外部或内部伴侣激发CQ Tau？
External or internal companion exciting the spiral arms in CQ Tau?
摘要：
我们提出了新的高对比度图像在近红外波长（$λ$ = 1.04，1.24，1.62，2.18和3.78 $μ$米）的年轻变星CQ Tau，旨在限制存在的同伴在原行星盘。我们达到了14个星等的KS波段对比度与SPHERE/IRDIS在分离大于0。“4星。我们的质量敏感性曲线排除了在$\sim$ 60 au处螺旋臂外的4 M $_{\rm Jup}$以上的巨行星，以及在100 au以上的2-3 M $_{\rm Jup}$以上的巨行星，置信度为5 $σ$（假设热启动模型）。然而，我们确实探测到了四个旋臂，一个双弧，以及由一个错位的内盘投射的散射光中的阴影的证据。我们的观测结果可以用一个看不见的近距离伴星在倾斜的偏心轨道上来解释。这种假设也可以解释椎间盘CO腔和运动学紊乱。
英文摘要：
We present new high-contrast images in near-infrared wavelengths ($λ$ = 1.04, 1.24, 1.62, 2.18 and 3.78$μ$m) of the young variable star CQ Tau, aiming to constrain the presence of companions in the protoplanetary disc. We reached a Ks-band contrast of 14 magnitudes with SPHERE/IRDIS at separations greater than 0."4 from the star. Our mass sensitivity curve rules out giant planets above 4 M$_{\rm Jup}$ immediately outside the spiral arms at $\sim$60 au and above 2-3 M$_{\rm Jup}$ beyond 100 au to 5$σ$ confidence assuming hot-start models. We do, however, detect four spiral arms, a double-arc and evidence for shadows in scattered light cast by a misaligned inner disc. Our observations may be explained by an unseen close-in companion on an inclined and eccentric orbit. Such a hypothesis would also account for the disc CO cavity and disturbed kinematics.
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