2018A&A...617A.115B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST01:45:21

2018A&A...617A.115B - Astronomy and Astrophysics, volume 617A, 115-115 (2018/9-1)

Catching a star before explosion: the luminous blue variable progenitor of SN 2015bh.

BOIAN I. and GROH J.H.

Abstract (from CDS):

In this paper we analyse the pre-explosion spectrum of SN2015bh by performing radiative transfer simulations using the CMFGEN code. This object has attracted significant attention due to its remarkable similarity to SN2009ip in both its pre- and post-explosion behaviour. They seem to belong to a class of events for which the fate as a genuine core-collapse supernova or a non-terminal explosion is still under debate. Our CMFGEN models suggest that the progenitor of SN2015bh had an effective temperature between 8700 and 10000K, had a luminosity in the range ~=1.8-4.74x106L, contained at least 25% H in mass at the surface, and had half-solar Fe abundances. The results also show that the progenitor of SN2015bh generated an extended wind with a mass-loss rate of ~=6x10–4 to 1.5x10–3M/yr and a velocity of 1000km/s. We determined that the wind extended to at least 2.57x1014cm and lasted for at least 30 days prior to the observations, releasing 5x10–5M into the circumstellar medium. In analogy to 2009ip, we propose that this is the material that the explosive ejecta could interact at late epochs, perhaps producing observable signatures that can be probed with future observations. We conclude that the progenitor of SN2015bh was most likely a warm luminous blue variable of at least 35M before the explosion. Considering the high wind velocity, we cannot exclude the possibility that the progenitor was a Wolf-Rayet (WR) star that inflated just before the 2013 eruption, similar to HD5980 during its 1994 episode. If the star survived, late-time spectroscopy may reveal either a similar luminous blue variable (LBV) or a WR star, depending on the mass of the H envelope before the explosion. If the star exploded as a genuine supernova (SN), 2015bh would be a remarkable case of a successful explosion after black hole formation in a star with a possible minimum mass 35M at the pre-SN stage.

Abstract Copyright: © ESO 2018

Journal keyword(s): supernovae: general - stars: evolution - supernovae: individual: SN2015bh - supernovae: individual: SN2009ip - stars: massive

Simbad objects: 30

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Number of rows : 30

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 UGC 273 G 00 28 06.540 +25 59 49.08   17       ~ 11 0
2 iPTF 13iqb SN* 00 34 04.84 -09 42 17.9           SNIIn 47 0
3 SN 2005gl SN* 00 49 50.02 +32 16 56.8       17.0   SNIIn 122 2
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9446 1
5 HD 5980 WR* 00 59 26.5847969465 -72 09 53.927725716   11.13 11.31   11.029 WN4+O7I: 359 1
6 HD 5890 ** 01 01 24.54661 +61 02 35.5722   9.35 8.91 8.95   F6 19 0
7 SN 1961V SN* 02 43 36.42 +37 20 43.6   12.7 12.5     SNIIpec? 199 2
8 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5669 1
9 SN 2005gj SN* 03 01 11.96 -00 33 13.9   18.6       SNIapec 173 1
10 SN 2006gy SN* 03 17 27.06 +41 24 19.5       14.20   SNIIn 285 1
11 NAME UGC 2773 OT2009-1 SN? 03 32 07.24 +47 47 39.6           ~ 42 1
12 SN 2016jbu SN* 07 36 25.98 -69 32 55.4           SNII 6 0
13 SN 2002kg SN* 07 37 01.83 +65 34 29.3     19     SNIIn? 60 3
14 SN 2015bh SN* 09 09 34.96 +33 07 20.4           SNIIn 32 1
15 PTF 13efv ev 09 09 34.96 +33 07 20.4           ~ 5 0
16 SN 2010jl SN* 09 42 53.33 +09 29 41.8           SNIIn 188 1
17 HD 90177 s*b 10 22 53.8426931454 -59 37 28.361118869 9.16 9.66 8 8.15   LBV 303 0
18 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2201 0
19 SN 1988Z SN* 10 51 50.10 +16 00 00.5   16.8       SNIIn 336 1
20 SN 2000ch SN* 10 52 41.40 +36 40 09.5     17.4     SNIIn? 84 2
21 V* AG Car WR* 10 56 11.5779283438 -60 27 12.809532379 7.00 7.57 6.96 7.73   WN11h 590 0
22 SN 1998S SN* 11 46 06.13 +47 28 55.4     12.2     SNIIn 376 1
23 SN 1994W SN* 12 02 10.92 +62 08 32.7     13.3     SNIInP 168 1
24 SN 2016bdu SN* 13 10 13.950 +32 31 14.07           SNIIn 4 0
25 SN 2013cu SN* 14 33 58.97 +40 14 20.7           SNII: 56 1
26 PSN J14595947+0154262 SN? 14 59 59.47 +01 54 26.6           ~ 23 1
27 [GMC99] D6 s*b 17 46 17.982 -28 49 03.46           LBV 54 0
28 HD 316285 s*b 17 48 14.0369781568 -28 00 53.124817157 11.88 11.27 9.60 9.28   B0Ieq 179 2
29 SN 2009ip s*b 22 23 08.26 -28 56 52.4           LBV 266 0
30 SN 2013fs SN* 23 19 44.70 +10 11 05.0           SNIIP 57 1

    Equat.    Gal    SGal    Ecl

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2020.07.10-01:45:21

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