ACCRETION KINEMATICS THROUGH THE WARPED TRANSITION DISK IN HD 142527 FROM RESOLVED CO(6–5) OBSERVATIONS
ACCRETION KINEMATICS THROUGH THE WARPED TRANSITION DISK IN HD 142527 FROM RESOLVED CO(6–5) OBSERVATIONS
复制标题
根据解析的 CO(6–5) 观测结果通过 HD 142527 中的扭曲过渡盘吸积运动学
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
M. Montesinos
中科院分区：
文献类型：
--
作者：
S. Casassus;S. Marino;S. Pérez;P. Roman;A. Dunhill;P. Armitage;J. Cuadra;A. Wootten;G. V. D. Plas;L. Cieza;V. Moral;V. Christiaens;M. Montesinos
在HD 142527盘的大中央空腔中发现的残余气体激发了关于其非开普勒运动学起源以及与行星形成可能联系的问题。我们的目标是了解的物理结构的基础上的腔内气体流动，指导下的新的分子线数据在CO（6-5）与前所未有的角分辨率。鉴于扭曲的结构推断从识别的散射光投射在外盘上的阴影，运动学是一致的，一阶，轴对称吸积到内盘发生在所有方位角。一个稳态的吸积配置文件，固定在恒星吸积率，解释了腔的深度跟踪在CO同位素。HD 142527中的突然翘曲和近自由落体径向流的证据类似于磁盘撕裂的理论模型，这可能是由报告的低质量伴星驱动的，其轨道可能包含在内盘的平面内。伴星相对于大质量外盘的高倾角可能会在很长的时间尺度上驱动Kozai振荡;高偏心率周期可能是大空洞的原因。虽然倾斜圆盘的阴影可能会在分子线图中留下方位角调制的印记，但需要进一步的观察才能确定HD 142527腔内密度场中方位角结构的重要性。
The finding of residual gas in the large central cavity of the HD 142527 disk motivates questions regarding the origin of its non-Keplerian kinematics and possible connections with planet formation. We aim to understand the physical structure that underlies the intra-cavity gaseous flows, guided by new molecular-line data in CO(6–5) with unprecedented angular resolutions. Given the warped structure inferred from the identification of scattered-light shadows cast on the outer disk, the kinematics are consistent, to first order, with axisymmetric accretion onto the inner disk occurring at all azimuths. A steady-state accretion profile, fixed at the stellar accretion rate, explains the depth of the cavity as traced in CO isotopologues. The abrupt warp and evidence for near free-fall radial flows in HD 142527 resemble theoretical models for disk tearing, which could be driven by the reported low-mass companion, whose orbit may be contained in the plane of the inner disk. The companion’s high inclination with respect to the massive outer disk could drive Kozai oscillations over long timescales; high-eccentricity periods may perhaps account for the large cavity. While shadowing by the tilted disk could imprint an azimuthal modulation in the molecular-line maps, further observations are required to ascertain the significance of azimuthal structure in the density field inside the cavity of HD 142527.
混沌恒星的形成以及恒星旋转与盘和行星轨道轴的对齐
DOI：
10.1111/j.1365-2966.2009.15773.x
发表时间：
2010
影响因子：
4.8
作者：
Bate M
通讯作者：
Bate M