J/ApJ/893/143 UBVRIJHK & spec. obs. of type Ia SN2019ein (Kawabata+, 2020)
SN 2019ein: new insights into the similarities and diversity among high-velocity
type Ia supernovae.
Kawabata M., Maeda K., Yamanaka M., Nakaoka T., Kawabata K.S., Adachi R.,
Akitaya H., Burgaz U., Hanayama H., Horiuchi T., Hosokawa R., Iida K.,
Imazato F., Isogai K., Jiang J.-A., Katoh N., Kimura H., Kino M., Kuroda D.,
Maehara H., Matsubayashi K., Morihana K., Murata K.L., Nagao T., Niwano M.,
Nogami D., Oeda M., Ono T., Onozato H., Otsuka M., Saito T., Sasada M.,
Shiraishi K., Sugiyama H., Taguchi K., Takahashi J., Takagi K., Takagi S.,
Takayama M., Tozuka M., Sekiguchi K.
<Astrophys. J., 893, 143 (2020)>
=2020ApJ...893..143K 2020ApJ...893..143K
ADC_Keywords: Supernovae ; Photometry, UBVRI; Photometry, infrared; Ultraviolet;
Spectra, optical
Keywords: Type Ia supernovae ; Supernovae
Abstract:
We present optical observations of the Type Ia supernova (SN) 2019ein,
starting two days after the estimated explosion date. The spectra and
light curves show that SN 2019ein belongs to a high-velocity (HV) and
broad-line group with a relatively rapid decline in the light curves
(Δm15(B)=1.36±0.02mag) and a short rise time
(15.37±0.55days). The SiIIλ6355 velocity, associated with a
photospheric component but not with a detached high-velocity feature,
reached ∼20000km/s 12 days before the B-band maximum. The line
velocity, however, decreased very rapidly and smoothly toward maximum
light, to ∼13000km/s, which is relatively low among HV SNe. This
indicates that the speed of the spectral evolution of HV SNe Ia is
correlated with not only the velocity at maximum light, but also the
light-curve decline rate, as is the case for normal-velocity (NV)
SNeIa. Spectral synthesis modeling shows that the outermost layer at
>17000km/s is well described by an O-Ne-C burning layer extending to
at least 25000km/s, and there is no unburnt carbon below 30000km/s;
these properties are largely consistent with the delayed detonation
scenario and are shared with the prototypical HV SN 2002bo despite the
large difference in Δm15(B). This structure is strikingly
different from that derived for the well-studied NV SN 2011fe. We
suggest that the relation between the mass of 56Ni (or Δm15)
and the extent of the O-Ne-C burning layer provides an important
constraint on the explosion mechanism(s) of HV and NV SNe.
Description:
We performed spectral observations of SN 2019ein using the Hiroshima
One-shot Wide-field Polarimeter (HOWPol; 4500-9200Å, R∼400 at
6000Å), mounted on the Kanata 1.5m telescope of Hiroshima
University, and the Kyoto Okayama Optical Low-dispersion Spectrograph
with an integral field unit (KOOLS-IFU; 4000-8900Å, R∼500) on the
3.8m Seimei telescope of Kyoto University. The data were taken under
the programs 19A-1-CN07, 19A-1-CN09, 19A-1-CT01, 19A-K-0003,
19A-K-0004, and 19A-K-0010.
We performed BVRI-band imaging observations using HOWPol installed on
the Nasmyth stage of the 1.5m Kanata telescope at the
Higashi-Hiroshima Observatory, Hiroshima University. UBVRI-band images
were also taken using the Multi-spectral Imager (MSI) installed on the
1.6m Pirka telescope. Additionally, g'RI-band imaging observations
were performed using a robotic observation system with the Multicolor
Imaging Telescopes for Survey and Monstrous Explosions (MITSuME) at
the Akeno Observatory (AO) and at the Ishigaki-jima Astronomical
Observatory (IAO).
We also performed JHKs-band imaging observations with the Hiroshima
Optical and Near-InfraRed camera (HONIR) attached to the 1.5m Kanata
telescope, and with the Nishi-harima Infrared Camera (NIC) installed
at the Cassegrain focus of the 2.0m Nayuta telescope at the
NishiHarima Astronomical Observatory.
Additionally, we downloaded the imaging data obtained by the Swift
Ultraviolet/Optical Telescope (UVOT) from the Swift Data Archive.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
13 53 29.13 +40 16 31.3 SN 2019ein = NAME ATLAS 19ieo
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 121 48 Log of optical observations of SN 2019ein
table3.dat 76 26 Log of NIR observations of SN 2019ein
table4.dat 89 14 Log of Swift/UVOT observations of SN 2019ein
table5.dat 52 13 Log of the spectroscopic observations of SN 2019ein
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
J/A+A/471/527 : Spectroscopy of SN 2005cf (Garavini+, 2007)
J/MNRAS/384/107 : VRIJHK photometry of SN 2002cv (Elias-Rosa+, 2008)
J/ApJ/699/L139 : Spectral parameters of SNe Ia (Wang+, 2009)
J/PASP/122/1 : BVRI light curves of SN 2007gi (Zhang+, 2010)
J/ApJ/742/89 : Relations between spectra & colors of SNe Ia (Foley+, 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/A+A/554/A27 : 2011fe spectrophotometric time series (Pereira+, 2013)
J/other/Sci/340.170 : Classifications of 188 SNe Ia (Wang+, 2013)
J/ApJ/826/144 : Follow-up observations of SNIa ASASSN-14lp (Shappee+, 2016)
J/ApJ/870/L1 : K2 obs. of type Ia supernova SN 2018oh (Dimitriadis+, 2019)
J/A+A/627/A174 : Early light curve of SN 2013gy (Holmbo+, 2019)
J/ApJ/870/13 : K2 LC alternative analysis of ASASSN-18bt (Shappee+, 2019)
J/ApJ/882/120 : CfA, CSP, BSP and LOSS spec. & phot. of SNe Ia (Wang+, 2019)
J/MNRAS/499/1424 : Properties of 407 SNe and their 394 hosts (Hakobyan+, 2020)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 yr Obs.Y [2019] Observation Date, Year
6- 7 I2 "month" Obs.M Observation Date, Month, numeric
9- 10 I2 d Obs.D Observation Date, Day
12- 18 F7.1 d MJD [58604.8/58668.5] Modified Julian Date
(JD-2400000.5)
20- 24 F5.1 d Phase [-13.4/50.3] Phase, relative to the epoch of
B-band maximum (MJD=58618.24)
26- 31 F6.3 mag Umag [13.6/14.31]? U band magnitude
33- 37 F5.3 mag e_Umag [0.09/0.5]? Uncertainty in Umag
39- 44 F6.3 mag Bmag [13.97/18.26]? B band magnitude
46- 50 F5.3 mag e_Bmag [0.013/0.11]? Uncertainty in Bmag
52- 57 F6.3 mag gmag [13.98/16.6]? g' band magnitude
59- 63 F5.3 mag e_gmag [0.003/0.07]? Uncertainty in gmag
65- 70 F6.3 mag Vmag [13.93/18.01]? V band magnitude
72- 76 F5.3 mag e_Vmag [0.012/0.2]? Uncertainty in Vmag
78- 83 F6.3 mag Rmag [14.05/17.62]? R band magnitude
85- 89 F5.3 mag e_Rmag [0.017/0.14]? Uncertainty in Rmag
91- 96 F6.3 mag Imag [14.08/17.9]? I band magnitude
98-102 F5.3 mag e_Imag [0.02/0.1]? Uncertainty in Imag
104-114 A11 --- Tel Telescope (G1)
116-121 A6 --- Inst Instrument (G2)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 yr Obs.Y [2019] Observation Date, Year
6- 7 I2 "month" Obs.M Observation Date, Month, numeric
9- 10 I2 d Obs.D Observation Date, Day
12- 18 F7.1 d MJD [58606.7/58658.6] Modified Julian Date
(JD-2400000.5)
20- 24 F5.1 d Phase [-11.5/40.4] Phase relative to the epoch of
B-band maximum (MJD=58618.24)
26- 31 F6.3 mag Jmag [14.45/16.32]? J band magnitude
33- 37 F5.3 mag e_Jmag [0.019/0.2]? Uncertainty in Jmag
39- 44 F6.3 mag Hmag [14.68/16.09]? H band magnitude
46- 50 F5.3 mag e_Hmag [0.03/0.5]? Uncertainty in Hmag
52- 57 F6.3 mag Ksmag [14.47/15.11]? Ks band magnitude
59- 63 F5.3 mag e_Ksmag [0.027/0.23]? Uncertainty in Ksmag
65- 70 A6 --- Tel Telescope (G1)
72- 76 A5 --- Inst Instrument (G2)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 yr Obs.Y [2019] Observation Date, Year
6- 7 I2 "month" Obs.M Observation Date, Month, numeric
9- 10 I2 d Obs.D Observation Date, Day
12- 18 F7.1 d MJD [58605.4/58630.2] Modified Julian Date
(JD-2400000.5)
20- 24 F5.1 d Phase [-12.8/12] Phase relative to the epoch of
B-band maximum (MJD=58618.24)
26- 31 F6.3 mag Vmag [13.89/17.63]? Swift/UVOT V band magnitude
33- 37 F5.3 mag e_Vmag [0.036/0.21]? Uncertainty in Vmag
39- 44 F6.3 mag Bmag [13.91/17.6]? Swift/UVOT B band magnitude
46- 50 F5.3 mag e_Bmag [0.026/0.07]? Uncertainty in Bmag
52- 57 F6.3 mag Umag [13.91/17.84]? Swift/UVOT U band magnitude
59- 63 F5.3 mag e_Umag [0.037/0.08]? Uncertainty in Umag
65- 70 F6.3 mag uvw1mag [15.63/20.8]? Swift/UVOT uvw1 band magnitude
72- 76 F5.3 mag e_uvw1mag [0.03/0.5]? Uncertainty in uvw1mag
78- 83 F6.3 mag uvw2mag [16.74/20.67]? Swift/UVOT uvw2 band magnitude
85- 89 F5.3 mag e_uvw2mag [0.03/0.5]? Uncertainty in uvw2mag
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 yr Obs.Y [2019] Observation Date, Year
6- 7 I2 "month" Obs.M Observation Date, Month, numeric
9- 10 I2 d Obs.D Observation Date, Day
12- 18 F7.1 d MJD [58606.7/58659.6] Modified Julian Date
(JD-2400000.5)
20- 24 F5.1 d Phase [-11.5/41.4] Phase relative to the epoch of
B-band maximum (MJD=58618.24)
26- 29 I4 0.1nm wmin [4000/4500] Spectral coverage, minimum, Angstroms
31- 34 I4 0.1nm wmax [8900/9200] Spectral coverage, maximum, Angstroms
36- 38 I3 --- Res [400/500] Spectral resolution, lambda/delta(lambda)
40- 45 A6 --- Tel Telescope (G1)
47- 52 A6 --- Inst Instrument (G2)
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Global notes:
Note (G1): Telescopes used as follows:
Kanata = Nasmyth stage of the 1.5-m Kanata telescope at the
Higashi-Hiroshima Observatory
MITSuME/AO = Multicolor Imaging Telescopes for Survey and Monstrous
Explosions at the Akeno Observatory
MITSuME/IAO = Multicolor Imaging Telescopes for Survey and Monstrous
Explosions at the Ishigaki-jima Astronomical Observatory
Pirika = 1.6-m Pirka telescope at the Higashi-Hiroshima Observatory
Nayuta = 2.0-m Nayuta telescope at the NishiHarima Astronomical
Observatory
Seimei = 3.8-m Seimei telescope, Kyoto University at the
Okayama Observatory;
Note (G2): Instruments used as follows:
HOWPol = Hiroshima One-shot Wide-field Polarimeter
HONIR = Hiroshima Optical and Near-InfraRed camera
MSI = Multi-spectral Imager
NIC = Nishi-harima Near Infrared Camera
KOOLS = Kyoto Okayama Optical Low-dispersion Spectrograph (w/IFU)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 06-Oct-2021