تقرير
A UV Resonance Line Echo from a Shell Around a Hydrogen-Poor Superluminous Supernova
| العنوان: | A UV Resonance Line Echo from a Shell Around a Hydrogen-Poor Superluminous Supernova |
|---|---|
| المؤلفون: | Lunnan, R., Fransson, C., Vreeswijk, P. M., Woosley, S. E., Leloudas, G., Perley, D. A., Quimby, R. M., Yan, Lin, Blagorodnova, N., Bue, B. D., Cenko, S. B., De Cia, A., Cook, D. O., Fremling, C. U., Gatkine, P., Gal-Yam, A., Kasliwal, M. M., Kulkarni, S. R., Masci, F. J., Nugent, P. E., Nyholm, A., Rubin, A., Suzuki, N., Wozniak, P. |
| سنة النشر: | 2018 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena |
| الوصف: | Hydrogen-poor superluminous supernovae (SLSN-I) are a class of rare and energetic explosions discovered in untargeted transient surveys in the past decade. The progenitor stars and the physical mechanism behind their large radiated energies ($\sim10^{51}$ erg) are both debated, with one class of models primarily requiring a large rotational energy, while the other requires very massive progenitors to either convert kinetic energy into radiation via interaction with circumstellar material (CSM), or engender a pair-instability explosion. Observing the structure of the CSM around SLSN-I offers a powerful test of some scenarios, though direct observations are scarce. Here, we present a series of spectroscopic observations of the SLSN-I iPTF16eh, which reveal both absorption and time- and frequency-variable emission in the Mg II resonance doublet. We show that these observations are naturally explained as a resonance scattering light echo from a circumstellar shell. Modeling the evolution of the emission, we find a shell radius of 0.1 pc and velocity of 3300 km s$^{-1}$, implying the shell was ejected three decades prior to the supernova explosion. These properties match theoretical predictions of pulsational pair-instability shell ejections, and imply the progenitor had a He core mass of $\sim 50-55~{\rm M}_{\odot}$, corresponding to an initial mass of $\sim 115~{\rm M}_{\odot}$. Comment: Accepted. Fixed typo in table header, otherwise unchanged from previous version |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/1808.04887 |
| رقم الأكسشن: | edsarx.1808.04887 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |