arXiv 1107.30412011-07-15astro-ph.GAastro-ph.SR

引力不稳定原行星盘中的化学

Chemistry in a gravitationally unstable protoplanetary disc

J. D. Ilee, A. C. Boley, P. Caselli, R. H. Durisen, T. W. Hartquist, J. M. C. Rawlings

备注：: 10 figures and 3 tables, accepted for publication in MNRAS
DOI：: 10.1111/j.1365-2966.2011.19455.x

摘要：

到目前为止，轴对称的α圆盘模型已经被用来计算原行星圆盘的化学成分。虽然这种方法对许多圆盘是合理的，但当自重很重要时，这种方法就不合适了。在这种情况下，螺旋波和冲击会引起温度和密度的变化，从而影响化学反应。我们已经通过了一个动力学模型的太阳质量的恒星周围的大规模（0.39 Msun），自引力盘，类似于那些可能会发现周围的0类和早期的I类原恒星，在光盘化学的研究。我们发现，对于每一个物种的数量，例如H2O，吸附和解吸占主导地位的变化，在气相分数丰度，因为解吸率是非常敏感的温度，从这些物种的排放地图应揭示不同强度的冲击的位置。气相分数丰度的一些其他物种，如CS，也受到气相反应，特别是在温暖的冲击区。我们的结论是，大规模光盘的动态有很大的影响，他们如何出现时，在各种分子种类的发射线成像。

英文摘要：

Until now, axisymmetric, alpha-disc models have been adopted for calculations of the chemical composition of protoplanetary discs. While this approach is reasonable for many discs, it is not appropriate when self-gravity is important. In this case, spiral waves and shocks cause temperature and density variations that affect the chemistry. We have adopted a dynamical model of a solar-mass star surrounded by a massive (0.39 Msun), self-gravitating disc, similar to those that may be found around Class 0 and early Class I protostars, in a study of disc chemistry. We find that for each of a number of species, e.g. H2O, adsorption and desorption dominate the changes in the gas-phase fractional abundance; because the desorption rates are very sensitive to temperature, maps of the emissions from such species should reveal the locations of shocks of varying strengths. The gas-phase fractional abundances of some other species, e.g. CS, are also affected by gas-phase reactions, particularly in warm shocked regions. We conclude that the dynamics of massive discs have a strong impact on how they appear when imaged in the emission lines of various molecular species.

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