在富含气体的原行星盘内部区域CO耗尽的证据
Evidence for CO depletion in the inner regions of gas-rich protoplanetary disks
摘要：
本文研究了Herbig Ae/Be星HD 97048和HD 100546周围气盘中一氧化碳气体的物理性质和空间分布。使用高光谱分辨率4.588-4.715 $μ$ m的光谱，包含基本CO的排放与CRIRES采取的VLT，我们探测拱星气体和模型的运动学的发射线。通过对空间分辨目标进行光谱天体测量，我们限制了圆盘中发射区域的物理尺寸。我们解决，光谱和空间，$^{13}$ CO v（1-0）振动带和$^{12}$ CO $v=1-0, v=2-1, v=3-2$和$v=4-3$振动带的发射在两个目标，以及$^{12}$ CO $v=5-4$带在HD 100546。模拟的CO排放与均匀的磁盘在开普勒运动，产生一个最佳的拟合与内部和外部半径的CO排放区域的11和$\geq$ 100 AU的HD 97048。HD 100546与我们的模型拟合不好，但我们推导出内径的下限为8 AU。事实上，气体[OI]排放先前检测到在这两个目标在明显较小的半径表明，CO可能会被有效地破坏在小半径的表面层，这些磁盘
英文摘要：
We investigate the physical properties and spatial distribution of Carbon Monoxide (CO) gas in the disks around the Herbig Ae/Be stars HD 97048 and HD 100546. Using high-spectral-resolution 4.588-4.715 $μ$m spectra containing fundamental CO emission taken with CRIRES on the VLT, we probe the circumstellar gas and model the kinematics of the emission lines. By using spectro-astrometry on the spatially resolved targets, we constrain the physical size of the emitting regions in the disks. We resolve, spectrally and spatially, the emission of the $^{13}$CO v(1-0) vibrational band and the $^{12}$CO $v=1-0, v=2-1, v=3-2$ and $v=4-3$ vibrational bands in both targets, as well as the $^{12}$CO $v=5-4$ band in HD 100546. Modeling of the CO emission with a homogeneous disk in Keplerian motion, yields a best fit with an inner and outer radius of the CO emitting region of 11 and $\geq$ 100 AU for HD 97048. HD 100546 is not fit well with our model, but we derive a lower limit on the inner radius of 8 AU. The fact that gaseous [OI] emission was previously detected in both targets at significantly smaller radii suggests that CO may be effectively destroyed at small radii in the surface layers of these disks
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