论文标题
LBT搜索AB Aurigae（前）过渡磁盘中的同伴和子结构
LBT search for companions and sub-structures in the (pre)transitional disk of AB Aurigae
论文作者
论文摘要
多波长的原星盘的高分辨率成像揭示了其灰尘和气体成分中存在多种多样的子结构，这可能是年轻的，形成的行星系统的路标。 Ab Aurigae具有象征性的（前）过渡性磁盘，显示在磁盘的内腔中观察到的螺旋结构（Alma; Alma; 1.3mm，$^{12} $ CO）和近膜（Sphere; Sphere; 1.5-2.5 $ $ M）波长，这些波长据称与动态相互作用相互作用。在这项工作中，我们介绍了新的深$ k_s $（2.16 $ $ m）和l'（3.7 $ $ $ m）的Ab Aurigae的频带图像，该图像在大型双筒望远镜上获得了LMIRCAM，旨在检测行星伴侣和Extended Disk结构。没有恢复任何点源，特别是在磁盘的外部区域，在该磁盘的外部区域（$ρ= 0.681“，pa = 7.6^{\ circ} $）。该系统的大小和质量的限制，从0.3''（49 au）降低到3-4 \ mjup，在0.6''（98 au）及以后，基于ATMO 2020的进化模型，我们还会检测到内部螺旋结构（<0.5'）。 （0.5-0.7英寸）显示明显的东南/西北不对称。这种结构首次在L'-band观察到，它仍然是ALMA看到的尘埃腔的内部，这表明磁盘中有效的灰尘诱捕机制。
Multi-wavelengths high-resolution imaging of protoplanetary disks has revealed the presence of multiple, varied substructures in their dust and gas components which might be signposts of young, forming planetary systems. AB Aurigae bears an emblematic (pre)transitional disk showing spiral structures observed in the inner cavity of the disk in both the sub-millimeter (ALMA; 1.3mm, $^{12}$CO) and near-infrared (SPHERE; 1.5-2.5$μ$m) wavelengths which have been claimed to arise from dynamical interactions with a massive companion. In this work, we present new deep $K_s$ (2.16$μ$m) and L' (3.7$μ$m) band images of AB Aurigae obtained with LMIRCam on the Large Binocular Telescope, aimed for the detection of both planetary companions and extended disk structures. No point source is recovered, in particular at the outer regions of the disk, where a putative candidate ($ρ= 0.681", PA = 7.6^{\circ}$) had been previously claimed. The nature of a second innermost planet candidate ($ρ= 0.16'', PA = 203.9^{\circ}$) can not be investigated by the new data. We are able to derive 5$σ$ detection limits in both magnitude and mass for the system, going from 14 \Mjup at 0.3'' (49 au) down to 3-4 \Mjup at 0.6'' (98 au) and beyond, based on the ATMO 2020 evolutionary models. We detect the inner spiral structures (< 0.5'') resolved in both CO and polarimetric H-band observations. We also recover the ring structure of the system at larger separation (0.5-0.7") showing a clear south-east/north-west asymmetry. This structure, observed for the first time at L'-band, remains interior to the dust cavity seen at ALMA, suggesting an efficient dust trapping mechanism at play in the disk.
