寻找亚恒星质量的伴星和它们的母盘中的不对称性
Search for substellar-mass companions and asymmetries in their parent discs
摘要：
过渡盘是一类围绕年轻恒星的星周盘，在10秒的金尺度上，其内部区域的尘埃物质被广泛清除。这种清理的主要候选者之一是在圆盘内形成行星，然后当它们通过圆盘迁移时，它们的直接区域被吸积或清理。我们的样本包括8个过渡盘。使用凯克/NIRC 2仪器，我们利用稀疏孔径掩模（SAM）干涉测量技术，以寻找不对称的指示正在进行的行星形成。我们使用模型拟合和干涉图像重建技术来寻找近距离的同伴。使用模拟数据，我们得出的诊断，帮助我们区分点源和扩展的非对称光盘发射。此外，我们研究了退化之间的对比度和分离，出现边缘解决的同伴。我们发现FP Tau含有以前看不见的盘壁，DM Tau、LkHa 330和TW Hya含有指示点源样发射的不对称信号。我们对RXJ1842.9-3532和V2246 Oph中的伴星的对比度设置了上限。我们裁定RXJ1615.3-3255和V2062 Oph中的不对称信号为假阳性。在我们的数据表明潜在伴侣的情况下，我们计算了$M_c \dot M_c$值的估计值，并发现值在$10^{-5} - 10^{-3} M^2_J yr^{-1}$的范围内。我们在四个目标中发现了显著的不对称性。其中，有三个与同伴一致。我们解决了一个以前看不见的差距，在光盘的FP头向内延伸约10 AU。
英文摘要：
Transitional discs are a class of circumstellar discs around young stars with extensive clearing of dusty material within their inner regions on 10s of au scales. One of the primary candidates for this kind of clearing is the formation of planet(s) within the disc that then accrete or clear their immediate area as they migrate through the disc. Our sample included eight transitional discs. Using the Keck/NIRC2 instrument we utilised the Sparse Aperture Masking (SAM) interferometry technique to search for asymmetries indicative of ongoing planet formation. We searched for close-in companions using both model fitting and interferometric image reconstruction techniques. Using simulated data, we derived diagnostics that helped us to distinguish between point sources and extended asymmetric disc emission. In addition, we investigated the degeneracy between the contrast and separation that appear for marginally resolved companions. We found FP Tau to contain a previously unseen disc wall, and DM Tau, LkHa 330, and TW Hya to contain an asymmetric signal indicative of point source-like emission. We placed upper limits on the contrast of a companion in RXJ1842.9-3532 and V2246 Oph. We ruled the asymmetry signal in RXJ1615.3-3255 and V2062 Oph to be false positives. In the cases where our data indicated a potential companion we computed estimates for the value of $M_c \dot M_c$ and found values in the range of $10^{-5} - 10^{-3} M^2_J yr^{-1}$. We found significant asymmetries in four targets. Of these, three were consistent with companions. We resolved a previously unseen gap in the disc of FP Tau extending inwards from approximately 10 au.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
