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The rise and fall of an extraordinary Ca-rich transient -- The discovery of ATLAS19dqr/SN 2019bkc | | S. J. Prentice
; K. Maguire
; A. Flörs
; S. Taubenberger
; C. Inserra
; C. Frohmaier
; T. W. Chen
; J. P. Anderson
; C. Ashall
; P. Clark
; M. Fraser
; L. Galbany
; A. Gal-Yam
; M. Gromadzki
; C. P. Gutiérrez
; P. A. James
; P. G. Jonker
; E. Kankare
; G. Leloudas
; M. R. Magee
; P. A. Mazzali
; M. Nicholl
; M. Pursiainen
; K. Skillen
; S. J. Smartt
; K. W. Smith
; C. Vogl
; D. R. Young
; | | Date: |
12 Sep 2019 | | Abstract: | This work presents the observations and analysis of ATLAS19dqr/SN 2019bkc, an
extraordinary rapidly evolving transient event located in an isolated
environment, tens of kpc from any likely host. Its light curves rise to maximum
light in $5-6$ d and then display an decline of $Delta m_{15} sim5$ mag. 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, 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 10,000 -- 12,000 km/s. Modelling of
the light curve and the early spectra suggests that the transient had a low
ejecta mass of $0.2 - 0.4$ M$_{odot}$ and a low kinetic energy of $
(2-5) imes 10^{50}$ erg, giving a specific kinetic energy around unity. 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 Ar II, 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. | | Source: | arXiv, 1909.5567 | | Services: | Forum | Review | PDF | Favorites | |
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