近日，西班牙瓦伦西亚大学的J. B. Climent及研究小组取得一项新进展。经过不懈努力，他们找到褐矮星周围存在辐射带的证据
该研究团队利用超长基线干涉测量法对褐矮星LSR J1835+3259进行了空间分辨射电观测，结果显示出扩展的射电发射，形态与存在的辐射带存在相一致。与模型的比较表明，辐射带中含有受磁镜约束的高能粒子。研究人员认为，射电发射的超冷矮星具有偶极有序的磁场，具有辐射带状的形态和极光，类似于木星。
据悉，超冷矮星（UCDs）包括褐矮星和非常低质量的恒星，是一类重要的天体。通过对超冷矮星的射电观测，可以测量它们的亮度作为时间（光曲线）和光谱能量分布的函数，从而深入了解它们的磁场。
附：英文原文
Title: Evidence for a radiation belt around a brown dwarf
Author: J. B. Climent, J. C. Guirado, M. Pérez-Torres, J. M. Marcaide, L. Pea-Moino
Issue&Volume: 2023-09-08
Abstract: Ultracool dwarfs (UCDs) are a category of astronomical objects that includes brown dwarfs and very-low-mass stars. Radio observations of UCDs have measured their brightness as a function of time (light curves) and spectral energy distributions, providing insight into their magnetic fields. We present spatially resolved radio observations of the brown dwarf LSR J1835+3259 using very-long-baseline interferometry showing extended radio emission. The detected morphology is consistent with the presence of a radiation belt. Comparison with models indicates that the radiation belt contains energetic particles confined by magnetic mirroring. We contend that radio-emitting UCDs have dipole-ordered magnetic fields with radiation belt–like morphologies and aurorae that are similar to those of Jupiter.
DOI: adg6635
Source: https://www.science.org/doi/full/10.1126/science.adg6635