2021ApJ...917...63A


Query : 2021ApJ...917...63A

2021ApJ...917...63A - Astrophys. J., 917, 63-63 (2021/August-3)

The blue supergiant progenitor of the supernova imposter AT 2019krl.

ANDREWS J.E., JENCSON J.E., VAN DYK S.D., SMITH N., NEUSTADT J.M.M., SAND D.J., KRECKEL K., KOCHANEK C.S., VALENTI S., STRADER J., BERSTEN M.C., BLANC G.A., BOSTROEM K.A., BRINK T.G., EMSELLEM E., FILIPPENKO A.V., FOLATELLI G., KASLIWAL M.M., MASCI F.J., McELROY R., MILISAVLJEVIC D., SANTORO F. and SZALAI T.

Abstract (from CDS):

Extensive archival Hubble Space Telescope, Spitzer Space Telescope, and Large Binocular Telescope imaging of the recent intermediate-luminosity transient, AT 2019krl in M74, reveal a bright optical and mid-infrared progenitor star. While the optical peak of the event was missed, a peak was detected in the infrared with an absolute magnitude of M_4.5 µm_ = -18.4 mag, leading us to infer a visual-wavelength peak absolute magnitude of -13.5 to -14.5. The pre-discovery light curve indicated no outbursts over the previous 16 yr. The colors, magnitudes, and inferred temperatures of the progenitor best match a 13-14 M yellow or blue supergiant (BSG) if only foreground extinction is taken into account, or a hotter and more massive star if any additional local extinction is included. A pre-eruption spectrum of the star reveals strong Hα and [N II] emission with wings extending to ±2000 km s–1. The post-eruption spectrum is fairly flat and featureless with only Hα, Na I D, [Ca II], and the Ca II triplet in emission. As in many previous intermediate-luminosity transients, AT 2019krl shows remarkable observational similarities to luminous blue variable (LBV) giant eruptions, SN 2008S-like events, and massive-star mergers. However, the information about the pre-eruption star favors either a relatively unobscured BSG or a more extinguished LBV with M > 20 M likely viewed pole-on.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Massive stars - Supergiant stars - Evolved stars - Eruptive variable stars - Luminous blue variable stars

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 M31N 2015-01a No* 00 42 07.99 +40 55 01.1           ~ 58 0
2 NAME NGC 300 OT2008-1 ev 00 54 34.16 -37 38 28.6           ~ 123 1
3 SN 2002ap SN* 01 36 23.85 +15 45 13.2   13.11 14.54     SNIc-BL 563 1
4 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1730 1
5 SN 2003gd SN* 01 36 42.65 +15 44 19.9     13.2     SNIIP 247 2
6 SN 2013ej SN* 01 36 48.16 +15 45 31.0           SNIIP 198 0
7 AT 2019krl SN? 01 36 49.629 +15 46 46.07           ~ 11 0
8 NAME UGC 2773 OT2009-1 SN? 03 32 07.24 +47 47 39.6           ~ 55 1
9 V* V838 Mon No* 07 04 04.8221494992 -03 50 50.648894412       15.181 14.51 M10+B3V 426 0
10 SN 1954J SN* 07 36 56.20 +65 37 52.3   16.3 16.50     SNIIpec? 93 2
11 AT 2017be ev 08 13 13.38 +45 59 16.8           ~ 14 0
12 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 LBV 2435 0
13 SN 2002bu SN* 12 17 37.18 +45 38 47.4     15.5     SNIIn? 55 2
14 PTF 10fqs SN* 12 18 50.16 +14 26 39.2       20.0   ~ 35 0
15 SN 2017jfs SN* 12 29 37.78 +07 49 35.1           SNIIn 24 0
16 NAME NGC 4490-OT2011 ev 12 30 41.85 +41 37 49.8           ~ 40 0
17 NAME M51 OT2019-1 ev 13 29 42.394 +47 11 16.99           ~ 23 0
18 NAME M101 OT2015-1 SN? 14 02 16.78 +54 26 20.5   19.19 17.57 16.92 16.26 ~ 46 0
19 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2909 2
20 PSN J14595947+0154262 SN? 14 59 59.47 +01 54 26.6           ~ 38 1
21 V* V1309 Sco No* 17 57 32.9368332984 -30 43 09.965039880   16.9   14.8   ~ 258 0
22 SN 2008S ev 20 34 45.33 +60 05 58.4   19.89 18.79 17.93   SNIIn? 239 1
23 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2525 2

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