On the triple peaks of SNHunt248 in NGC 5806

E. Kankare, R. Kotak, A. Pastorello, M. Fraser, S. Mattila, S. J. Smartt, A. Bruce, K. C. Chambers, N. Elias-Rosa, H. Flewelling, C. Fremling, J. Harmanen, M. Huber, A. Jerkstrand, T. Kangas, H. Kuncarayakti, M. Magee, E. Magnier, J. Polshaw, K. W. SmithJ. Sollerman, L. Tomasella

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30 Citations (Scopus)
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Abstract

We present our findings on a supernova (SN) impostor, SNHunt248, based on optical and near-IR data spanning ~15 yr before discovery, to ~1 yr post-discovery. The light curve displays three distinct peaks, the brightest of which is at MR ~ −15.0 mag. The post-discovery evolution is consistent with the ejecta from the outburst interacting with two distinct regions of circumstellar material. The 0.5–2.2 μm spectral energy distribution at −740 d is well-matched by a single 6700 K blackbody with log (L/L⊙) ~ 6.1. This temperature and luminosity support previous suggestions of a yellow hypergiant progenitor; however, we find it to be brighter than the brightest and most massive Galactic late-F to early-G spectral type hypergiants. Overall the historical light curve displays variability of up to ~ ± 1 mag. At current epochs (~1 yr post-outburst), the absolute magnitude (MR ~ − 9 mag) is just below the faintest observed historical absolute magnitude ~10 yr before discovery.
Original languageEnglish
Article numberL4
Number of pages7
JournalAstronomy and Astrophysics
Volume581
DOIs
Publication statusPublished - 01 Sep 2015

Keywords

  • Stars: mass-loss
  • Stars: massive
  • Supernovae: general
  • Supernovae: individual: SNHunt248

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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