The Supernova Impostor PSN J09132750+7627410 and Its Progenitor

Abstract

We report the results of our follow-up campaign of the supernova impostor PSN J09132750+7627410, based on optical data covering ∼ 250 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 ∼ 3 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 ± 0.19 mag at maximum, a typical luminosity for supernova impostors. Amateur astronomers provided ∼ 4 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 M ⊙ white-yellow supergiant. Subject headings: supernovae: general -supernovae: individual (PSN J09132750+7627410, SN 2007sv, SN 1997bs, SNHunt248), galaxies: individual (NGC 2748) 10 http://swift.gsfc.nasa.gov/ 11

The long-lived Type IIn SN 2015da: Infrared echoes and strong interaction within an extended massive shell

“…Maund et al 2006), although with fainter absolute magnitudes (M peak −14 mag, e.g. Tartaglia et al 2015Tartaglia et al , 2016. In addition, we cannot rule out a larger value of reddening in the environment of the progenitor star before explosion.…”

Supernovae and transients with circumstellar interaction

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The Type IIn Supernova SN 2010bt: The Explosion of a Star in Outburst

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