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. Smith; J. Sollerman; L. Tomasella

doi:10.1051/0004-6361/201526631

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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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 language	English
Article number	L4
Number of pages	7
Journal	Astronomy and Astrophysics
Volume	581
DOIs	https://doi.org/10.1051/0004-6361/201526631
Publication status	Published - 01 Sept 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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10.1051/0004-6361/201526631

On the triple peaks of SNHunt248 in NGC 5806
Copyright ESO 2015. Article published by EDP Sciences.
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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., ... Tomasella, L. (2015). On the triple peaks of SNHunt248 in NGC 5806. Astronomy and Astrophysics, 581, Article L4. https://doi.org/10.1051/0004-6361/201526631

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title = "On the triple peaks of SNHunt248 in NGC 5806",

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.",

keywords = "Stars: mass-loss, Stars: massive, Supernovae: general, Supernovae: individual: SNHunt248",

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

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doi = "10.1051/0004-6361/201526631",

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Kankare, E, Kotak, R, Pastorello, A, Fraser, M, Mattila, S, Smartt, SJ, Bruce, A, Chambers, KC, Elias-Rosa, N, Flewelling, H, Fremling, C, Harmanen, J, Huber, M, Jerkstrand, A, Kangas, T, Kuncarayakti, H, Magee, M, Magnier, E, Polshaw, J, Smith, KW, Sollerman, J & Tomasella, L 2015, 'On the triple peaks of SNHunt248 in NGC 5806', Astronomy and Astrophysics, vol. 581, L4. https://doi.org/10.1051/0004-6361/201526631

TY - JOUR

T1 - On the triple peaks of SNHunt248 in NGC 5806

AU - Kankare, E.

AU - Kotak, R.

AU - Pastorello, A.

AU - Fraser, M.

AU - Mattila, S.

AU - Smartt, S. J.

AU - Bruce, A.

AU - Chambers, K. C.

AU - Elias-Rosa, N.

AU - Flewelling, H.

AU - Fremling, C.

AU - Harmanen, J.

AU - Huber, M.

AU - Jerkstrand, A.

AU - Kangas, T.

AU - Kuncarayakti, H.

AU - Magee, M.

AU - Magnier, E.

AU - Polshaw, J.

AU - Smith, K. W.

AU - Sollerman, J.

AU - Tomasella, L.

PY - 2015/9/1

Y1 - 2015/9/1

N2 - 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.

AB - 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.

KW - Stars: mass-loss

KW - Stars: massive

KW - Supernovae: general

KW - Supernovae: individual: SNHunt248

UR - http://www.scopus.com/inward/record.url?scp=84941195495&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201526631

DO - 10.1051/0004-6361/201526631

M3 - Article

AN - SCOPUS:84941195495

SN - 0004-6361

VL - 581

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - L4

ER -

On the triple peaks of SNHunt248 in NGC 5806

Abstract

Keywords

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