晚型矮星光谱多重性的微妙特征：未分辨的M8 + T5双星2 MASS J03202839-0446358
Subtle Signatures of Multiplicity in Late-type Dwarf Spectra: The Unresolved M8.5 + T5 Binary 2MASS J03202839-0446358
摘要：
2 MASS J 03202839 -0446358是一颗光学（M8：）和近红外（L1）光谱类型不一致的晚型矮星，它是一颗具有晚型M矮星和T矮星成分的恒星/棕矮星双星。这一结论是基于低分辨率的近红外光谱法，该光谱法揭示了1.6微米处微妙但独特的吸收特征。该特征也存在于M8.5 + T6二元SCR 1845-6357的组合光谱中，其产生于来自M8.5初级的FeH吸收和来自T5+/-1次级的伪连续通量的组合，如根据经验数据构建的二元光谱模板所确定的。与任何单一比较光谱相比，二进制模板提供了与2 MASS J 0320 -0446的整体近红外光谱能量分布的远优于匹配。激光导星自适应光学（LGS AO）成像观测，包括首次应用LGS AO孔径掩模干涉测量法，未能解决一个微弱的同伴，限制了系统的投影分离小于8.3 AU在观测时。2 MASS J 0320 -0446是第二个通过未解析、低分辨率、近红外光谱技术识别的极低质量双星，该技术补充了传统的高分辨率成像和光谱方法。
英文摘要：
Evidence is presented that 2MASS J03202839-0446358, a late-type dwarf with discrepant optical (M8:) and near-infrared (L1) spectral types, is an as-yet unresolved stellar/brown dwarf binary with late-type M dwarf and T dwarf components. This conclusion is based on low-resolution, near-infrared spectroscopy that reveals a subtle but distinctive absorption feature at 1.6 micron. The feature, which is also present in the combined light spectrum of the M8.5 + T6 binary SCR 1845-6357, arises from the combination of FeH absorption from an M8.5 primary and pseudo-continuum flux from a T5+/-1 secondary, as ascertained from binary spectral templates constructed from empirical data. The binary templates provide a far superior match to the overall near-infrared spectral energy distribution of 2MASS J0320-0446 than any single comparison spectra. Laser guide star adaptive optics (LGS AO) imaging observations, including the first application of LGS AO aperture mask interferometry, fail to resolve a faint companion, restricting the projected separation of the system to less than 8.3 AU at the time of observation. 2MASS J0320-0446 is the second very low mass binary to be identified from unresolved, low-resolution, near-infrared spectroscopy, a technique that complements traditional high resolution imaging and spectroscopic methods.
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