J/ApJ/930/127 Spectra of the type Ibn SN 2019wep (Gangopadhyay+, 2022)
Evolution of a peculiar type Ibn supernova SN 2019wep.
Gangopadhyay A., Misra K., Hosseinzadeh G., Arcavi I., Pellegrino C.,
Wang X., Andrew Howell D., Burke J., Zhang J., Kawabata K., Singh M.,
Dastidar R., Hiramatsu D., McCully C., Mo J., Chen Z., Xiang D.
<Astrophys. J., 930, 127 (2022)>
=2022ApJ...930..127G 2022ApJ...930..127G
ADC_Keywords: Supernovae; Spectra, optical
Keywords: Supernovae ; Supernova dynamics ; Core-collapse supernovae ;
CCD photometry ; Spectroscopy
Abstract:
We present a high-cadence short term photometric and spectroscopic
monitoring campaign of a type Ibn SN 2019wep, which is one of the rare
SN Ibn after SNe 2010al and 2019uo to display signatures of flash
ionization (HeII, CIII, NIII). We compare the decline rates and rise
time of SN 2019wep with other SNe Ibn and fast transients. The
post-peak decline in all bands (0.1mag/day) are consistent with
SNe Ibn but less than the fast transients. On the other hand, the
Δm15 values are slightly lower than the average values for
SNe Ibn but consistent with the fast transients. The rise time is
typically shorter than SNe Ibn but longer than fast transients.
SN2019wep lies at the fainter end of SNe Ibn but possesses an average
luminosity among the fast transients sample. The peculiar color
evolution places it between SNe Ib and the most extreme SNe Ibn. The
bolometric light-curve modeling shows resemblance with SN 2019uo with
ejecta masses consistent with SNe Ib. SN 2019wep belongs to the
P cygni subclass of SNe Ibn and shows faster evolution in line
velocities as compared to the emission subclass. The post-maximum
spectra show close resemblance with ASASSN-15ed hinting it to be of
SNIb nature. The low HeI CSM velocities and residual Hα further
justifies it and provide evidence of an intermittent progenitor
between Wolf-Rayet and LBV stars.
Description:
We observed SN 2019wep with the 2m Las Cumbres Observatory (LCO)
telescopes in the UBVgri filters from ∼3-98days after explosion under
the Global Supernovae Project program. The photometric observations in
UBVRI/ugri were also taken with the 0.8m Tsinghua-NAOC Telescope
(TNT), Xinglong Observatory, China.
The spectroscopic observations of SN 2019wep were taken at 9 epochs
spanning up to ∼22days after explosion with the 2.0m FTN and FTS
telescopes of the LCO and 2.4m LJT of Yunnan Observatories, China.
Objects:
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RA (ICRS) DE Designation(s)
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11 04 37.03 +45 58 38.9 SN 2019wep = AT 2019wep
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 47 12 Log of spectroscopic observations of SN 2019wep
fig6.dat 32 29139 Spectra of SN 2019wep
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See also:
J/MNRAS/416/3138 : SN 2009jf light curves (Valenti+, 2011)
J/ApJ/769/39 : SN Ibn PS1-12sk optical & NIR light curves (Sanders+, 2013)
J/A+A/555/A10 : Light curves of 5 type IIn supernovae (Taddia+, 2013)
J/ApJ/794/23 : Pan-STARRS1 transients optical photometry (Drout+, 2014)
J/AJ/147/99 : Spectroscopy of stripped core-collapse SNe (Modjaz+, 2014)
J/MNRAS/438/L101 : First month on SN 2013ej (Valenti+, 2014)
J/MNRAS/449/1921 : UV/opt/NIR photometry for Type Ibn SNe (Pastorello+, 2015)
J/MNRAS/453/3649 : Photometric data for ASASSN-15ed (Pastorello+, 2015)
J/MNRAS/449/1941 : Opt/NIR photometry of OGLE-2012-SN-006 (Pastorello+, 2015)
J/ApJ/819/35 : LCs of four transients from PTF & SNLS (Arcavi+, 2016)
J/MNRAS/459/3939 : Type II supernova light curves (Valenti+, 2016)
J/MNRAS/481/894 : Rapidly evolving transients in the DES (Pursiainen+, 2018)
J/A+A/637/A73 : Type IIn supernova photometry (Nyholm+, 2020)
J/ApJ/918/63 : Fast-transients confirmed by ZTFReST & LCs (Andreoni+, 2021)
J/ApJ/907/99 : Pre-explosion light curve of supernovae (Strotjohann+, 2021)
J/ApJ/917/97 : Spectroscopic obs. of type Ibn ASASSN-14ms (Wang+, 2021)
J/ApJ/910/42 : LCs and spectroscopic obs. of AT2018cow (Xiang+, 2021)
J/other/Nat/601.201 : Photometry of SN 2019hgp (Gal-Yam+, 2022)
J/ApJ/926/125 : Fast-evolving SNIbn with LCO & FLOYDS (Pellegrino+, 2022)
J/ApJ/927/180 : Type Icn SN2021csp photometry & spectra (Perley+, 2022)
J/A+A/675/A195 : ZTF DR11 classif. in ZTF/4MOST sky (Sanchez-Saez+, 2023)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 F4.1 --- Phase [-2.9/18.3] Phase, measured with respect to
V-max (MJDmax=58828.5)
6- 8 A3 --- Tel Telescope code (G1)
10- 28 A19 --- Inst Instrument
30- 38 A9 0.1nm Range Wavelength range in Angstroms
40- 47 A8 "Y/M/D" Date Observation date (UT) as in fig6.dat;
column added by CDS
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Byte-by-byte Description of file: fig6.dat
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Bytes Format Units Label Explanations
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1- 8 A8 "Y/M/D" Date Observation date (UT)
10- 12 A3 --- Tel Telescope code (G1)
14- 21 F8.3 0.1nm lambda [3411.18/9757.13] Wavelength; Angstroms
23- 32 E10.3 cW/m2/nm Flux [-1.2e-15/7.7e-15] Flux; erg/s/cm2/Angstrom
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Global notes:
Note (G1): Telescope as follows:
LJT = The 2.4m Li-Jiang Telescope 130 (LJT+YFOSC) of
Yunnan Observatories, China.
FTN = Las Cubres Observatory 2.0m Faulkes Telescope North
at Haleakala Observatory, USA.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 19-Mar-2024