arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1910.04592astro-ph.HE
收藏

II型超新星的低膨胀速度

Luminous Type II supernovae for their low expansion velocities

Ó. Rodríguez, G. Pignata, J. P. Anderson, T. J. Moriya, A. Clocchiatti, F. Förster, J. L. Prieto, M. M. Phillips, C. R. Burns, C. Contreras, G. Folatelli, C. P.… 展开作者

Ó. Rodríguez, G. Pignata, J. P. Anderson, T. J. Moriya, A. Clocchiatti, F. Förster, J. L. Prieto, M. M. Phillips, C. R. Burns, C. Contreras, G. Folatelli, C. P. Gutiérrez, M. Hamuy, N. I. Morrell, M. D. Stritzinger, N. B. Suntzeff, S. Benetti, E. Cappellaro, N. Elias-Rosa, A. Pastorello, M. Turatto, J. Maza, R. Antezana, R. Cartier, L. González, J. B. Haislip, V. Kouprianov, P. López, S. Marchi-Lasch, D. Reichart

摘要:

我们目前的光学和近红外数据的三个II型超新星(SNe II),SN 2008 bm,SN 2009 aj和SN 2009 au。这些SNe显示了以下共同的特征:早期的喷射物与星周物质(CSM)相互作用的迹象,蓝色的$B\!-\!V$,金属线的弱点,低膨胀速度,以及$V$带绝对星等比基于其膨胀速度的正常SNe II预期的亮2-3等。文献中报道的另外两种SNe(SN 1983 K和LSQ 13 fn)具有与我们的样品相似的性质。分析这一组的五个SNe II,这是发光的低膨胀速度(LLEV),我们发现,它们的属性可以重现假设喷出物CSM相互作用,持续4-11周后爆炸。这种相互作用对辐射场的贡献似乎是决定光谱中观察到的金属线的弱点的主导成分,而不是祖金属丰度。基于流体动力学模拟,我们发现喷出物与~3.6 M $_\odot$的CSM的相互作用可以再现SN 2009 aj的光变曲线和膨胀速度。利用智利自动超新星搜索收集的数据,我们估计LLEV SNe II分数的上限为所有正常SNe II的2- 4%。根据目前的数据集,尚不清楚LLEV事件是否是具有不同祖细胞系统的SNe II的单独类别,或者它们是否是CSM与正常SN II群体的其余部分相互作用介导的连续体的极端。

英文摘要:

We present optical and near-IR data of three Type II supernovae (SNe II), SN 2008bm, SN 2009aj, and SN 2009au. These SNe display the following common characteristics: signs of early interaction of the ejecta with circumstellar material (CSM), blue $B\!-\!V$ colours, weakness of metal lines, low expansion velocities, and $V$-band absolute magnitudes 2-3 mag brighter than those expected for normal SNe II based on their expansion velocities. Two more SNe reported in the literature (SN 1983K and LSQ13fn) share properties similar to our sample. Analysing this set of five SNe II, which are luminous for their low expansion velocities (LLEV), we find that their properties can be reproduced assuming ejecta-CSM interaction that lasts between 4-11 weeks post explosion. The contribution of this interaction to the radiation field seems to be the dominant component determining the observed weakness of metal lines in the spectra rather than the progenitor metallicity. Based on hydrodynamic simulations, we find that the interaction of the ejecta with a CSM of ~3.6 M$_\odot$ can reproduce the light curves and expansion velocities of SN 2009aj. Using data collected by the Chilean Automatic Supernova Search, we estimate an upper limit for the LLEV SNe II fraction to be 2-4 per cent of all normal SNe II. With the current data-set, it is not clear whether the LLEV events are a separated class of SNe II with a different progenitor system, or whether they are the extreme of a continuum mediated by CSM interaction with the rest of the normal SN II population.

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。

↑