AU Mic的大兄弟：$β$ Pic移动群中CP-72 2713周围的冷尘埃丰富的碎片盘
The big sibling of AU Mic: a cold dust-rich debris disk around CP-72 2713 in the $β$ Pic moving group
摘要：
分析斯皮策和赫歇尔的档案测量，我们确定了年轻的K7/M0恒星CP-72 2713周围的碎片盘。该系统属于2400万年前的$β$ Pic移动组。我们的新的1.33毫米连续观测，获得了ALMA 7米阵列，揭示了一个扩展的尘埃盘，峰值半径为140 au，可能跟踪的位置的星子带在系统中。与已知的空间分辨碎片盘和质量相当的恒星周围的原行星盘相比，这个盘非常大。人们发现，该半径处的带的动力学激发与行星搅拌是一致的，而嵌入带中的大微行星的自搅拌只有在这些天体非常迅速地形成（例如通过卵石聚集）时才能起作用。通过对光谱能量分布的分析，我们得到了43 K的特征尘埃温度和1.1 $\times$ × 10 $^{-3}$的分光度。后一个值非常高，我们只知道其他四个类似的富含尘埃的柯伊伯带类似物在太阳的40 pc范围内。
英文摘要：
Analyzing Spitzer and Herschel archival measurements we identified a debris disk around the young K7/M0 star CP-72 2713. The system belongs to the 24Myr old $β$ Pic moving group. Our new 1.33mm continuum observation, obtained with the ALMA 7-m array, revealed an extended dust disk with a peak radius of 140au, probably tracing the location of the planetesimal belt in the system. The disk is outstandingly large compared to known spatially resolved debris disks and also to protoplanetary disks around stars of comparable masses. The dynamical excitation of the belt at this radius is found to be reconcilable with planetary stirring, while self-stirring by large planetesimals embedded in the belt can work only if these bodies form very rapidly, e.g. via pebble concentration. By analyzing the spectral energy distribution we derived a characteristic dust temperature of 43K and a fractional luminosity of 1.1$\times$10$^{-3}$. The latter value is prominently high, we know only four other similarly dust-rich Kuiper-belt analogs within 40pc of the Sun.
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