论文标题
主动行星托管的磁场m矮人au mic
Magnetic Field of the Active Planet-hosting M Dwarf AU Mic
论文作者
论文摘要
Au Mic是一颗年轻，非常活跃的M矮人恒星，带有碎片盘和至少一个过境的海王星大小的行星。在这里，我们基于先前未发表的高分辨率光学和近红外光谱观测，对AU MIC的磁场进行了详细分析。我们报告了恒星光谱线中圆形和线性极化特征的系统检测。 Tentative Zeeman Doppler imaging modeling of the former data suggests a non-axisymmetric global field with a surface-averaged strength of about 90 G. At the same time, linear polarization observations indicate the presence of a much stronger $\approx$2 kG axisymmetric dipolar field, which contributes no circular polarization signal due to the equator-on orientation of AU Mic.单独的Zeeman扩大和强化分析使我们能够分别从Y和K波段原子线确定2.3和2.1 kg的平均场模量。这些磁场测量对于理解AU MIC行星系统内的环境条件至关重要。
AU Mic is a young, very active M dwarf star with a debris disk and at least one transiting Neptune-size planet. Here we present detailed analysis of the magnetic field of AU Mic based on previously unpublished high-resolution optical and near-infrared spectropolarimetric observations. We report a systematic detection of circular and linear polarization signatures in the stellar photospheric lines. Tentative Zeeman Doppler imaging modeling of the former data suggests a non-axisymmetric global field with a surface-averaged strength of about 90 G. At the same time, linear polarization observations indicate the presence of a much stronger $\approx$2 kG axisymmetric dipolar field, which contributes no circular polarization signal due to the equator-on orientation of AU Mic. A separate Zeeman broadening and intensification analysis allowed us to determine a mean field modulus of 2.3 and 2.1 kG from the Y- and K-band atomic lines respectively. These magnetic field measurements are essential for understanding environmental conditions within the AU Mic planetary system.
