2019ApJ...887..169H


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET12:51:31

2019ApJ...887..169H - Astrophys. J., 887, 169-169 (2019/December-3)

Evidence for late-stage eruptive mass loss in the progenitor to SN2018gep, a broad-lined IC supernova: pre-explosion emission and a rapidly rising luminous transient.

HO A.Y.Q., GOLDSTEIN D.A., SCHULZE S., KHATAMI D.K., PERLEY D.A., ERGON M., GAL-YAM A., CORSI A., ANDREONI I., BARBARINO C., BELLM E.C., BLAGORODNOVA N., BRIGHT J.S., BURNS E., CENKO S.B., CUNNINGHAM V., DE K., DEKANY R., DUGAS A., FENDER R.P., FRANSSON C., FREMLING C., GOLDSTEIN A., GRAHAM M.J., HALE D., HORESH A., HUNG T., KASLIWAL M.M., KUIN N.P.M., KULKARNI S.R., KUPFER T., LUNNAN R., MASCI F.J., NGEOW C.-C., NUGENT P.E., OFEK E.O., PATTERSON M.T., PETITPAS G., RUSHOLME B., SAI H., SFARADI I., SHUPE D.L., SOLLERMAN J., SOUMAGNAC M.T., TACHIBANA Y., TADDIA F., WALTERS R., WANG X., YAO Y. and ZHANG X.

Abstract (from CDS):

We present detailed observations of ZTF18abukavn (SN2018gep), discovered in high-cadence data from the Zwicky Transient Facility as a rapidly rising (1.4 ± 0.1 mag hr–1) and luminous (Mg,peak=-20 mag) transient. It is spectroscopically classified as a broad-lined stripped-envelope supernova (Ic-BL SN). The high peak luminosity (Lbol≳3×1044ergs–1), the short rise time (trise=3days in g band), and the blue colors at peak (g–r∼-0.4) all resemble the high-redshift Ic-BL iPTF16asu, as well as several other unclassified fast transients. The early discovery of SN2018gep (within an hour of shock breakout) enabled an intensive spectroscopic campaign, including the highest-temperature (Teff≳40,000K) spectra of a stripped-envelope SN. A retrospective search revealed luminous (Mg∼Mr~-14 mag) emission in the days to weeks before explosion, the first definitive detection of precursor emission for a Ic-BL. We find a limit on the isotropic gamma-ray energy release E_γ,iso_< 4.9×1048erg, a limit on X-ray emission LX< 1040ergs–1, and a limit on radio emission νLν≲1037ergs–1. Taken together, we find that the early (< 10days) data are best explained by shock breakout in a massive shell of dense circumstellar material (0.02 M) at large radii (3×1014cm) that was ejected in eruptive pre-explosion mass-loss episodes. The late-time (> 10days) light curve requires an additional energy source, which could be the radioactive decay of Ni-56.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): methods: observational - shock waves - stars: mass-loss - supernovae: individual - surveys

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

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 - 2021
#notes
1 SN 2016gkg SN* 01 34 14.40 -29 26 24.2           SNIIb 48 0
2 SN 2002ap SN* 01 36 23.85 +15 45 13.2   13.11 14.54     SNIc-BL 499 1
3 SN 2006aj SN* 03 21 39.670 +16 52 02.27 17.96 19.11 17.40     SNIc-BL 839 1
4 SN 2010bh SN* 07 10 30.63 -56 15 19.7           SNIc 236 1
5 SN 2003lw SN* 08 02 30.1 -39 51 03       20.23   SNIc: 510 0
6 SN 2008D SN* 09 09 30.625 +33 08 20.16     17.5     SNIb 341 1
7 GRB 171205A gB 11 09 39.49 -12 35 18.7           ~ 80 0
8 iPTF 16asu SN* 12 59 09.28 +13 48 09.2           SNIc 24 0
9 PTF 11qcj SN* 13 13 41.51 +47 17 57.0           SNIb 34 0
10 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3792 1
11 KSN 2015k SN* 13 31 51.60 -10 44 09.6           ~ 17 0
12 PTF 12dam SN* 14 24 46.20 +46 13 48.3           SLSNIc 114 0
13 SN 2018cow SN* 16 16 00.254 +22 16 05.10           SNIb 88 0
14 6C 163852+395305 QSO 16 40 29.632771800 +39 46 46.02850331   18.4 16.5 18.75   ~ 276 2
15 3C 345 QSO 16 42 58.8100340220 +39 48 36.999540578   16.81 16.59 16.84   ~ 1564 2
16 SN 2018gep SN* 16 43 48.2 +41 02 43           SNIc 15 0
17 [VV98] J164656.9+405917 QSO 16 46 56.8587021 +40 59 17.172048   19.34 19.20 19.38   ~ 46 1
18 SN 1998bw SN* 19 35 03.17 -52 50 46.1   14.09       SNIc 1666 2
19 LSQ 12dwl SN* 22 12 41.53 +00 30 43.1           SNIc 34 1
20 PTF 10vgv SN* 22 16 01.17 +40 52 03.3           SNIc 20 0
21 3C 454.3 QSO 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2537 2
22 SN 2013fs SN* 23 19 44.70 +10 11 05.0           SNIIP 62 1
23 SN 2014ft SN* 23 33 27.95 +33 38 46.1           ~ 18 0

    Equat.    Gal    SGal    Ecl

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2020.12.02-12:51:31

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