标题： 影像围绕V4046 Sgr双幼年太阳运转的分子盘 显示英文标题

标题： Imaging the Molecular Disk Orbiting the Twin Young Suns of V4046 Sgr

摘要： 我们利用亚毫米波阵列（SMA）以约2"的角分辨率对附近的（距离约73 pc）、约12 Myr的古典T Tauri双星系统V4046 Sgr进行了观测。 我们探测到在12CO(2-1)和13CO(2-1)发射线中的旋转盘，并解析了1.3 mm的连续谱辐射。 我们推断盘的气体和尘埃质量分别约为110个地球质量和40个地球质量。 幂律盘模型拟合表明，分子盘延伸至约370 AU，并且对于动态恒星质量从1.8 $M_\odot$到1.5 $M_\odot$（之前确定的中心双星系统的总质量范围）时，盘的倾角在约33度到约39度之间。 这个倾角范围与推断中心双星质量所假设的倾角（即35度）一致，表明V4046 Sgr双星系统及其周围的分子盘是共面的。 鉴于系统的年龄和双星特性，围绕V4046 Sgr存在一个广泛的分子盘，这为与木星行星形成相关的物理过程提供了时间尺度限制，并表明围绕紧密双星系统的木星行星可能形成。 显示英文摘要

摘要： We have imaged the disk surrounding the nearby (D~73 pc), ~12 Myr, classical T Tauri binary system V4046 Sgr with the Submillimeter Array (SMA) at an angular resolution of ~2". We detect a rotating disk in 12CO(2-1) and 13CO(2-1) emission, and resolve the continuum emission at 1.3 mm. We infer disk gas and dust masses of ~110 and ~40 Earth masses, respectively. Fits to a power-law disk model indicate that the molecular disk extends to ~370 AU and is viewed at an inclination of between ~33 and ~39 degrees for dynamical stellar masses ranging from 1.8 $M_\odot$ down to 1.5 $M_\odot$ (the range of total mass previously determined for the central, 2.4 day spectroscopic binary). This range of disk inclination is consistent with that assumed in deducing the central binary mass (i.e., 35 degrees), suggesting that the V4046 Sgr binary system and its circumbinary, molecular disk are coplanar. In light of the system's age and binarity, the presence of an extensive molecular disk orbiting V4046 Sgr provides constraints on the timescales of processes related to Jovian planet formation, and demonstrates that circumbinary Jovian planets potentially could form around close binary systems.