The supernova impostor PSN J09132750+7627410 and its progenitor

Autor:	Tartaglia, L., Elias-Rosa, N., Pastorello, A., Benetti, S., Taubenberger, S., Cappellaro, E., Cortini, G., Granata, V., Ishida, E. E. O., Morales-Garoffolo, A., Noebauer, U. M., Ochner, P., Tomasella, L., Zaggia, S.
Rok vydání:	2016
Předmět:	Astrophysics - Solar and Stellar Astrophysics Astrophysics - Astrophysics of Galaxies Astrophysics - High Energy Astrophysical Phenomena
Druh dokumentu:	Working Paper
DOI:	10.3847/2041-8205/823/2/L23
Popis:	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. Comment: 7 pages, 4 figures, supplemental material available in the source file. Accepted for publication on Astrophysical Journal Letters
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1604.04628 Zobrazit plný text záznamu View this record from Arxiv