论文标题
上天蝎座和奥菲丘斯的自由浮动行星候选的红外光谱
Infrared Spectroscopy of free-floating planet candidates in Upper Scorpius and Ophiuchus
论文作者
论文摘要
背景：最近在Scorpius和Ophiuchus Star形成的复合体中，已经报道了大量的低质量棕色矮人和孤立的行星质量物体。目的：我们使用低分辨率近红外光谱研究了这些孤立的行星群众候选者中17个的成员，性质和性质。方法：我们通过使用四个诊断的年轻人来研究成员资格：J和KS频段之间的连续体斜率，HCONT和TLI-G GREATITY敏感索引，以及将光谱与年轻和田间（旧）和野生范围（旧）和L-Dwarf标准进行比较。结果：根据进化模型，所有目标以外的所有目标都被确认为年轻的Ultracool物体，在L0和L6之间的光谱类型在0.004-0.013 m的范围内。目前尚不清楚最后一个目标的状态。结论：在17个目标中仅确定了一种可能的污染物，这表明原始样品的污染水平必须低于6％
Context: A rich population of low-mass brown dwarfs and isolated planetary mass objects has been reported recently in the Upper Scorpius and Ophiuchus star forming complex. Aims: We investigate the membership, nature and properties of 17 of these isolated planetary mass candidates using low-resolution near-infrared spectra. Methods: We investigate the membership by looking for evidences of youth using four diagnostics: the slope of the continuum between the J and Ks band, the Hcont and TLI-g gravity sensitive indices, and by comparing the spectra to young and field (old) M and L-dwarf standards. Results: All the targets but one are confirmed as young ultracool objects, with spectral types between L0 and L6 and masses in the range 0.004-0.013 M according to evolutionary models. The status of the last target is unclear at this point. Conclusions: Only one possible contaminant has been identified among the 17 targets, suggesting that the contamination level of the original sample must be lower than 6%
