DESI DR1中磁白矮星的综合研究
A Comprehensive Study of the Magnetic White Dwarfs in DESI DR1
- University of Florida（佛罗里达大学）
- Université de Montréal（蒙特利尔大学）
- University of Oklahoma（俄克拉荷马大学）
- Center for Astrophysics | Harvard & Smithsonian（哈佛-史密森天体物理中心）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究对DESI DR1中的磁白矮星进行模型大气分析，识别833个系统并拟合，发现核心对流发电机和巨星分支发电机分别解释不同质量的天体，为迄今最大样本，凸显多路复用巡天的优势。
AI中文摘要：
作为大多数恒星演化的终点，白矮星为恒星磁性提供了强有力的洞察。需要多种形成通道来解释观测到的磁白矮星的性质，而产生异常天体的机制有可能开启物理学的新领域。光谱巡天所提供的大样本使得以前所未有的水平研究这些过程成为可能。在这里，我们对DESI数据发布1中的磁白矮星进行了详细的模型大气分析。我们识别出833个磁系统，其中762个我们使用偏移偶极子模型进行了拟合。在这些系统中，127个目标需要更深入的分析，因为它们具有比偏移偶极子模型预测的更浅或更尖锐的吸收特征。对于这些目标，我们使用了一种斑块状偏移偶极子大气模型，其中磁场仅对可见恒星盘某些区域的谱线不透明度有贡献。我们将观测到的磁白矮星分布与产生磁场的机制进行了比较。我们发现，在主序上形成的核心对流发电机与许多磁系统的参数相匹配，而巨星分支上充满辐射内部的发电机则再现了许多核心对流发电机无法解释的低质量天体。这个样本是迄今为止最大的单次数据发布的磁白矮星样本。形成通道的多样性和具有异常场几何的天体的频率，凸显了多路复用巡天在推进我们对恒星磁性认识方面的力量。
英文摘要：
As the end point of stellar evolution for most stars, white dwarfs offer powerful insight into stellar magnetism. Multiple formation channels are required to explain the observed properties of magnetic white dwarfs, and the mechanisms that produce unusual objects have potential to unlock new realms of physics. The large samples made possible by spectroscopic surveys enable study of these processes on an unprecedented level. Here we perform a detailed model atmosphere analysis of the magnetic white dwarfs in DESI Data Release 1. We identify 833 magnetic systems, 762 of which we fit using an offset dipole model. Of these, 127 targets require more in-depth analysis as they possess shallower or sharper absorption features than predicted by the offset dipole model. For these we use a patchy offset dipole atmosphere model in which the magnetic field only contributes to the line opacities at certain regions of the visible stellar disk. We compare the observed distribution of magnetic white dwarfs to the mechanisms that generate magnetic fields. We find that a core-convective dynamo that forms on the main-sequence matches the parameters of many of the magnetic systems, while a dynamo that fills the radiative interior on the giant branch reproduces many of the lower mass objects that the core-convective dynamo cannot. This sample is the largest single data release of magnetic white dwarfs to date. The diversity of formation channels and the frequency of objects with unusual field geometries highlight the power of multiplexed surveys to advance our knowledge of stellar magnetism.
