Magnetars and neutron stars emission - model development in the IXPE/eXTP era

磁星和中子星发射 - IXPE/eXTP 时代的模型开发

• 批准号: 2728096
• 金额: --
• 依托单位: University College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2728096
• 关键词: Magnetars; neutron; stars; emission; model

Neutron stars (NSs), the end points of massive stars, are the most magnetic objects in the Universe. The project will study two unique type of NSs - XDINS and magnetars. Their ultra-strong magnetic field (up to 1E14-1E15 G) makes them unique laboratories to test fundamental physics under conditions not reproducible on Earth. Several issues are still unresolved: dedicated model atmosphere codes do not exist to simulate the emission from the star surface when the neutron star is surrounded by an active magnetosphere and current back bombard the surface. Also, the issue of modeling a realistic thermal map taking into account for the very anisotropic conductivity of the code is open. The emission generate from the surface is expected to be highly polarized, and further polarization is expected to be acquired through scattering as the light travel across the magnetosphere. The student is expected to tackle part of these points, readapting and extending dedicated codes to simulate the expected spectrum, lightcurve and polarization degrees, to be compared with existing observations. Results are expected to contribute to the scientific working groups of next generation X-ray polarimetric space missions, as IXPE (NASA) and eXTP (CAS).

中子星（NS）是大质量恒星的终点，是宇宙中最具磁性的物体。该项目将研究两种独特类型的NS- XDINS和磁星。它们的超强磁场（高达1 E14 - 1 E15 G）使它们成为独特的实验室，可以在地球上无法重现的条件下测试基础物理学。有几个问题仍然没有得到解决：当中子星星被活跃的磁层所包围，电流反向轰击表面时，没有专门的模型大气代码来模拟来自星星表面的辐射。此外，考虑到代码的非常各向异性的电导率，对现实的热图进行建模的问题是开放的。预计从表面产生的发射是高度偏振的，并且随着光穿过磁层，预计通过散射获得进一步的偏振。学生应解决这些问题的一部分，重新调整和扩展专用代码，以模拟预期的光谱，光变曲线和偏振度，与现有的观测结果进行比较。预计结果将有助于下一代X射线偏振空间任务的科学工作组，如IXPE（NASA）和eXTP（CAS）。