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arXiv 2007.13144astro-ph.HE
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PTF11rka:在剥离包层和H-贫超亮恒星核心崩溃的十字路口的相互作用超新星

PTF11rka: an interacting supernova at the crossroads of stripped-envelope and H-poor super-luminous stellar core collapses

Elena Pian, Paolo A. Mazzali, Takashi J. Moriya, Adam Rubin, Avishay Gal-Yam, Iair Arcavi, Sagi Ben-Ami, Nadia Blagorodnova, Milena Bufano, Alex V. Filippenko, … 展开作者

Elena Pian, Paolo A. Mazzali, Takashi J. Moriya, Adam Rubin, Avishay Gal-Yam, Iair Arcavi, Sagi Ben-Ami, Nadia Blagorodnova, Milena Bufano, Alex V. Filippenko, Mansi Kasliwal, Shri R. Kulkarni, Ragnhild Lunnan, Ilan Manulis, Tom Matheson, Peter E. Nugent, Eran Ofek, Dan A. Perley, Simon J. Prentice, Ofer Yaron

摘要:

Palomar Transient Factory报告的贫氢超新星PTF 11 rka(z = 0.0744),在2011年12月5日UT估计爆炸时间后的几天开始用各种望远镜观测,此后长达432个静止帧天。光变曲线的上升部分仅在R_PTF滤波器带中被监测到,并且在估计的爆炸时间之后约30个静止帧天在该带中达到最大值。PTF 11 rka的光变曲线和光谱与从主序质量为25- 40 Msun的前身演化而来的~10 Msun碳氧核的核塌缩爆炸相一致,该爆炸释放了~ 4 x 10^{51} erg的动能(KE),排出了~8 Msun的喷出物(Mej),并合成了~0.5 Msun的56 Nichel。PTF 11 rka的光球光谱的特征是窄吸收线,指出最高喷出物速度的抑制~> 15,000 km/s。如果喷出物撞击到一个致密的、混浊的星周介质,这是可以预料的。这反过来又导致它们损失了一小部分能量(约5 x 10^50 erg),其中不到2%的能量转化为维持最大亮度之前的光变曲线的辐射。这让人想起了超发光的SN 2007 bi,其光变曲线形状和光谱与PTF 11 rka非常相似,尽管后者的亮度低10倍,而且演化速度更快。PTF 11 rka实际上在光度上更类似于伽马射线暴超新星(GRB-SNe),尽管它具有较低的能量和较低的KE/Mej比率。

英文摘要:

The hydrogen-poor supernova PTF11rka (z = 0.0744), reported by the Palomar Transient Factory, was observed with various telescopes starting a few days after the estimated explosion time of 2011 Dec. 5 UT and up to 432 rest-frame days thereafter. The rising part of the light curve was monitored only in the R_PTF filter band, and maximum in this band was reached ~30 rest-frame days after the estimated explosion time. The light curve and spectra of PTF11rka are consistent with the core-collapse explosion of a ~10 Msun carbon-oxygen core evolved from a progenitor of main-sequence mass 25--40 Msun, that liberated a kinetic energy (KE) ~ 4 x 10^{51} erg, expelled ~8 Msun of ejecta (Mej), and synthesised ~0.5 Msun of 56Nichel. The photospheric spectra of PTF11rka are characterised by narrow absorption lines that point to suppression of the highest ejecta velocities ~>15,000 km/s. This would be expected if the ejecta impacted a dense, clumpy circumstellar medium. This in turn caused them to lose a fraction of their energy (~5 x 10^50 erg), less than 2% of which was converted into radiation that sustained the light curve before maximum brightness. This is reminiscent of the superluminous SN 2007bi, the light-curve shape and spectra of which are very similar to those of PTF11rka, although the latter is a factor of 10 less luminous and evolves faster in time. PTF11rka is in fact more similar to gamma-ray burst supernovae (GRB-SNe) in luminosity, although it has a lower energy and a lower KE/Mej ratio.

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