论文标题
与Alma的原月经磁盘MWC 758中偏心率的运动学约束
Kinematical Constraint on Eccentricity in the Protoplanetary Disk MWC 758 with ALMA
论文作者
论文摘要
我们分析了$^{13} \ Mathrm {Co} $和$ \ Mathrm {C}^{18} \ Mathrm {O} $ j = 3-2 $发射线的档案数据在磁盘中。我们对观测数据进行了开普勒磁盘模型的拟合，并测量了与开普勒旋转的速度偏差。我们发现MWC 758磁盘内部腔周围的速度偏差明显。我们检查了可能导致速度偏差的几种可能性，例如压力梯度，发射层的高度，插入式运动，内部扭曲和磁盘中的偏心率。我们发现，在内腔半径上，偏心轨道运动与偏心率为0.1 \ pm0.04 $的组合最能解释观察到的速度偏差。我们的气轨道运动的运动学约束偏心率接近内部空腔，这与亚毫米连续发射中测得的内腔周围的灰尘环的偏心率一致。我们的结果暗示，在MWC 758磁盘中内部腔内内部腔内的强烈尘埃气耦合以及气体巨型行星的存在。
We analyzed the archival data of the $^{13}\mathrm{CO}$ and $\mathrm{C}^{18}\mathrm{O}$ $J=3-2$ emission lines in the protoplanetary disk around MWC 758 obtained with the Atacama Large Millimeter/submillimeter Array to discuss possible planet-disk interaction and non-Keplerian motion in the disk. We performed fitting of a Keplerian disk model to the observational data and measured the velocity deviations from the Keplerian rotation. We found significant velocity deviations around the inner cavity in the MWC 758 disk. We examined several possibilities that may cause the velocity deviations, such as pressure gradient, height of the emitting layer, infall motion, inner warp, and eccentricity in the disk. We found that the combination of an eccentric orbital motion with eccentricity of $0.1\pm0.04$ at the radius of the inner cavity and an infalling flow best explains the observed velocity deviations. Our kinematically constrained eccentricity of the gas orbital motion close to the inner cavity is consistent with the eccentricity of the dust ring around the inner cavity measured in the submillimeter continuum emission. Our results hint at strong dust-gas coupling around the inner cavity and presence of a gas giant planet inside the inner cavity in the MWC 758 disk.
