期刊
ASTRONOMY & ASTROPHYSICS
卷 581, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201526631
关键词
stars: massive; stars: mass-loss; supernovae: general; supernovae: individual: SNHunt248
资金
- European Research Council under the European Union's Seventh Framework Programme/ERC [291222]
- STFC [ST/L000709/1]
- European Union FP7 programme through ERC [320360]
- PRIN-INAF [267251]
- Ministry of Economy, Development, and Tourism's Millennium Science Initiative [IC120009]
- CONICYT through FONDECYT [3140563]
- National Aeronautics and Space Administration [NNX08AR22G, AST-1238877, NNX14AM74G, NNX12AR65G]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1238877] Funding Source: National Science Foundation
- STFC [ST/L000709/1, ST/M000095/1, ST/M001970/1, ST/M003035/1, ST/M003515/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/M003515/1, ST/M000095/1, ST/L000709/1, ST/M001970/1, ST/M003035/1] Funding Source: researchfish
We present our findings on a supernova (SN) impostor, SNHunt248, based on optical and near-IR data spanning similar to 15 yr before discovery, to similar to 1 yr post-discovery. The light curve displays three distinct peaks, the brightest of which is at MR similar to -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-circle dot) similar to 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 similar to +/- 1 mag. At current epochs (similar to 1 yr post-outburst), the absolute magnitude (MR similar to -9 mag) is just below the faintest observed historical absolute magnitude similar to 10 yr before discovery.
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