论文标题
丹尼斯J063001.4 $ - $ 184014AB的个体动态质量揭示了可能年轻的棕色矮人三重
Individual Dynamical Masses of DENIS J063001.4$-$184014AB Reveal A Likely Young Brown Dwarf Triple
论文作者
论文摘要
M8.5矮人Denis J063001.4 $ - $ 184014AB（DE0630 $ - $ 18）的二进制性质是通过从地面监测的，确定未解决的光中心轨道和系统的三方差异。在这里，我们介绍了带有凯克孔掩模的近红外的径向速度监测和解决的观测值，从而使我们能够测量系统的相对分离和亮度。通过结合所有可用信息，我们确定二进制组件的个体动态质量为$ m_1 = 0.052^{+0.009} _ { - 0.008} M_ \ Mathrm {Sunrm {Sunrm {Sunrm {Sunrm {Sunrm {sun} $和$ m_2 = 0.052 = 0.052^{+0.005} _ { - 0.005} _ { - 0.004} M_ {-0.004} M_______政权。鉴于对象的M8.5光谱类型和等效的绝对幅度以及组件之间亮度的显着差异（$δ{k} $ = 1.74 $ \ pm $ 0.06 mag），这些质量令人惊讶。我们的结果表明，DE0630 $ - $ 18是一个相对年轻的系统（$ \ sim $ 200 MYR），其辅助组件本身就是潜在的未解决的二进制。
The binary nature of the M8.5 dwarf DENIS J063001.4$-$184014AB (DE0630$-$18) was discovered with astrometric monitoring from the ground, which determined the unresolved photocentric orbit and the trigonometric parallax of the system. Here we present radial-velocity monitoring and resolved observations in the near-infrared with Keck aperture masking that allow us to measure the system's relative separation and brightness. By combining all available information, we determine the individual dynamical masses of the binary components to be $M_1 = 0.052^{+0.009}_{-0.008} M_\mathrm{Sun}$ and $M_2 = 0.052^{+0.005}_{-0.004} M_\mathrm{Sun}$, both firmly in the substellar regime. These masses are surprising given the object's M8.5 optical spectral type and equivalent absolute magnitude, and the significant difference in brightness between the components ($Δ{K}$ = 1.74$\pm$0.06 mag). Our results suggest that DE0630$-$18 is a relatively young system ($\sim$200 Myr) with a secondary component that is itself a potentially unresolved binary.
