2022A&A...666A..79F -
Astronomy and Astrophysics, volume 666A, 79 (2022/10-1)
SN 2019zrk, a bright SN 2009ip analog with a precursor.
FRANSSON C., SOLLERMAN J., STROTJOHANN N.L., YANG S., SCHULZE S., BARBARINO C., KOOL E.C., OFEK E.O., CRELLIN-QUICK A., DE K., DRAKE A.J., FREMLING C., GAL-YAM A., HO A.Y.Q. and KASLIWAL M.M.
Abstract (from CDS):
We present photometric and spectroscopic observations of the Type IIn supernova SN 2019zrk (also known as ZTF 20aacbyec). The SN shows a > 100 day precursor, with a slow rise, followed by a rapid rise to M ≈ -19.2 in the r and g bands. The post-peak light-curve decline is well fit with an exponential decay with a timescale of ∼39 days, but it shows prominent undulations, with an amplitude of ∼1 mag. Both the light curve and spectra are dominated by an interaction with a dense circumstellar medium (CSM), probably from previous mass ejections. The spectra evolve from a scattering-dominated Type IIn spectrum to a spectrum with strong P-Cygni absorptions. The expansion velocity is high, ∼16 000 km s–1, even in the last spectra. The last spectrum ∼110 days after the main eruption reveals no evidence for advanced nucleosynthesis. From analysis of the spectra and light curves, we estimate the mass-loss rate to be ∼4 × 10–2 M⊙ yr–1 for a CSM velocity of 100 km s–1, and a CSM mass of 1 M⊙. We find strong similarities for both the precursor, general light curve, and spectral evolution with SN 2009ip and similar SNe, although SN 2019zrk displays a brighter peak magnitude. Different scenarios for the nature of the 09ip-class of SNe, based on pulsational pair instability eruptions, wave heating, and mergers, are discussed.
Abstract Copyright:
© C. Fransson et al. 2022
Journal keyword(s):
supernovae: general - supernovae: individual: ZTF20aacbyec, SN 2019zrk, SN 2009ip - circumstellar matter
VizieR on-line data:
<Available at CDS (J/A+A/666/A79): photom.dat listsp.dat sp/*>
Simbad objects:
18
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