On the cavity of a debris disc carved by a giant planet
On the cavity of a debris disc carved by a giant planet
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在一颗巨大行星雕刻的碎片盘的空腔上
DOI：
10.1093/mnras/stx2604
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发表时间：
2017
影响因子：
4.8
通讯作者：
T. Kovács
中科院分区：
文献类型：
--
作者：
Z. Regály;Z. Dencs;A. Moór;T. Kovács
对于碎片盘内的空洞，一个可能的解释是一颗嵌入其中的巨行星的引力扰动。经过大质量天体附近的星子会被动态地搅动，从而形成一个被称为混沌带的清晰区域。重叠平均运动共振理论预测了该空腔的宽度。为了测试这个空腔是否与混沌区相同，我们通过无碰撞n体模拟来研究空腔的形成，假设一个质量为1.25-10木星的行星，离心率为0-0.9。在毫米波长的合成图像计算，以确定腔的性质拟合到14%的轮廓水平的椭圆。根据行星的离心率e_pl，椭圆腔壁随着行星的轨道旋转，其周期与行星相同（e_pl 0.2）。空腔中心沿着行星的半长轴与恒星的偏移距离为d=0.1q^-0.17e_pl^0.5，以空腔大小为单位，向行星的公转轨道偏移，其中q是行星与恒星的质量比。当e_pl为0.1时，出现中心周围发光（apocentre），而两者分别在0.05 ~ 0.05时出现。空腔偏心率e_cav仅在0.3<=e_pl<=0.6时与行星的偏心率相等。给出了一种基于ALMA观测数据估算空腔行星轨道参数和质量的新方法。
One possible explanation of the cavity in debris discs is the gravitational perturbation of an embedded giant planet. Planetesimals passing close to a massive body are dynamically stirred resulting in a cleared region known as the chaotic zone. Theory of overlapping mean-motion resonances predicts the width of this cavity. To test whether this cavity is identical to the chaotic zone, we investigate the formation of cavities by means of collisionless N-body simulations assuming a 1.25-10 Jupiter mass planet with eccentricities of 0-0.9. Synthetic images at millimetre wavelengths are calculated to determine the cavity properties by fitting an ellipse to 14 percent contour level. Depending on the planetary eccentricity, e_pl, the elliptic cavity wall rotates as the planet orbits with the same (e_pl 0.2) period that of the planet. The cavity centre is offset from the star along the semi-major axis of the planet with a distance of d=0.1q^-0.17e_pl^0.5 in units of cavity size towards the planet's orbital apocentre, where q is the planet-to-star mass ratio. Pericentre (apocentre) glow develops for e_pl 0.1), while both are present for 0.05 0.05, respectively. The cavity eccentricity, e_cav, equals to that of the planet only for 0.3<=e_pl<=0.6. A new method based on ALMA observations for estimating the orbital parameters and mass of the planet carving the cavity is also given.
观察碎片盘中的行星盘相互作用
影响因子：
6.5
作者：
S. Ertel;S. Wolf;J. Rodmann
通讯作者：
J. Rodmann