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arXiv 1209.0591astro-ph.SRastro-ph.EP
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FUV和X射线辐照的原行星盘:II模型网格.气体诊断线发射

FUV and X-ray irradiated protoplanetary disks: a grid of models II - Gas diagnostic line emission

Giambattista Aresu, Rowin Meijerink, Inga Kamp, Marco Spaans, Wing-Fai Thi, Peter Woitke

摘要:

原行星盘中的大部分物质都是以气体的形式存在。气体及其诊断的研究是至关重要的,以实现磁盘的热和化学结构的详细描述。来自中心恒星的辐射(从光学到X射线波长)和粘性吸积是主要的能量来源,并在其早期阶段主导着盘的物理和化学。这就是行星形成的第一阶段将要进行的环境。我们研究恒星和磁盘参数如何影响精细结构冷却线[NeII],[ArII],[OI],[CII]和H2O旋转线在磁盘中。这些线是潜在的强大的磁盘结构的诊断和他们的建模允许进行彻底的解释与仪器设施,如斯皮策和赫歇尔的意见。根据Aresu等人(2011年)的研究,我们计算了一个由240个圆盘模型组成的网格,其中X射线光度、紫外线过量光度、最小尘埃粒度、尘埃粒度分布幂律和表面密度分布幂律系统地变化。我们解决自洽的磁盘垂直流体静力学结构在每个模型和应用详细的线辐射转移计算线通量和配置文件的一系列著名的中红外和远红外冷却线。当LX <1 e 30 erg/s时,[OI] 63 μ m线通量随FUV亮度的增加而增加;当LX > 1 e 30 erg/s时,[OI] 63 μ m线通量随X射线亮度的增加而增加。[CII]157微米主要由FUV光度通过C+产生驱动,X射线对线通量的影响较小。[NeII] 12.8微米与X射线相关;从盘大气发射的线轮廓显示出一个双峰分量,由静态盘大气中的发射引起,紧挨着高速双峰分量,由非常内部边缘的发射引起。(节略)

英文摘要:

Most of the mass in protoplanetary disks is in the form of gas. The study of the gas and its diagnostics is of fundamental importance in order to achieve a detailed description of the thermal and chemical structure of the disk. The radiation from the central star (from optical to X-ray wavelengths) and viscous accretion are the main source of energy and dominates the disk physics and chemistry in its early stages. This is the environment in which the first phases of planet formation will proceed. We investigate how stellar and disk parameters impact the fine-structure cooling lines [NeII], [ArII], [OI], [CII] and H2O rotational lines in the disk. These lines are potentially powerful diagnostics of the disk structure and their modelling permits a thorough interpretation of the observations carried out with instrumental facilities such as Spitzer and Herschel. Following Aresu et al. (2011), we computed a grid of 240 disk models, in which the X-ray luminosity, UV-excess luminosity, minimum dust grain size, dust size distribution power law and surface density distribution power law, are systematically varied. We solve self-consistently for the disk vertical hydrostatic structure in every model and apply detailed line radiative transfer to calculate line fluxes and profiles for a series of well known mid- and far-infrared cooling lines. The [OI] 63 micron line flux increases with increasing FUV luminosity when Lx < 1e30 erg/s, and with increasing X-ray luminosity when LX > 1e30 erg/s. [CII] 157 micron is mainly driven by FUV luminosity via C+ production, X-rays affect the line flux to a lesser extent. [NeII] 12.8 micron correlates with X-rays; the line profile emitted from the disk atmosphere shows a double-peaked component, caused by emission in the static disk atmosphere, next to a high velocity double-peaked component, caused by emission in the very inner rim. (abridged)

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