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The supernova impostor PSN J09132750+7627410 and its progenitor

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arxiv 1604.04628 v1 pith:TDE3TO3J submitted 2016-04-15 astro-ph.SR astro-ph.GAastro-ph.HE

L. Tartaglia , N. Elias-Rosa , A. Pastorello , S. Benetti , S. Taubenberger , E. Cappellaro , G. Cortini , V. Granata
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E. E. O. Ishida A. Morales-Garoffolo U. M. Noebauer P. Ochner L. Tomasella S. Zaggia
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classification astro-ph.SRastro-ph.GAastro-ph.HE
keywords supernovaarchivalimpostorj09132750linesprogenitorprominenttransient
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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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