标题： 关于富氢超亮超新星的性质 显示英文标题

标题： On the nature of Hydrogen-rich Superluminous Supernovae

摘要： 我们介绍了两个富含氢的超亮超新星（SLSNe），即SN2013hx和PS15br。这些天体与SN2008es一起是唯一在光球相期间显示出明显、宽阔的Halpha特征的SLSNe，并且在早期光谱中没有任何快速运动抛射物与周围星周壳层之间强相互作用的迹象。尽管PS15br的峰值光度比其他两个天体暗淡，但其测光演化与SN2013hx相似，与其他处于相似光度空间的超新星不同。我们将它们都归类为SLSNe II，因此不同于已知的SLSN IIn类别。这两个瞬变体在最大亮度后200天显示出强烈、多组分的Halpha发射，我们将其解释为抛射物与不对称、团块状星周物质相互作用的指示。这两个天体的光谱和测光演化与II型超新星相似，尽管它们的光度要高得多，并且演化时间尺度更慢。这在定性上类似于SLSNe I与正常Ic型超新星之间的比较，前者更明亮且演化更缓慢。我们将磁星和相互作用半解析代码应用于拟合我们两个天体和SN2008es的光变曲线。总体观测数据倾向于支持磁星或中心引擎模型作为峰值光度的来源，尽管晚期相互作用的明显特征表明相互作用可能在SLSNe II的光度演化中某些阶段起作用。 显示英文摘要

摘要： We present two hydrogen-rich superluminous supernovae (SLSNe), namely SN2013hx and PS15br. These objects, together with SN2008es are the only SLSNe showing a distinct, broad Halpha feature during the photospheric phase and also do not show any sign of strong interaction between fast-moving ejecta and circumstellar shells in their early spectra. Despite PS15br peak luminosity is fainter than the other two objects, the spectrophotometric evolution is similar to SN2013hx and different than any other supernova in a similar luminosity space. We group all of them as SLSNe II and hence distinct from the known class of SLSN IIn. Both transients show a strong, multi-component Halpha emission after 200 days past maximum which we interpret as an indication of interaction of the ejecta with an asymmetric, clumpy circumstellar material. The spectra and photometric evolution of the two objects are similar to type II supernovae, although they have much higher luminosity and evolve on slower timescales. This is qualitatively similar to how SLSNe I compare with normal type Ic in that the former are brighter and evolve more slowly. We apply a magnetar and an interaction semi-analytical codes to fit the light curves of our two objects and SN2008es. The overall observational dataset would tend to favour the magnetar, or central engine, model as the source of the peak luminosity although the clear signature of late-time interaction indicates that interaction can play a role in the luminosity evolution of SLSNe II at some phases.