2019ApJ...885L..23M


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.30CET22:25:50

2019ApJ...885L..23M - Astrophys. J., 885, L23-L23 (2019/November-1)

SN2018kzr: a rapidly declining transient from the destruction of a white dwarf.

McBRIEN O.R., SMARTT S.J., CHEN T.-W., INSERRA C., GILLANDERS J.H., SIM S.A., JERKSTRAND A., REST A., VALENTI S., ROY R., GROMADZKI M., TAUBENBERGER S., FLORS A., HUBER M.E., CHAMBERS K.C., GAL-YAM A., YOUNG D.R., NICHOLL M., KANKARE E., SMITH K.W., MAGUIRE K., MANDEL I., PRENTICE S., RODRIGUEZ O., PINEDA GARCIA J., GUTIERREZ C.P., GALBANY L., BARBARINO C., CLARK P.S.J., SOLLERMAN J., KULKARNI S.R., DE K., BUCKLEY D.A.H. and RAU A.

Abstract (from CDS):

We present SN2018kzr, the fastest declining supernova-like transient, second only to the kilonova, AT2017gfo. SN2018kzr is characterized by a peak magnitude of Mr = -17.98, a peak bolometric luminosity of ∼1.4 x 1043 erg s–1, and a rapid decline rate of 0.48 ± 0.03 mag day–1 in the r band. The bolometric luminosity evolves too quickly to be explained by pure 56Ni heating, necessitating the inclusion of an alternative powering source. Incorporating the spin-down of a magnetized neutron star adequately describes the lightcurve and we estimate a small ejecta mass of Mej = 0.10 ± 0.05 M. Our spectral modeling suggests the ejecta is composed of intermediate mass elements including O, Si, and Mg and trace amounts of Fe-peak elements, which disfavors a binary neutron star merger. We discuss three explosion scenarios for SN2018kzr, given the low ejecta mass, intermediate mass element composition, and high likelihood of additional powering-the core collapse of an ultra-stripped progenitor, the accretion induced collapse (AIC) of a white dwarf, and the merger of a white dwarf and neutron star. The requirement for an alternative input energy source favors either the AIC with magnetar powering or a white dwarf-neutron star merger with energy from disk wind shocks.

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

Journal keyword(s): Magnetars - Supernovae - White dwarf stars

Simbad objects: 14

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Number of rows : 14

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 2005E SN* 02 39 14.34 +01 05 55.0     16.8     SNIb/c 107 1
2 SN 2005ek SN* 03 05 48.96 +36 46 10.6     17.5     SNIc: 53 1
3 SN 2010X SN* 04 48 27.90 +73 28 14.8           SNIc 63 1
4 SN 2002bj SN* 05 11 46.41 -15 08 10.8     14.8     SNIIn 71 1
5 SN 2018kzr SN* 08 28 53.460 +01 06 38.71           SNIc 6 0
6 SDSS J082853.48+010638.6 G 08 28 53.48088 +01 06 38.6784           ~ 1 0
7 SN 2019bkc SN* 10 00 22.544 -03 01 12.64           ~ 9 0
8 SN 2018byg SN* 12 23 21.57 +46 36 08.3           SNIa-pec 11 0
9 iPTF 16asu SN* 12 59 09.28 +13 48 09.2           SNIc 23 0
10 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 928 0
11 SN 2002cx SN* 13 13 49.72 +06 57 31.9   17.68       SNIapec 196 1
12 KSN 2015k SN* 13 31 51.60 -10 44 09.6           ~ 17 0
13 SN 2018cow SN* 16 16 00.254 +22 16 05.10           SNIb 87 0
14 SN 2014ft SN* 23 33 27.95 +33 38 46.1           ~ 18 0

    Equat.    Gal    SGal    Ecl

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2020.11.30-22:25:50

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