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arXiv 0811.3941astro-ph
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2006年蛇夫座RS爆发非对称冲击波的三维模拟:早期X射线发射

Three-dimensional modeling of the asymmetric blast wave from the 2006 outburst of RS Ophiuchi: Early X-ray emission

S. Orlando, J. J. Drake, J. M. Laming

摘要:

钱德拉/HETG在其2006年爆发的第13.9天对经常性新星RS Ophiuchi的观测揭示了一个覆盖等离子体温度大范围的光谱,其特征是不对称和蓝移的发射线。我们调查的起源,这些不对称性和扩大的发射线。我们进行3-D流体动力学模拟的冲击波从2006年爆发,通过非均匀CSM传播。该模型考虑了热传导(包括热流饱和的影响)和辐射冷却。从模拟中,我们合成了X射线发射,并推导出光谱,因为它们将与钱德拉/HETG观察。我们的模型再现所观察到的X射线发射在一个自然的方式,如果CSM的爆发发生的特点是赤道密度增强。我们的"最佳拟合“模型预测,大多数早期X射线发射起源于一个小区域,该区域在垂直于视线的方向上传播,并位于爆炸波和赤道密度增强之间的相互作用前沿后面。该模型预测的不对称和蓝移线轮廓非常相似的观察。这些不对称是由于喷出物材料对红移发射的大量X射线吸收。Chandra/HETG的高质量数据与详细的流体动力学模型的比较,使我们能够揭开,第一次,在X射线波段的结构发射的细节,在爆发演化的早期阶段,有助于更好地了解物理之间的相互作用的新星爆炸和CSM经常性新星。这可能对RS Ophiuchi是否是Ia型SN祖系统有影响。

英文摘要:

Chandra/HETG observations of the recurrent nova RS Ophiuchi at day 13.9 of its 2006 outburst reveal a spectrum covering a large range in plasma temperature and characterized by asymmetric and blue-shifted emission lines. We investigate the origin of these asymmetries and broadening of emission lines. We perform 3-D hydrodynamic simulations of the blast wave from the 2006 outburst, propagating through the inhomogeneous CSM. The model takes into account the thermal conduction (including the effects of heat flux saturation) and the radiative cooling. From the simulations, we synthesize the X-ray emission and derive the spectra as they would be observed with Chandra/HETG. Our model reproduces the observed X-ray emission in a natural way if the CSM in which the outburst occurred is characterized by an equatorial density enhancement. Our ``best-fit'' model predicts that most of the early X-ray emission originates from a small region propagating in the direction perpendicular to the line-of-sight and localized just behind the interaction front between the blast wave and the equatorial density enhancement. The model predicts asymmetric and blue-shifted line profiles remarkably similar to those observed. These asymmetries are due to substantial X-ray absorption of red-shifted emission by ejecta material. The comparison of high quality data of Chandra/HETG with detailed hydrodynamic modeling has allowed us to unveil, for the first time, the details of the structure emitting in the X-ray band in early phases of the outburst evolution, contributing to a better understanding of the physics of interactions between nova blasts and CSM in recurrent novae. This may have implications for whether or not RS Ophiuchi is a Type Ia SN progenitor system.

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