论文标题
阿尔玛图像偏心高清53143碎片磁盘
ALMA Images the Eccentric HD 53143 Debris Disk
论文作者
论文摘要
我们提出了HD〜53143碎片磁盘的ALMA 1.3 mm观察结果 - 该〜1个gyr-gyl Solar-Analogue产生的第一批红外或毫米图。以前的HST性肺炎冠状成像未检测到沿磁盘的次要轴的通量，这可能暗示带有两个“团块”灰尘的面对面的几何形状。这些ALMA观察结果揭示了一个具有截然不同的结构的磁盘。为了将模型拟合到毫米可见性并限制对磁盘参数的不确定性，我们采用了MCMC方法。这是迄今为止观察到的最古怪的杂物盘，其强制偏心率为0.21 \ pm0.02 $，几乎是Fomalhaut碎片磁盘的两倍，并且还显示了Apocenter Glow。尽管该偏心模型符合外碎屑盘很好地拟合，但仍有明显的内部残留物，可能表明可能具有边缘的内盘，这些磁盘在这些观察结果中仍未解决。结合观察到的HST和ALMA之间的结构差异，这些结果表明在该系统中可能存在先前的散射事件或动态不稳定性。我们还注意到，在观测过程中，恒星通量发生了很大变化，表明在毫米波长下燃烧。使用同时的苔丝观察，我们确定恒星轮换期为$ 9.6 \ pm0.1 $天。
We present ALMA 1.3 mm observations of the HD~53143 debris disk - the first infrared or millimeter image produced of this ~1 Gyr-old solar-analogue. Previous HST STIS coronagraphic imaging did not detect flux along the minor axis of the disk which could suggest a face-on geometry with two 'clumps' of dust. These ALMA observations reveal a disk with a strikingly different structure. In order to fit models to the millimeter visibilities and constrain the uncertainties on the disk parameters, we adopt an MCMC approach. This is the most eccentric debris disk observed to date with a forced eccentricity of $0.21\pm0.02$, nearly twice that of the Fomalhaut debris disk, and also displays apocenter glow. Although this eccentric model fits the outer debris disk well, there are significant interior residuals remaining that may suggest a possible edge-on inner disk, which remains unresolved in these observations. Combined with the observed structure difference between HST and ALMA, these results suggest a potential previous scattering event or dynamical instability in this system. We also note that the stellar flux changes considerably over the course of our observations, suggesting flaring at millimeter wavelengths. Using simultaneous TESS observations, we determine the stellar rotation period to be $9.6\pm0.1$ days.
