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- Title
On the triple peaks of SNHunt248 in NGC 5806.
- Authors
Kankare, E.; Kotak, R.; Pastorello, A.; Fraser, M.; Mattila, S.; Smartt, S. J.; Bruce, A.; Chambers, K. C.; Elias-Rosa, N.; Flewelling, H.; Fremling, C.; Harmanen, J.; Huber, M.; Jerkstrand, A.; Kangas, T.; Kuncarayakti, H.; Magee, M.; Magnier, E.; Polshaw, J.; Smith, K. W.
- 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/Lʘ) ~ 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.
- Subjects
SUPERNOVAE; EXTRAGALACTIC distances; INFRARED spectroscopy; CIRCUMSTELLAR matter; SUPERGIANT stars; STELLAR luminosity function; STELLAR magnitudes
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2015, Vol 581, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201526631