋转的面纱：多波长和分光偏振方法

基本信息

批准号：
2009412
负责人：
Richard Ignace
金额：
$ 30.28万
依托单位：
East Tennessee State University
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：
2020-08-01 至 2024-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2009412&HistoricalAwards=false
关键词：
Lifting veil Wolf Rayet rotation

项目摘要

When a Wolf-Rayet (WR) star goes supernova, its core collapses to form either a black hole or a neutron star. The outcome depends on how fast the WR star was spinning, but this is difficult to measure for WR stars, which are shrouded by their own wind. However, distortions in the wind can form corotating interaction regions (CIRs), which act as clocks and enable the spin period to be determined. Ignace and his team will monitor WR stars to look for CIRs. They will determine the spin period and further interpret these observations using their theoretical models to help us understand how wind features are formed. Undergraduate students will be recruited for a summer research program. Ignace and his team will develop a planetarium show for the general public and local high schools. The show on “space weather” will include a segment on how CIR’s in the Solar wind can enhance geomagnetic storms. The team will enhance an existing Monte Carlo radiative transfer code to characterize how rotational effects can modulate the wind and form CIRs. The comparison of the models to observations with the Echelle SpectroPolarimetric Device for the Observation of Stars on the Canada France Hawaii Telescope will result in a robust picture of the complex structures in WR winds. For the first time, the team will be able to relate electron scattering polarization in thick winds with a model for axisymmetric WR winds, as a function of stellar rotation relative to critical break-up. Modeling both varying and non-varying contributions to polarization is important for measuring periods and constraining mass-loss rates. To complete the picture, the team will model the influence of CIRs on variable IR/radio continuum flux. Polarization probes structures in the inner wind; the long-wavelength continuum probes the asymptotic flow.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.

当狼射线（WR）恒星变为超新星时，其核心倒塌形成了黑洞或中子之星。结果取决于WR恒星旋转的速度，但是对于WR恒星来说，这很难被自己的风笼罩。但是，风中的扭曲可以形成旋转相互作用区域（CIR），该区域充当时钟并能够确定自旋周期。 Ignace和他的团队将监视WR明星寻找CIRS。他们将使用其理论模型来确定自旋时期，并进一步解释这些观察结果，以帮助我们了解风能的形成。本科生将被招募参加夏季研究计划。 Ignace和他的团队将为普通公立和当地高中开发一个天文馆表演。关于“太空天气”的节目将包括有关太阳风中CIR如何增强地磁风暴的部分。该团队将增强现有的蒙特卡洛辐射转移代码，以表征旋转效应如何调节风并形成CIR。模型与使用梯形光谱图的观测值的比较，以观察加拿大法国夏威夷望远镜上的恒星，将导致WR风中复杂结构的强大图像。该团队首次能够将厚风中的电子散射与轴测WR风的模型相关联，这是相对于临界分裂的恒星旋转的函数。建模对极化的变化和非变化贡献对于测量周期和限制质量损失率很重要。为了完成图片，团队将建模CIR对可变IR/无线电持续磁通的影响。内风中的极化问题结构；长波长继续探测不对称的流动。该奖项反映了NSF的法定任务，并通过使用基金会的知识分子优点和更广泛的影响评估标准来评估值得支持。

项目成果

期刊论文数量（4）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Radio Spectral Energy Distributions for Single Massive Star Winds with Free–Free and Synchrotron Emission

具有自由和同步加速器发射的单个大质量星风的无线电频谱能量分布

DOI：
10.3847/1538-4357/ac6c90
发表时间：
2022
期刊：
The Astrophysical Journal
影响因子：
0
作者：
Erba, Christiana;Ignace, Richard
通讯作者：
Ignace, Richard

Spectroscopic and evolutionary analyses of the binary system AzV 14 outline paths toward the WR stage at low metallicity

双星系统 AzV 14 的光谱和演化分析概述了低金属丰度下通往 WR 阶段的路径

DOI：
10.1051/0004-6361/202345881
发表时间：
2023
期刊：
Astronomy & Astrophysics
影响因子：
6.5
作者：
Pauli, D.;Oskinova, L. M.;Hamann, W.-R.;Bowman, D. M.;Todt, H.;Shenar, T.;Sander, A. A.;Erba, C.;Gómez-González, V. M.;Kehrig, C.
通讯作者：
Kehrig, C.

New Mass Estimates for Massive Binary Systems: A Probabilistic Approach Using Polarimetric Radiative Transfer

DOI：
10.3847/1538-4357/ac589e
发表时间：
2022-02
期刊：
The Astrophysical Journal
影响因子：
0
作者：
A. Fullard;J. O’Brien;W. E. Kerzendorf;M. Shrestha;J. Hoffman;R. Ignace;Patrick van der Smagt
通讯作者：
A. Fullard;J. O’Brien;W. E. Kerzendorf;M. Shrestha;J. Hoffman;R. Ignace;Patrick van der Smagt

A scaling relationship for non-thermal radio emission from ordered magnetospheres: from the top of the main sequence to planets

DOI：
10.1093/mnras/stab2168
发表时间：
2021-07
期刊：
影响因子：
0
作者：
P. Leto;C. Trigilio;J. Krtička;L. Fossati;R. Ignace;M. Shultz;C. Buemi;L. Cerrigone;G. Umana-G.
通讯作者：
P. Leto;C. Trigilio;J. Krtička;L. Fossati;R. Ignace;M. Shultz;C. Buemi;L. Cerrigone;G. Umana-G.