J/ApJ/927/142 Type Ia SN 2012ij opt. & NIR spectra (Li+, 2022)
SN 2012ij: a low-luminosity type Ia supernova and evidence for a continuous
distribution from a 91bg-like explosion to normal ones.
Li Z., Zhang T., Wang X., Sai H., Zhang J., Chen J., Zhao X., Yan S.,
Wang Bo, Phillips M.M., Hsiao E.Y., Morrell N., Contreras C., Burns C.R.,
Ashall C., Stritzinger M., Krisciunas K., Prieto J., Zou Hu, Wang J.,
Ma J., Nie J., Xue S., Zhou Xu, Zhou Z., Xiang D., Xi G.
<Astrophys. J., 927, 142 (2022)>
=2022ApJ...927..142L 2022ApJ...927..142L
ADC_Keywords: Supernovae; Spectra, optical; Spectra, infrared
Keywords: Type Ia supernovae ; Supernovae
Abstract:
In this paper, we present photometric and spectroscopic observations
of the subluminous Type Ia supernova (SNIa) 2012ij, which has an
absolute B-band peak magnitude MB,max=-17.95±0.15mag. The B-band
light curve exhibits a fast postpeak decline with
Δm15(B)=1.86±0.05mag. All the R- and I/i-band light curves
show a weak secondary peak/shoulder feature at about 3 weeks after the
peak, like some transitional subclass of SNe Ia, which could result
from an incomplete merger of near-infrared (NIR) double peaks. The
spectra are characterized by TiII and strong SiIIλ5972
absorption features that are usually seen in low-luminosity objects
like SN 1999by. The NIR spectrum before maximum light reveals weak
carbon absorption features, implying the existence of unburned
materials. We compare the observed properties of SN 2012ij with those
predicted by the sub- Chandrasekhar-mass and the Chandrasekhar-mass
delayed-detonation models and find that both optical and NIR spectral
properties can be explained to some extent by these two models. By
comparing the secondary maximum features in the I and i bands, we
suggest that SN 2012ij is a transitional object linking normal SNe Ia
to typical 91bg-like ones. From the published sample of SNe Ia from
the Carnegie Supernova Project II, we estimate that the fraction of SN
2012ij-like SNe Ia is not lower than ∼2%.
Description:
SN 2012ij was discovered on 2012 December 29.78 UT by the 0.6m Schmidt
telescope in the course of the THU-NAOC Transient Survey (TNTS;
Zhang+ 2015RAA....15..215Z 2015RAA....15..215Z), with an unfiltered magnitude of about 18mag.
The optical photometry (BVRI) of SN 2012ij was mainly collected by the
0.8m Tsinghua-NAOC Telescope (TNT) located at Xinglong Observatory of
NAOC. See Section 2.1.
After the discovery, extensive optical and NIR follow-up observations
were conducted for SN 2012ij at several facilities. A total of 14
spectra were obtained for SN 2012ij, including four optical spectra
from the Xinglong 2.16m Telescope (XLT), three optical spectra from
the Lijiang 2.4m Telescope (LJT), four optical spectra from the LCO du
Pont and Nordic Optical Telescope (NOT), and three NIR spectra from
the Folded-port Infrared Echellette (FIRE) mounted on the Magellan
Baade Telescope (CSP-II). A journal of spectroscopic observations is
listed in Table 2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 70 14 Journal of Spectroscopic Observations of SN 2012ij
fig7.dat 25 20458 Optical spectral evolution of SN 2012ij
fig8.dat 25 6130 NIR spectra of SN 2012ij
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See also:
I/312 : PPMX Catalog of positions and proper motions (Roeser+ 2008)
J/ApJ/645/488 : SN type Ia luminosities (Wang+, 2006)
J/ApJ/659/122 : Improved distances to type Ia supernovae (Jha+, 2007)
J/MNRAS/377/1531 : Optical & infrared phot. of SN 2004eo (Pastorello+, 2007)
J/ApJ/700/331 : Light curves of type Ia supernovae (CfA3) (Hicken+, 2009)
J/ApJ/699/L139 : Spectral parameters of SNe Ia (Wang+, 2009)
J/AJ/139/519 : Carnegie supernova project. SNe Ia (Contreras+, 2010)
J/ApJS/190/418 : Light curves for 165 SNe (Ganeshalingam+, 2010)
J/MNRAS/412/1441 : SNe luminosity functions (Li+, 2011)
J/AJ/143/126 : Spectroscopy of 462 nearby Type Ia SNe (Blondin+, 2012)
J/MNRAS/425/1789 : Berkeley supernova Ia program. I. (Silverman+, 2012)
J/ApJ/773/53 : Type Ia SNe spectroscopy by the CSP (Folatelli+, 2013)
J/other/Sci/340.170 : Classifications of 188 SNe Ia (Wang+, 2013)
J/A+A/568/A22 : Joint analysis of the SDSS-II & SNLS SNe Ia (Betoule+, 2014)
J/A+A/578/A9 : Optical and NIR spectra of SN iPTF13ebh (Hsiao+, 2015)
J/ApJS/219/13 : SNe Ia light curves for the LSQ-CSP sample (Walker+, 2015)
J/ApJS/220/20 : Si and Ca high-velocity features in SNe Ia (Zhao+, 2015)
J/MNRAS/456/2848 : Properties of 500 SNe and their 419 hosts (Hakobyan+, 2016)
J/ApJ/826/56 : HST/WFC3 obs. of Cepheids in SN Ia host gal. (Riess+, 2016)
J/AJ/154/211 : The CSP (DR3): phot. of low-z SNe Ia (Krisciunas+, 2017)
J/ApJ/869/56 : Updated calibration of the CSP-I SNeIa sample (Burns+, 2018)
J/A+A/611/A58 : SN 2007on and SN 2011iv light curves (Gall+, 2018)
J/ApJ/870/L1 : K2 obs. of type Ia supernova SN 2018oh (Dimitriadis+, 2019)
J/A+A/630/A76 : SN2016hnk photometry and spectroscopy (Galbany+, 2019)
J/MNRAS/485/2343 : r-band Type Ia supernovae (Papadogiannakis+, 2019)
J/ApJ/870/13 : K2 LC alternative analysis of ASASSN-18bt (Shappee+, 2019)
J/ApJ/914/57 : Follow-up Opt. & NIR obs. of SN2015bp (Wyatt+, 2021)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 "Y/M/D" Date Date of observation (UT)
13- 19 F7.1 d MJD [56297/56341.3] Modified Julian Date
21- 24 F4.1 --- Phase [-5.3/39] Phase relative to the epoch of the
B-band maximum (MJD=56302.3) in the frame of
the observer
26- 29 I4 0.1nm lam1 Wavelength lower range
30 A1 --- --- [-]
31- 35 I5 --- lam2 Wavelength upper range
37- 40 A4 0.1nm Res Approximate spectral resolution (FWHM intensity)
42- 70 A29 --- Inst Instrument
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Byte-by-byte Description of file: fig7.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 5 F4.1 --- Phase [-5.3/39] Time since B-band maximum
7- 14 F8.3 0.1nm lambda [3287/9656] Observed wavelength; Angstroms
16- 25 E10.3 cW/m2/nm Flux [-5e-16/5e-15] Observed flux;
erg/s/cm2/Angstroms
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Byte-by-byte Description of file: fig8.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 5 F4.1 --- Phase [-4/26] Time since B-band maximum
7- 14 F8.2 0.1nm lambda [7981/25817] Observed wavelength; Angstroms
16- 25 E10.3 cW/m2/nm Flux [-8.7e-13/9.3e-12] Observed flux;
erg/s/cm2/Angstroms
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 17-Jan-2024