arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1108.2869astro-ph.HEastro-ph.COastro-ph.SR
收藏

IIn型超新星2010 jl谱线轮廓的系统蓝移:激波后尘埃形成的证据?

Systematic Blueshift of Line Profiles in the Type IIn Supernova 2010jl: Evidence for Post-Shock Dust Formation?

Nathan Smith, Jeffrey M. Silverman, Alexei V. Filippenko, Michael C. Cooper, Thomas Matheson, Fuyan Bian, Benjamin J. Weiner, Julia M. Comerford

摘要:

I型超新星的爆炸波与母星周围致密的星周物质(CSM)之间存在强相互作用。SN 2010 jl是2010年最亮的核塌缩SN,是一个具有强CSM相互作用的IIn型爆发。Andrews等人最近报告了SN 2010 jl中红外过量的证据,表明新的尘埃形成或红外回波中CSM尘埃的加热。在这里,我们报告了SN 2010 jl的多时期光谱,揭示了新尘埃形成的迹象:随着线的红色一侧被越来越多的消光阻挡,发射线轮廓变得系统性地更加蓝移。这种效应在H $α$的中宽(400- 4000 km/s)分量中可以清楚地看到,大约从爆炸后30 d开始。此外,我们提出的近红外光谱表明,在氢线配置文件的不对称性是波长依赖的,出现在较短的波长更明显。这一证据表明,新的尘埃颗粒已迅速形成的后冲击壳SN 2010 jl产生的CSM相互作用。由于观测到的尘埃温度被归因于红外回波而不是新的尘埃,因此(1)$λ< 5 μ$ m处的红外过量发射不是SNe中新尘埃形成的特别敏感的示踪剂,或者(2)关于预期尘埃温度的一些假设可能需要进一步研究。最后,我们讨论了一种可能的机制以外的灰尘,可能会导致越来越蓝移线轮廓SNeIIn,虽然波长依赖性的不对称性反对这种假设的情况下,SN 2010 jl。

英文摘要:

Type IIn SNe show spectral evidence for strong interaction between their blast wave and dense circumstellar material (CSM) around the progenitor star. SN2010jl was the brightest core-collapse SN in 2010, and it was a Type IIn explosion with strong CSM interaction. Andrews et al. recently reported evidence for an IR excess in SN2010jl, indicating either new dust formation or the heating of CSM dust in an IR echo. Here we report multi-epoch spectra of SN2010jl that reveal the tell-tale signature of new dust formation: emission-line profiles becoming systematically more blueshifted as the red side of the line is blocked by increasing extinction. The effect is seen clearly in the intermediate-width (400--4000 km/s) component of H$α$ beginning roughly 30d after explosion. Moreover, we present near-IR spectra demonstrating that the asymmetry in the hydrogen-line profiles is wavelength dependent, appearing more pronounced at shorter wavelengths. This evidence suggests that new dust grains had formed quickly in the post-shock shell of SN 2010jl arising from CSM interaction. Since the observed dust temperature has been attributed to an IR echo and not to new dust, either (1) IR excess emission at $λ< 5 μ$m is not a particularly sensitive tracer of new dust formation in SNe, or (2) some assumptions about expected dust temperatures might require further study. Lastly, we discuss one possible mechanism other than dust that might lead to increasingly blueshifted line profiles in SNeIIn, although the wavelength dependence of the asymmetry argues against this hypothesis in the case of SN2010jl.

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。

↑