%0 Journal Article
%T On the triple peaks of SNHunt248 in NGC 5806
%A E. Kankare
%A R. Kotak
%A A. Pastorello
%A M. Fraser
%A S. Mattila
%A S. J. Smartt
%A A. Bruce
%A K. C. Chambers
%A N. Elias-Rosa
%A H. Flewelling
%A C. Fremling
%A J. Harmanen
%A M. Huber
%A A. Jerkstrand
%A T. Kangas
%A H. Kuncarayakti
%A M. Magee
%A E. Magnier
%A J. Polshaw
%A K. W. Smith
%A J. Sollerman
%A L. Tomasella
%J Physics
%D 2015
%I arXiv
%R 10.1051/0004-6361/201526631
%X We present our findings on a supernova (SN) impostor, SNHunt248, based on optical and near-IR data spanning $\sim$15 yrs before discovery, to $\sim$1 yr post-discovery. The light curve displays three distinct peaks, the brightest of which is at $M_{R} \sim -15.0$ 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 $\mu$m spectral energy distribution at -740 d is well-matched by a single 6700 K blackbody with $\log(L/L_\odot) \sim 6.1$. 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 $\sim \pm1$ mag. At current epochs ($\sim$1 yr post-outburst), the absolute magnitude ($M_{R} \sim -9$ mag) is just below the faintest observed historical absolute magnitude $\sim$10 yrs before discovery.
%U http://arxiv.org/abs/1508.04730v1