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arXiv 2301.01684astro-ph.EP
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在过渡盘中运动学检测到的行星候选者

A kinematically detected planet candidate in a transition disk

Jochen Stadler, Myriam Benisty, Andrés F. Izquierdo, Stefano Facchini, Richard Teague, Nicolas Kurtovic, Paola Pinilla, Jaehan Bae, Megan Ansdell, Ryan Loomis, … 展开作者

Jochen Stadler, Myriam Benisty, Andrés F. Izquierdo, Stefano Facchini, Richard Teague, Nicolas Kurtovic, Paola Pinilla, Jaehan Bae, Megan Ansdell, Ryan Loomis, Satoshi Mayama, Laura M. Pérez, Leonardo Testi

摘要:

过渡盘是原行星盘,其内部空腔可能被大质量的同伴清除,这使它们成为高分辨率观察的主要目标,以绘制其速度结构。我们目前ALMA带6尘埃和气体的过渡盘RXJ1604.3-2130 A,已知的功能几乎对称的阴影散射光的观测。我们研究了$^{12}$ CO线通道图和视线速度和峰值强度的矩图。我们拟合了开普勒模型的通道的通道发射研究线轮廓的差异,并产生所有速度分量的deprojected径向轮廓。$^{12}$ CO辐射在$\sim$ 56 au处和81 au处的尘埃连续环内有一个空腔。$^{12}$ CO谱线和尘埃连续谱中的方位角亮度变化与散射光观测中检测到的阴影大致一致。我们发现一个强大的本地化非开普勒功能向西连续环内(在$R=41\pm 10$ au和$PA=280\pm 2 ^\circ$)。还检测到一个紧密缠绕的螺旋,其在方位角上延伸超过300 $^\circ$,可能与局部非开普勒特征相连接。最后,弯曲的气体空腔内的等速等值线表示一个高度扰动的内部区域,可能与存在的错位的内部磁盘。虽然与散射光阴影大致一致,但局部非开普勒特征不能仅仅是由于温度的变化。相反,我们解释为跟踪一个大规模的同伴位于边缘的尘埃连续环的运动学特征。我们推测螺旋是由行星盘相互作用驱动的浮力共振引起的。然而,这个潜在的行星在$\sim$ 41 au不能解释气体耗尽的空腔,低吸积率和未对准的内盘,这表明存在另一个同伴更接近。

英文摘要:

Transition disks are protoplanetary disks with inner cavities possibly cleared by massive companions, which makes them prime targets to observe at high resolution to map their velocity structure. We present ALMA Band 6 dust and gas observations of the transition disk around RXJ1604.3-2130 A, known to feature nearly symmetric shadows in scattered light. We studied the $^{12}$CO line channel maps and moment maps of the line of sight velocity and peak intensity. We fitted a Keplerian model of the channel-by-channel emission to study line profile differences and produced deprojected radial profiles for all velocity components. The $^{12}$CO emission shows a cavity inwards of $\sim$56 au and within the dust continuum ring at 81 au. The azimuthal brightness variations in the $^{12}$CO line and dust continuum are broadly aligned with the shadows detected in scattered-light observations. We find a strong localized non-Keplerian feature toward the west within the continuum ring (at $R=41\pm 10$ au and $PA=280\pm 2 ^\circ$). A tightly wound spiral is also detected which extends over 300$^\circ$ in azimuth, possibly connected to the localized non-Keplerian feature. Finally, a bending of the iso-velocity contours within the gas cavity indicates a highly perturbed inner region, possibly related to the presence of a misaligned inner disk. While broadly aligned with the scattered-light shadows, the localized non-Keplerian feature cannot be solely due to changes in temperature. Instead, we interpret the kinematical feature as tracing a massive companion located at the edge of the dust continuum ring. We speculate that the spiral is caused by buoyancy resonances driven by planet-disk interactions. However, this potential planet at $\sim$41 au cannot explain the gas-depleted cavity, the low accretion rate, and the misaligned inner disk, which suggests the presence of another companion closer in.

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