2020A&A...635A.186P


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.30CET22:18:08

2020A&A...635A.186P - Astronomy and Astrophysics, volume 635A, 186-186 (2020/3-1)

The rise and fall of an extraordinary Ca-rich transient. The discovery of ATLAS19dqr/SN 2019bkc.

PRENTICE S.J., MAGUIRE K., FLORS A., TAUBENBERGER S., INSERRA C., FROHMAIER C., CHEN T.W., ANDERSON J.P., ASHALL C., CLARK P., FRASER M., GALBANY L., GAL-YAM A., GROMADZKI M., GUTIERREZ C.P., JAMES P.A., JONKER P.G., KANKARE E., LELOUDAS G., MAGEE M.R., MAZZALI P.A., NICHOLL M., PURSIAINEN M., SKILLEN K., SMARTT S.J., SMITH K.W., VOGL C. and YOUNG D.R.

Abstract (from CDS):

This work presents the observations and analysis of ATLAS19dqr/SN 2019bkc, an extraordinary rapidly evolving transient event located in an isolated environment, tens of kiloparsecs from any likely host. Its light curves rise to maximum light in 5-6 d and then display a decline of Δm15∼5mag. With such a pronounced decay, it has one of the most rapidly evolving light curves known for a stellar explosion. The early spectra show similarities to normal and "ultra-stripped" type Ic SNe, but the early nebular phase spectra, which were reached just over two weeks after explosion, display prominent calcium lines, marking SN 2019bkc as a Ca-rich transient. The Ca emission lines at this phase show an unprecedented and unexplained blueshift of 10000-12000km/s. Modelling of the light curve and the early spectra suggests that the transient had a low ejecta mass of 0.2-0.4M and a low kinetic energy of (2-4)x1050erg, giving a specific kinetic energy Ek/Mej∼1[1051erg]/M. The origin of this event cannot be unambiguously defined. While the abundance distribution used to model the spectra marginally favours a progenitor of white dwarf origin through the tentative identification of ArII, the specific kinetic energy, which is defined by the explosion mechanism, is found to be more similar to an ultra-stripped core-collapse events. SN 2019bkc adds to the diverse range of physical properties shown by Ca-rich events.

Abstract Copyright: © ESO 2020

Journal keyword(s): supernovae: individual: SN 2019bkc

Simbad objects: 33

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Number of rows : 33

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 OGLE 2013-SN-79 SN* 00 35 10.20 -67 41 08.5           SNI 11 0
2 iPTF 16hgs ev 00 50 51.39 +27 22 48.0           ~ 7 0
3 SN 2005E SN* 02 39 14.34 +01 05 55.0     16.8     SNIb/c 107 1
4 SN 2005ek SN* 03 05 48.96 +36 46 10.6     17.5     SNIc: 53 1
5 SN 2010X SN* 04 48 27.90 +73 28 14.8           SNIc 63 1
6 SN 2002bj SN* 05 11 46.41 -15 08 10.8     14.8     SNIIn 71 1
7 SN 2012hn SN* 06 42 42.55 -27 26 49.8           SNIcPec 24 1
8 PS1-11qr ev 09 56 41.767 +01 53 38.25           ~ 15 0
9 2dFGRS TGN216Z103 G 09 59 59.2 -03 03 00   17.887   16.650   ~ 3 0
10 NGC 3086 GiG 10 00 10.9922656129 -02 58 34.264844513   14.5       ~ 21 0
11 2dFGRS TGN216Z089 GiC 10 00 14.6979746137 -02 59 23.303213385   16.866   15.563   ~ 5 0
12 2dFGRS TGN216Z084 G 10 00 18.9 -03 00 08   18.175   16.957   ~ 4 0
13 2dFGRS TGN216Z085 G 10 00 19.05 -03 04 51.4   19.369   18.484   ~ 2 0
14 SN 2019bkc SN* 10 00 22.544 -03 01 12.64           ~ 9 0
15 2dFGRS TGN216Z082 G 10 00 23.19 -02 59 44.9   19.166   18.118   ~ 2 0
16 2dFGRS TGN216Z079 G 10 00 25.87 -02 59 01.4   19.357   18.049   ~ 2 0
17 6dFGS gJ100027.0-025650 GiC 10 00 26.9517099100 -02 56 50.051416519   16.31   15.10   ~ 13 0
18 2dFGRS TGN216Z080 G 10 00 27.17 -03 01 15.2   19.056   17.879   ~ 3 0
19 NGC 3090 GiC 10 00 30.24 -02 58 06.3   14.2       ~ 39 0
20 2dFGRS TGN217Z150 GiC 10 00 33.2 -02 59 35   17.640   16.595   ~ 3 0
21 NAME NGC 3090 Group GrG 10 00 37.93 -02 57 45.3     13.88     ~ 46 0
22 2dFGRS TGN216Z072 GiC 10 00 41.4813223138 -02 57 22.735427534   16.134   14.737   ~ 15 0
23 2dFGRS TGN216Z069 G 10 00 41.7 -03 02 30   17.731   16.973   ~ 3 0
24 NGC 3092 GiG 10 00 47.4348413892 -03 00 44.638829830   14.5       ~ 26 0
25 2dFGRS TGN217Z145 GiC 10 00 48.794 -03 02 24.15   16.252   14.975   ~ 7 0
26 PSN J10520833+3256394 SN? 10 52 08.33 +32 56 39.4           ~ 10 0
27 PTF 12bho SN* 13 01 16.645 +28 01 18.50           ~ 7 0
28 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 928 0
29 SN 1994I SN* 13 29 54.072 +47 11 30.50     12.9     SNIc 571 1
30 SN 2018cow SN* 16 16 00.254 +22 16 05.10           SNIb 87 0
31 SN 2010et SN* 17 16 54.08 +31 33 50.6           ~ 14 1
32 PS1-10bjp ? 23 26 21.402 -01 31 23.11           ~ 13 0
33 SN 2014ft SN* 23 33 27.95 +33 38 46.1           ~ 18 0

    Equat.    Gal    SGal    Ecl

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2020.11.30-22:18:08

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