arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1612.07321astro-ph.HEastro-ph.SR
收藏

最大贫氢超亮超新星光谱数据集的分析

Analyzing the Largest Spectroscopic Dataset of Hydrogen-Poor Super-Luminous Supernovae

Yu-Qian Liu, Maryam Modjaz, Federica B. Bianco

摘要:

超亮超新星(英语:Super-luminous supernovae,SLSNe)是一种非常明亮的爆炸,其能量来源和前身是高度争议的。宽线超新星Ic(SNe Ic-bl)是唯一与长持续时间伽马射线暴(GRB)有关的超新星。研究贫氢SLSNe(SLSNe Ic)和贫氢剥离包络核心塌陷SNe(特别是SNe Ic和SNe Ic-bl)的总体之间的光谱相似性和差异,可以提供关键的观察结果,以测试基于各种电源模型和祖模型的理论预测。在本文中,我们收集了所有已发表的光谱的32 SLSNe Ic,21 SNe Ic-bl,以及17 SNe Ic,量化他们的光谱特征,构建平均光谱,并比较它们在一个系统的方式使用新的工具,我们已经开发。我们发现,SLSNe Ic和SNe Ic-bl,包括那些与伽玛暴,具有可比的宽度,其光谱特征和平均吸收速度在所有阶段。因此,我们的研究结果加强了SLSNe Ic和GRB之间的联系。特别地,SLSNe Ic在峰值后10天具有$-15,000 +/- 2,600$ \kms ~的平均\FeII吸收速度,其平均比SNe Ic高$\sim7,000$ \kms ~。SLSNe Ic也具有比SNe Ic显著更宽的\FeII线。此外,我们发现SLSNe Ic如此高的吸收速度和宽度速度可能很难用相互作用模型来解释,并且在13个SLSNe Ic中,没有一个观测到的吸收速度跨度超过10天,具有令人信服的平坦速度演化,这与磁星模型在一维上的解释不一致。最后,我们比较了SN 2011 kl,第一个与超长GRB相连的SN,与SLSNe Ic和SNe Ic-bl的平均谱。

英文摘要:

Super-luminous supernovae (SLSNe) are tremendously luminous explosions whose power sources and progenitors are highly debated. Broad-lined SNe Ic (SNe Ic-bl) are the only type of SNe that are connected with long-duration gamma ray bursts (GRBs). Studying the spectral similarity and difference between the populations of hydrogen-poor SLSNe (SLSNe Ic) and of hydrogen-poor stripped-envelope core-collapse SNe, in particular SNe Ic and SNe Ic-bl, can provide crucial observations to test predictions of theories based on various power source models and progenitor models. In this paper, we collected all of the published optical spectra of 32 SLSNe Ic, 21 SNe Ic-bl, as well as 17 SNe Ic, quantified their spectral features, constructed average spectra, and compared them in a systematic way using new tools we have developed. We find that SLSNe Ic and SNe Ic-bl, including those connected with GRBs, have comparable widths for their spectral features and average absorption velocities at all phases. Thus, our findings strengthen the connection between SLSNe Ic and GRBs. In particular, SLSNe Ic have average \FeII absorption velocities of $-15,000 +/- 2,600$ \kms~at 10 days after peak, which are higher than those of SNe Ic by $\sim7,000$ \kms~on average. SLSNe Ic also have significantly broader \FeII lines than SNe Ic. Moreover, we find that such high absorption and width velocities of SLSNe Ic may be hard to explain by the interaction model, and none of 13 SLSNe Ic with measured absorption velocities spanning over 10 days has a convincing flat velocity-evolution, which is inconsistent with the magnetar model in one dimension. Lastly, we compare SN 2011kl, the first SN connected with an ultra-long GRB, with the mean spectrum of SLSNe Ic and of SNe Ic-bl.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑