The circumstellar disk of AB Aurigae: evidence for envelope accretion at late stages of star formation?
The circumstellar disk of AB Aurigae: evidence for envelope accretion at late stages of star formation?
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AB Aurigae 的星周盘：恒星形成后期包层吸积的证据？
DOI：
10.1051/0004-6361/201219414
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发表时间：
2012
影响因子：
6.5
通讯作者：
P. Ho
中科院分区：
文献类型：
--
作者：
Ya;S. Guilloteau;V. Piétu;A. Dutrey;N. Ohashi;P. Ho
目标。由于在相对年轻的阶段就明显存在螺旋，并且热尘埃发射中追踪到的不对称盘，御夫座AB的星周盘引起了人们的强烈关注。然而，螺旋的物理条件仍然没有得到很好的了解。不对称热发射的起源尚不清楚。方法。我们使用 IRAM 30-m、Plateau de Bure 干涉仪和亚毫米阵列在 230 GHz (1.3 mm) 的连续谱和谱线 12 CO J = 2 → 1 上观察圆盘，以对从 0. �� 37 到约 50 �� 的所有空间尺度进行采样。为了结合从这些望远镜获得的数据，检查和讨论了几种方法和校准问题。结果。 1.3 毫米连续介质（灰尘）发射被分解为内盘和外环。尘埃环的发射在方位角上高度不对称，强度变化为 3 倍。在恒星位置附近检测到由 CO 线追踪的高速分子气体。发现圆盘的倾斜角朝中心减小。在更大范围内，根据 12 CO J = 2 → 1 的强度加权色散和积分强度图，识别出四个螺旋，其中两个也在近红外中检测到。 4个螺旋的总气体质量(Mspiral)i s 10 -7 < Mspiral < 10 -5 M� ，比气环的质量小3个数量级。令人惊讶的是，螺旋内部的 CO 气体明显相对于 CO 盘反向旋转，并且仅表现出较小的径向运动。结论。宽阔的间隙、扭曲的圆盘和不对称的尘埃环表明存在一个未被检测到的伴星，其 ∞ ）
Aims. The circumstellar disk of AB Aurigae has garnered strong attention owing to the apparent existence of spirals at a relatively young stage and also the asymmetric disk traced in thermal dust emission. However, the physical conditions of the spirals are still not well understood. The origin of the asymmetric thermal emission is unclear. Methods. We observed the disk at 230 GHz (1.3 mm) in both the continuum and the spectral line 12 CO J = 2 → 1 with IRAM 30-m, the Plateau de Bure interferometer, and the SubMillimeter Array to sample all spatial scales from 0. �� 37 to about 50 �� . To combine the data obtained from these telescopes, several methods and calibration issues were checked and discussed. Results. The 1.3 mm continuum (dust) emission is resolved into inner disk and outer ring. The emission from the dust ring is highly asymmetric in azimuth, with intensity variations by a factor 3. Molecular gas at high velocities traced by the CO line is detected next to the stellar location. The inclination angle of the disk is found to decrease toward the center. On a larger scale, based on the intensity weighted dispersion and the integrated intensity map of 12 CO J = 2 → 1, four spirals are identified, where two of them are also detected in the near infrared. The total gas mass of the 4 spirals (Mspiral )i s 10 −7 < Mspiral < 10 −5 M� , which is 3 orders of magnitude smaller than the mass of the gas ring. Surprisingly, the CO gas inside the spiral is apparently counter-rotating with respect to the CO disk, and it only exhibits small radial motion. Conclusions. The wide gap, the warped disk, and the asymmetric dust ring suggest that there is an undetected companion with a ∞ )
DOI：
10.1146/annurev-astro-081811-125523
发表时间：
2012-03
影响因子：
33.3
作者：
W. Kley;R. Nelson
通讯作者：
W. Kley;R. Nelson