J/A+A/666/A79 SN 2019zrk photometry and spectroscopy (Fransson+, 2022)
SN 2019zrk, a bright SN 2009ip analogue 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., Kasliwal M.M.
<Astron. Astrophys. 666, A79 (2022)>
=2022A&A...666A..79F 2022A&A...666A..79F (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry ; Spectra, optical ; Spectra, infrared
Keywords: supernovae: general -
supernovae: individual: ZTF20aacbyec, SN2019zrk , SN2009ip -
circumstellar matter
Abstract:
We present photometric and spectroscopic observations of the Type IIn
supernova SN 2019zrk (a.k.a. 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 fitted
with an exponential decay with a time scale of ∼39 days, but shows
prominent undulations, with an amplitude of ∼1mag. Both the light
curve and spectra are dominated by interaction with a dense
circumstellar medium (CSM), probably from previous mass ejections. The
spectra evolves from a scattering-dominated Type IIn spectrum to a
spectrum with strong P-Cygni absorptions. The expansion velocity is
high, ∼16000km/s, 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 ∼4x10-2M☉/yr for a CSM
velocity of 100km/s, and a CSM mass of ≳1M☉. We find strong
similarities of 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.
Description:
SN 2019zrk (also known as ZTF 20aacbyec) was first detected on
December 20, 2019 (JDSN2019zrkdiscovery=2458838.018), with the
Palomar Schmidt 48-inch (P48) Samuel Oschin telescope as part of the
Zwicky Transient Facility (ZTF) survey (Bellm et al.
2019PASP..131a8002B 2019PASP..131a8002B; Graham et al., 2019PASP..131f8001P 2019PASP..131f8001P). It was
reported to the Transient Name Server (TNS1) on January 3, 2020. That
first detection was in the g band, with a host-subtracted magnitude of
20.18±0.31mag, at the J2000.0 coordinates
RA=11:39:47.38, DE=+19:55:46.6.
Objects:
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RA (2000) DE Designation(s)
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11 39 47.399 +19 55 46.73 SN 2019zrk
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
photom.dat 54 255 Photometry of SN 2019zrk (table 1)
listsp.dat 52 14 List of spectra
sp/* . 14 Individual spectra
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See also:
https://www.wiserep.org/object/14173 : SN2019zrk spectra on WISeREP
Byte-by-byte Description of file: photom.dat
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Bytes Format Units Label Explanations
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1- 10 F10.2 d JD Julian Date
12 A1 --- Filter [ugriz] Filter name
14- 20 F7.2 d Phase [-96.49/377.28] Rest Frame Phase
22- 26 F5.2 mag mag ?=99 Apparent magnitude in Filter
28- 32 F5.2 mag e_mag ?=99 Error of magnitude in Filter
34- 38 F5.2 mag limmag ?=99 Limiting magnitude in Filter
40- 45 F6.2 mag MAG Absolute magnitude in Filter
47- 54 A8 --- Inst Instrument name
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Byte-by-byte Description of file: listsp.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- FileName Name of the spectrum file in subdirectory sp
20- 24 A5 --- Inst Instrument
26- 35 A10 "date" Obs.date Observation date
37- 43 F7.2 0.1nm blambda Lower value of wavelength interval
45- 52 F8.2 0.1nm Blambda Upper value of wavelength interval
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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1- 7 F7.1 0.1nm lambda Wavelength
9- 30 E22.17 10mW/m2/nm Flux [0.0/0.01] Normalised flux (erg/cm2/s/Å)
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Acknowledgements:
Sheng Yang, sheng.yang(at)astro.su.se
(End) Patricia Vannier [CDS] 16-Feb-2022