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arXiv · 1604.04628

The supernova impostor PSN J09132750+7627410 and its progenitor

L. Tartaglia·N. Elias-Rosa·A. Pastorello·S. Benetti·S. Taubenberger·E. Cappellaro·G. Cortini·V. Granata·E. E. O. Ishida·A. Morales-Garoffolo·U. M. Noebauer·P. Ochner·L. Tomasella·S. Zaggia
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Abstract

We report the results of our follow-up campaign of the supernova impostor PSN J09132750+7627410, based on optical data covering $\sim250\,\rm{d}$. From the beginning, the transient shows prominent narrow Balmer lines with P-Cygni profiles, with a blue-shifted absorption component becoming more prominent with time. Along the $\sim3\,\rm{months}$ of the spectroscopic monitoring, broad components are never detected in the hydrogen lines, suggesting that these features are produced in slowly expanding material. The transient reaches an absolute magnitude $M_r=-13.60\pm0.19\,\rm{mag}$ at maximum, a typical luminosity for supernova impostors. Amateur astronomers provided $\sim4\,\rm{years}$ of archival observations of the host galaxy, NGC 2748. The detection of the quiescent progenitor star in archival images obtained with the Hubble Space Telescope suggests it to be an $18-20$\msun white-yellow supergiant.

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L. Tartaglia, N. Elias-Rosa, A. Pastorello, S. Benetti, S. Taubenberger, E. Cappellaro, G. Cortini, V. Granata, E. E. O. Ishida, A. Morales-Garoffolo, U. M. Noebauer, P. Ochner, L. Tomasella, S. Zaggia. 2016-04-15. The supernova impostor PSN J09132750+7627410 and its progenitor. https://doi.org/10.3847/2041-8205%2F823%2F2%2Fl23

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