标题： Subaru/CHARIS 高分辨率模式光谱学对棕矮星伴星 HD 33632 Ab 的研究 显示英文标题

标题： Subaru/CHARIS High-Resolution Mode Spectroscopy of the Brown Dwarf Companion HD 33632 Ab

摘要： 棕矮星（BD）在年龄和质量上是退化的模型。 在宿主恒星中，通过动力学和恒星年龄指标分别独立约束质量和年龄，对棕矮星伴星进行高对比度成像和光谱分析，为棕矮星演化模型提供了有价值的测试。 在本文中，我们展示了Subaru/CHARIS H波段和K波段对这样一个先前发现的系统HD 33632 Ab的新观测时期。 我们使用新获取的相对天体测量数据重新分析了质量和轨道，并将提取的光谱拟合到最新的平衡、非平衡和有云的棕矮星光谱和演化模型。 没有一个光谱模型与演化轨迹以及推导出的质量和年龄完全一致，而是更倾向于一个稍年轻的棕矮星，比宿主恒星推断的年龄更年轻。 这种矛盾可以通过同时考虑云和非平衡化学的大气和演化模型来解决，或者通过更高分辨率或其他波段的未来光谱数据来解决。 仅凭测光测量仍然与演化轨迹预测的亮度一致。 我们的工作强调了在将光谱模型与演化轨迹进行比较时，考虑诸如云、非平衡化学和成分等复杂性的重要性。 显示英文摘要

摘要： Brown dwarfs (BD) are model degenerate in age and mass. High-contrast imaging and spectroscopy of BD companions to host stars where the mass and age can be independently constrained by dynamics and stellar age indicators respectively provide valuable tests of BD evolution models. In this paper, we present a new epoch of Subaru/CHARIS H- and K-band observations of one such previously discovered system, HD 33632 Ab. We reanalyze the mass and orbit using our new epoch of extracted relative astrometry, and fit extracted spectra to the newest generation of equilibrium, disequilibrium, and cloudy spectral and evolution models for BDs. No spectral model perfectly agrees with evolutionary tracks and the derived mass and age, instead favoring a somewhat younger BD than the host star's inferred age. This tension can potentially be resolved using atmosphere and evolution models that consider both clouds and disequilibrium chemistry simultaneously, or by additional future spectra at higher resolution or in other band passes. Photometric measurements alone remain consistent with the luminosity predicted by evolutionary tracks. Our work highlights the importance of considering complexities like clouds, disequilibrium chemistry, and composition when comparing spectral models to evolutionary tracks.