论文标题
阿尔玛（Alma
ALMA's view of the M-dwarf GSC 07396-00759's edge-on debris disc: AU Mic's coeval twin
论文作者
论文摘要
我们介绍了M1V星GSC 07396-00759周围的Edge-On碎屑盘7观察到新的ALMA频段。在〜20岁时，在Beta Pictoris移动组中，GSC 07396-00759将其加入了少数低质量M-dwarf碟片，以在Sub-Mm中解决。在先前的VLT/球体散射的光观测中，我们在恒星风力的影响下呈现系统内尘埃分布的多波长视图。我们发现，在70 au处的高斯圆环（fWHM为48 au），高斯圆环很好地描述了MM尘土晶粒，并且我们无法检测到系统中的CO存在。我们的ALMA模型半径明显小于偏振光散射光观测的半径，这意味着散射相函数中的复杂行为。在ALMA观察结果中未回收在散射光中观察到的椎间盘中的亮度不对称性，这意味着物理机制仅影响较小的晶粒尺寸。该系统的高分辨率随访观察结果将允许研究其独特的灰尘特征，并为其较小的兄弟姐妹au mic提供了真正的同时比较，在M-dwarfs系统中观察到了很好的观察。
We present new ALMA Band 7 observations of the edge-on debris disc around the M1V star GSC 07396-00759. At ~20 Myr old and in the beta Pictoris Moving Group along with AU Mic, GSC 07396-00759 joins it in the handful of low mass M-dwarf discs to be resolved in the sub-mm. With previous VLT/SPHERE scattered light observations we present a multi-wavelength view of the dust distribution within the system under the effects of stellar wind forces. We find the mm dust grains to be well described by a Gaussian torus at 70 au with a FWHM of 48 au and we do not detect the presence of CO in the system. Our ALMA model radius is significantly smaller than the radius derived from polarimetric scattered light observations, implying complex behaviour in the scattering phase function. The brightness asymmetry in the disc observed in scattered light is not recovered in the ALMA observations, implying that the physical mechanism only affects smaller grain sizes. High resolution follow-up observations of the system would allow investigation into its unique dust features as well as provide a true coeval comparison for its smaller sibling AU Mic, singularly well observed amongst M-dwarfs systems.
