J/ApJ/925/217 Optical phot. and sp. monitoring of SN 2020sck (Dutta+, 2022)
SN 2020sck: deflagration in a Carbon-Oxygen white dwarf.
Dutta A., Sahu D.K., Anupama G.C., Joharle S., Kumar B., Nayana J. A,
Singh A., Kumar H., Bhalerao V., Barway S.
<Astrophys. J., 925, 217 (2022)>
=2022ApJ...925..217D 2022ApJ...925..217D
ADC_Keywords: Supernovae; Spectra, optical; Photometry, UBVRI
Keywords: Supernovae
Abstract:
We present optical UBVRI photometry and low-to-medium resolution
spectroscopic observations of type Iax supernova SN 2020sck spanning
-5.5 days to +67 days from maximum light in the B-band. From the
photometric analysis we find ΔmB(15)=2.03±0.05mag and
MB=-17.81±0.22mag. Radiation diffusion model fit to the
quasi-bolometric light curve indicates 0.13±0.02M☉ of 56Ni
and 0.34M☉ of ejecta are synthesized in the explosion. Comparing
the observed quasi-bolometric light curve with the angle-averaged
bolometric light curve of a three-dimensional pure deflagration
explosion of Mch carbon-oxygen white dwarf, we find agreement with a
model in which 0.16M☉ of 56Ni and 0.37M☉ of ejecta is
formed. By comparing the +1.4 days spectrum of SN 2020sck with
synthetic spectrum generated using SYN++, we find absorption features
due to CII, CIII, and OI. These are unburned materials in the
explosion and indicate a C-O white dwarf. One- dimensional radiative
transfer modeling of the spectra with TARDIS shows higher density in
the ejecta near the photosphere and a steep decrease in the outer
layers with an ejecta composition dominated mostly by C, O, Si, Fe,
and Ni. The star-formation rate of the host galaxy computed from the
luminosity of the Hα (λ6563) line is 0.09M☉/yr,
indicating a relatively young stellar environment.
Description:
Imaging of SN 2020sck in Bessell's UBVRI bands was carried out with
the Himalayan Faint Object Spectrograph Camera (HFOSC) mounted on the
2.0m Himalayan Chandra Telescope (HCT) located at the Indian
Astronomical Observatory (IAO) at Hanle, India. Photometric
observations with HCT started on 2020 August 31, at 5.4 days before
B-band maximum and continued until 2020 November 13.
SN 2020sck was followed up in SDSS-r'-filter with the 0.7m fully
robotic GROWTH-India Telescope (GIT) at IAO. The observations began on
2020 September 07 and continued until 2020 November 23.
Late phase observations of SN 2020sck was carried out with the
ARIES-Devasthal Faint Object Spectrograph and Camera mounted on the
axial port of the 3.6m Devasthal Optical Telescope (DOT). Imaging in
SDSS-g, r, and i bands was performed on 2021 January 11.
Spectroscopic monitoring of SN 2020sck with HCT started on
2020-October-31 (JD=2459093.31) and continued until 2020-October-03
(JD=2459126.34). Low-medium-resolution spectra were obtained using
grisms Gr7 (3500-7800Å) and Gr8 (5200-9100Å) available with
HFOSC. The log of spectroscopic observations is provided in Table 9.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
01 10 34.84 +02 06 50.1 SN 2020sck = ZTF20abwrcmq
----------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
fig2.dat 48 115 HCT, GIT and DOT photometry of SN 2020sck
table9.dat 43 13 Log of spectroscopic observations of SN 2020sck
from the 2.0m Himalayan Chandra Telescope (HCT)
sp/* . 13 Individual spectra in ASCII format
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See also:
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/A+A/333/231 : O-M stars model atmospheres (Bessell+ 1998)
J/MNRAS/383/1485 : BVRI light curves of SN 2003jd (Valenti+, 2008)
J/ApJ/699/L139 : Spectral parameters of SNe Ia (Wang+, 2009)
J/A+A/561/A146 : SN 2010ae optical spectra (Stritzinger+, 2014)
J/MNRAS/446/3895 : The rising light curves of Type Ia supernovae (Firth+, 2015)
J/A+A/675/A195 : ZTF DR11 classif. in ZTF/4MOST sky (Sanchez-Saez+, 2023)
Byte-by-byte Description of file: fig2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- Tel Telescope (1)
5- 14 F10.2 d JD Julian Date of observation
16- 25 A10 "Y/M/D" Date Observation Date
27- 32 F6.2 d Phase [-5.38/127.56] Phase; time since B-band
maximum (2459098.84)
34- 35 A2 --- Filt Filter (UBVRIgrir')
37- 42 F6.3 mag omag [16/21.4] Observed magnitude in Filt
44- 48 F5.3 mag e_omag [0.005/0.3] Uncertainty in omag
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Note (1): Telescope as follows:
HCT = the Himalayan Faint Object Spectrograph Camera (HFOSC) mounted on
the 2.0m Himalayan Chandra Telescope located at the Indian
Astronomical Observatory (IAO) at Hanle, India (84 occurrences)
GIT = the 0.7m fully robotic GROWTH-India Telescope at IAO, equipped with a
2148x1472pix Apogee Camera (28 occurrences)
DOT = the ARIES-Devasthal Faint Object Spectrograph and Camera mounted on
the axial port of the 3.6m Devasthal Optical Telescope (3 occurrences)
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Byte-by-byte Description of file: table9.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 F6.2 d JD [93.31/126.34] Julian Date; JD-2459000
8- 17 A10 "Y/M/D" Date Date of observation (UT)
19- 23 F5.2 d Phase [-5.53/27.5] Phase; time since B-band maximum
(JD2459098.84)
25- 33 A9 0.1nm Range1 Wavelength range in Å (grism Gr7)
35- 43 A9 0.1nm Range2 Wavelength range in Å (grism Gr8)
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History:
From electronic version of the journal for Figure 2
Final paper spectra downloaded at: http://zenodo.org/record/5619721
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 11-Sep-2023