论文标题
用IRDIS长距离光谱法表征棕色矮人的伴侣：HD 1160 B和HD 19467 B
Characterising brown dwarf companions with IRDIS long-slit spectroscopy: HD 1160 B and HD 19467 B
论文作者
论文摘要
棕色矮人伴侣的基本特性（质量，分离，年龄，重力和大气特性）的确定使我们能够推断出有关其形成和进化机制的重要信息。迄今为止，对于有限数量的对象（大部分在非常低的分辨率，r <50），由于技术限制，即对比度和角度分辨率，因此可以使用近来的companions的光谱。我们提出了中等分辨率（r = 350），冠状长期光谱光谱观测，具有两个近地点伴侣的球体，HD 1160 B和HD 19467B。我们发现HD 1160 B具有一个特殊的谱，在当前光谱库中无法拟合光谱。仅考虑Y+J和H光谱带，才有可能拟合。光谱类型在M5和M7之间。我们还估计T_EFF为2800-2900 K，log（g）为3.5-4.0 dex。对于这个物体，低表面重力似乎有利于年轻（10-20 Myr）和低质量（约20 m JUP）。 HD 19467 B是一个完全进化的对象，T_EFF为〜1000 K，log G为〜5.0 dex。它的光谱类型为T6 +/- 1。
The determination of the fundamental properties (mass, separation, age, gravity and atmospheric properties) of brown dwarf companions allows us to infer crucial informations on their formation and evolution mechanisms. Spectroscopy of substellar companions is available to date only for a limited number of objects (and mostly at very low resolution, R<50) because of technical limitations, i.e., contrast and angular resolution. We present medium resolution (R=350), coronagraphic long-slit spectroscopic observations with SPHERE of two substellar companions, HD 1160 B and HD 19467 B. We found that HD 1160 B has a peculiar spectrum that cannot be fitted by spectra in current spectral libraries. A good fit is possible only considering separately the Y+J and the H spectral band. The spectral type is between M5 and M7. We also estimated a T_eff of 2800-2900 K and a log(g) of 3.5-4.0 dex. The low surface gravity seems to favour young age (10-20 Myr) and low mass (~20 M Jup ) for this object. HD 19467 B is instead a fully evolved object with a T_eff of ~1000 K and log g of ~5.0 dex. Its spectral type is T6+/-1.
