2015A&A...581L...4K


Query : 2015A&A...581L...4K

2015A&A...581L...4K - Astronomy and Astrophysics, volume 581, L4-4 (2015/9-1)

On the triple peaks of SN Hunt 248 in NGC 5806.

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., SOLLERMAN J. and TOMASELLA L.

Abstract (from CDS):

We present our findings on a supernova (SN) impostor, SNHunt248, based on optical and near-IR data spanning ∼15yr before discovery, to ∼1yr post-discovery. The light curve displays three distinct peaks, the brightest of which is at MR ~-15.0mag. The post-discovery evolution is consistent with the ejecta from the outburst interacting with two distinct regions of circumstellar material. The 0.5-2.2µm spectral energy distribution at -740d is well-matched by a single 6700K 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 ~±1mag. At current epochs (∼1yr post-outburst), the absolute magnitude (MR~-9mag) is just below the faintest observed historical absolute magnitude ∼10yr before discovery.

Abstract Copyright:

Journal keyword(s): stars: massive - stars: mass-loss - supernovae: general - supernovae: individual: SN Hunt 248

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 SN 2009kn SN* 08 09 43.04 -17 44 51.3           SNIIn 43 1
2 PSN J14595947+0154262 SN? 14 59 59.47 +01 54 26.6           ~ 31 1
3 NGC 5806 AGN 15 00 00.4088018736 +01 53 28.779594792   12.40 11.70 10.94 11.6 ~ 266 1
4 WRAY 15-1676 pA* 17 19 49.3290860880 -39 10 37.928806356     13.1     ~ 44 1
5 SN 2009ip s*b 22 23 08.26 -28 56 52.4           LBV 310 0

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2022.08.10-19:47:22

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