连接RS OPh到[一些] Ia型超新星
Connecting RS OPh to [some] Type Ia Supernovae
摘要：
目的：像RS Oph这样的经常性新星系统被认为是Ia型超新星爆炸的可能通道，基于吸积白矮星的高质量。这一假设的额外支持最近已提供了由周围SN 2006 X和SN 2007 le拱星材料的检测，显示出与预期的结构兼容的经常性新星outbursts.In本文中，我们调查的RS Oph和它的结构的拱星环境，目的是建立一个更坚定的和独立的联系，这类对象和Ia型SN的祖先。研究方法：我们研究的时间演化的钙，钠I和KI的吸收功能在RS Oph，之前，期间和之后的最后一次爆发，使用多历元，高分辨率光谱，并采用相同的方法为SN 2006 X和SN 2007 le。结果：检测到一些组分，相对于RS Oph的系统速度蓝移。特别是，一个功能强烈减弱，在爆发后的头两个星期，同时消失的非常狭窄的P-Cyg配置文件叠加在更广泛的新星发射线的H，He，Fe II和其他元素。结论：我们将这些事实解释为星周物质密度增强的特征，这表明经常性的喷发确实可能在供体恒星丢失的物质中产生复杂的结构。这在RS Oph和Ia型SN 2006 X的祖细胞系统之间建立了强有力的联系，已经检测到类似的特征。
英文摘要：
Aims: Recurrent nova systems like RS Oph have been proposed as a possible channel to Type Ia Supernova explosions, based on the high mass of the accreting white dwarf. Additional support to this hypothesis has been recently provided by the detection of circumstellar material around SN2006X and SN2007le, showing a structure compatible with that expected for recurrent nova outbursts.In this paper we investigate the circumstellar environment of RS Oph and its structure, with the aim of establishing a firmer and independent link between this class of objects and Type Ia SN progenitors. Methods: We study the time evolution of CaII, NaI and KI absorption features in RS Oph, before, during, and after the last outburst, using multi-epoch, high-resolution spectroscopy, and applying the same method adopted for SN2006X and SN2007le. Results: A number of components, blue-shifted with respect to the systemic velocity of RS Oph, are detected. In particular, one feature strongly weakens in the first two weeks after the outburst, simultaneously with the disappearance of very narrow P-Cyg profiles overimposed on the much wider nova emission lines of H, He, FeII and other elements. Conclusions: We interpret these facts as the signature of density enhancements in the circumstellar material, suggesting that the recurrent eruptions might indeed create complex structures within the material lost by the donor star. This establishes a strong link between RS Oph and the progenitor system of the Type Ia SN2006X, for which similar features have been detected.
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