论文标题
发现附近的年轻棕色矮人磁盘
Discovery of a Nearby Young Brown Dwarf Disk
论文作者
论文摘要
我们通过磁盘侦探公民科学项目报告了最年轻的棕色矮人，并从太阳的102 PC上发现了磁盘102 PC（WISEA〜J120037.79-784508.3（W1200-7845））。我们确定W1200-7845位于3.7 $ \ setack {+4.6 \\ -1.4} $ myr od od $ \ varepsilon $ 〜CHA协会中。它的光谱能分布（SED）表现出明确的红外（IR）过量证据，这表明存在温暖的杂质磁盘。对此温暖的磁盘进行建模，我们发现使用具有坡度$α= -0.94 $的幂律描述最适合数据，这表明它是一个年轻的II类式磁盘。使用单个黑体磁盘拟合，我们发现$ t_ {eff，disk} = 521 k $和$ l_ {ir}/l _ {*} = 0.14 $。 W1200-7845的近红外光谱与M6.0 $γ\ pm 0.5 $的光谱类型相匹配，该频谱与低表面重力对应相对应，并且缺乏强大的PA $β$或BR $γ$积聚的独特签名。我们的SED配件和光谱分析都表明源很酷（$ t_ {eff} = $ 2784-2850 K），质量为42-58 $ m_ {jup} $，良好在棕色矮人制度内。这个年轻的棕色矮人磁盘的接近度使该系统成为研究棕色矮人形成和早期进化的理想基准。
We report the discovery of the youngest brown dwarf with a disk at 102 pc from the Sun, WISEA~J120037.79-784508.3 (W1200-7845), via the Disk Detective citizen science project. We establish that W1200-7845 is located in the 3.7$\substack{+4.6 \\ -1.4}$ Myr-old $\varepsilon$~Cha association. Its spectral energy distribution (SED) exhibits clear evidence of an infrared (IR) excess, indicative of the presence of a warm circumstellar disk. Modeling this warm disk, we find the data are best fit using a power-law description with a slope $α= -0.94$, which suggests it is a young, Class II type disk. Using a single blackbody disk fit, we find $T_{eff, disk} = 521 K$ and $L_{IR}/L_{*} = 0.14$. The near-infrared spectrum of W1200-7845 matches a spectral type of M6.0$γ\pm 0.5$, which corresponds to a low surface gravity object, and lacks distinctive signatures of strong Pa$β$ or Br$γ$ accretion. Both our SED fitting and spectral analysis indicate the source is cool ($T_{eff} = $2784-2850 K), with a mass of 42-58 $M_{Jup}$, well within the brown dwarf regime. The proximity of this young brown dwarf disk makes the system an ideal benchmark for investigating the formation and early evolution of brown dwarfs.
