2015MNRAS.447.1922M


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET18:03:41

2015MNRAS.447.1922M - Mon. Not. R. Astron. Soc., 447, 1922-1934 (2015/February-3)

SN Hunt 248: a super-Eddington outburst from a massive cool hypergiant.

MAUERHAN J.C., VAN DYK S.D., GRAHAM M.L., ZHENG W., CLUBB K.I., FILIPPENKO A.V., VALENTI S., BROWN P., SMITH N., HOWELL D.A. and ARCAVI I.

Abstract (from CDS):

We present observations of SN Hunt 248, a new supernova (SN) impostor in NGC 5806, which began a multistage outburst in 2014 May. The `2014a' discovery brightening exhibited an absolute magnitude of M ~ -12 and the spectral characteristics of a cool, dense outflow, including P Cygni lines of Feii, Hi, and Nai, and line blanketing from metals. The source rapidly climbed and peaked at M ~ -15mag after two additional weeks. During this bright `2014b' phase the spectrum became dominated by Balmer emission and a stronger blue continuum, similar to the SN impostor SN 1997bs. Archival images from the Hubble Space Telescope between 1997 and 2005 reveal a luminous (4x105L) variable precursor star. Its location on the Hertzsprung-Russell diagram is consistent with a massive (Minit ~ 30M) cool hypergiant having an extremely dense wind and an Eddington ratio (Γ) just below unity. At the onset of the 2014a brightening, however, the object was super-Eddington (Γ = 4-12). The subsequent boost in luminosity during the 2014b phase probably resulted from circumstellar interaction. SN Hunt 248 provides the first case of a cool hypergiant undergoing a giant eruption reminiscent of outbursts from luminous blue variable stars (LBVs). This lends support to the hypothesis that some cool hypergiants, such as ρ Cas, could be LBVs masquerading under a pseudo-photosphere created by their extremely dense winds. Moreover, SN Hunt 248 demonstrates that eruptions stemming from such stars can rival in peak luminosity the giant outbursts of much more massive systems like η Car.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): circumstellar matter - stars: evolution - supernovae: general - supernovae: individual: SN Hunt 248 - stars: winds, outflows

Simbad objects: 34

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Number of rows : 34

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME NGC 300 OT2008-1 ev 00 54 34.16 -37 38 28.6           ~ 110 1
2 HD 5980 WR* 00 59 26.5847969465 -72 09 53.927725716   11.13 11.31   11.029 WN4+O7I: 363 1
3 [HS53] A s*y 01 32 32.8024103986 +30 30 25.014155970 20.1 19.9 19.1 18.6 17.7 F8Ia 51 0
4 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5253 1
5 SN 1961V SN* 02 43 36.42 +37 20 43.6   12.7 12.5     SNIIpec? 199 2
6 NAME UGC 2773 OT2009-1 SN? 03 32 07.24 +47 47 39.6           ~ 45 1
7 V* S Dor sg* 05 18 14.3572490675 -69 15 01.148131817 9.08 10.39 10.25 9.74 9.14 A5Iaeq 352 0
8 HD 269858 s*b 05 36 43.6942807271 -69 29 47.449383685   10.24 10.15 9.95 9.05 LBV 268 2
9 CPD-69 463 s*y 05 38 51.6167474749 -69 08 07.314653596 11.93 12.45 12.014     F7Ia 81 1
10 SN 1954J SN* 07 36 56.20 +65 37 52.3   16.3 16.50     SNIIpec? 90 2
11 SN 2006jc SN* 09 17 20.78 +41 54 32.7     13.8     SNIbn 279 1
12 PSN J10081059+5150570 s*b 10 08 10.58 +51 50 57.1           LBV 86 0
13 SN 1999bw SN* 10 19 46.81 +45 31 35.0     17.8     SNIIn? 57 2
14 HD 90177 s*b 10 22 53.8426931454 -59 37 28.361118869 9.16 9.66 8 8.15   LBV 308 0
15 Feige 34 HS* 10 39 36.7377085527 +43 06 09.209752646 9.613 10.91 11.14 11.319 11.464 sdOp 615 0
16 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2255 0
17 SN 2000ch SN* 10 52 41.40 +36 40 09.5     17.4     SNIIn? 85 2
18 V* AG Car WR* 10 56 11.5779283438 -60 27 12.809532379 7.00 7.57 6.96 7.73   WN11h 598 0
19 SN 1997bs ev 11 20 14.25 +12 58 19.6     17.13     SNIIn? 112 1
20 SN 1994W SN* 12 02 10.92 +62 08 32.7     13.3     SNIInP 173 1
21 SN 2010U s?b 12 15 41.06 +36 20 02.9           LBV? 14 0
22 SN 2002bu SN* 12 17 37.18 +45 38 47.4     15.5     SNIIn? 48 2
23 NAME M85 OT2006-1 No* 12 25 23.82 +18 10 56.2     19.30     ~ 58 1
24 BD+26 2606 SB* 14 49 02.3550036151 +25 42 09.136461939 9.92 10.16 9.73 9.27 8.95 A5 355 0
25 PSN J14595947+0154262 SN? 14 59 59.47 +01 54 26.6           ~ 27 1
26 iPTF 13bvn SN* 15 00 00.152 +01 52 53.17           SNIb 115 0
27 NGC 5806 AGN 15 00 00.432 +01 53 28.56   12.40 11.70 10.94 11.6 ~ 244 1
28 HD 168625 s*b 18 21 19.5486475779 -16 22 26.077308888 10.15 9.78 8.37 8.76   B6Iap 255 2
29 IRC +10420 pA* 19 26 48.0981288433 +11 21 16.756524951   13.98 11.66     F8Ia+e 456 0
30 * P Cyg s*b 20 17 47.2020844 +38 01 58.552724 4.66 5.24 4.82 4.28 4.02 B1-2Ia-0ep 1140 1
31 SN 2008S ev 20 34 45.33 +60 05 58.4   19.89 18.79 17.93   SNIIn? 215 1
32 SN 2009ip s*b 22 23 08.26 -28 56 52.4           LBV 284 0
33 V* V509 Cas LP* 23 00 05.1007915562 +56 56 43.348681058 8.01 6.68 5.13 3.96 3.11 G4_0 316 0
34 * rho Cas LP* 23 54 23.0339951270 +57 29 57.766930774 7.00 5.85 4.59 3.63 2.89 G2_0 365 0

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2021.03.05-18:03:41

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