J/ApJ/861/63 Type IIP SN 2016bkv LCs and spectra (Hosseinzadeh+, 2018)
Short-lived circumstellar interaction in the low-luminosity type IIP SN2016bkv.
Hosseinzadeh G., Valenti S., McCully C., Howell D.A., Arcavi I.,
Jerkstrand A., Guevel D., Tartaglia L., Rui L., Mo J., Wang X., Huang F.,
Song H., Zhang T., Itagaki K.
<Astrophys. J., 861, 63 (2018)>
=2018ApJ...861...63H 2018ApJ...861...63H
ADC_Keywords: Supernovae; Photometry, UBVRI; Spectra, optical
Keywords: supernovae: general ; supernovae: individual (SN 2016bkv)
Abstract:
While interaction with circumstellar material is known to play an
important role in Type IIn supernovae (SNe), analyses of the more
common SNe IIP and IIL have not traditionally included interaction as
a significant power source. However, recent campaigns to observe SNe
within days of explosion have revealed narrow emission lines of
high-ionization species in the earliest spectra of luminous SNe II of
all subclasses. These "flash ionization" features indicate the
presence of a confined shell of material around the progenitor star.
Here we present the first low-luminosity (LL) SN to show flash
ionization features, SN 2016bkv. This SN peaked at MV = -16 mag and
has Hα expansion velocities under 1350 km s-1 around maximum
light, placing it at the faint/slow end of the distribution of SNe IIP
(similar to SN 2005cs). The light-curve shape of SN 2016bkv is also
extreme among SNe IIP. A very strong initial peak could indicate
additional luminosity from circumstellar interaction. A very small
fall from the plateau to the nickel tail indicates unusually large
production of radioactive nickel compared to other LL SNe IIP. A
comparison between nebular spectra of SN 2016bkv and models raises the
possibility that SN 2016bkv is an electron-capture supernova.
Description:
In addition to unfiltered photometry from the 35 and 60cm telescopes
at the Itagaki Astronomical Observatory (Yamagata, Japan), we obtained
UBVgri photometry of SN 2016bkv using Las Cumbres Observatory's
robotic 1m telescope located at the McDonald Observatory (TX, USA) and
UBVRI photometry using the 0.8m Tsinghua University-National
Astronomical Observatory of China Telescope (TNT) located at the
Xinglong Observatory (Hebei Province, China).
We obtained 17 optical spectra of SN 2016bkv during the flash
ionization (Figure 2) and photospheric (Figure 3) phases using the
robotic FLOYDS instrument, mounted on Las Cumbres Observatory's 2m
telescope on Haleakala (HI, USA), and the Beijing Faint Object
Spectrograph and Camera (BFOSC) and the Optomechanics Research Inc.
(OMR) low-resolution spectrograph, both mounted on the 2.16m telescope
at Xinglong. Four additional spectra were obtained during the nebular
phase using the Kast Double Spectrograph on the C. Donald Shane
Telescope at the Lick Observatory (CA, USA) and the Low-Resolution
Imaging Spectrometer (LRIS) on the Keck I telescope at the W. M. Keck
Observatory (HI, USA).
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
10 18 19.31 +41 25 39.3 SN 2016bkv = SN 2016bkv
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 68 21 Log of spectroscopic observations
fig1.dat 34 758 One year of photometry of SN 2016bkv
sp/* . 22 Optical spectra in FITS format
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See also:
II/183 : UBVRI Photometric Standards (Landolt 1992)
II/282 : The SDSS Photometric Catalog, Release 6 (Adelman-McCarthy+, 2007)
J/ApJ/736/159 : Photometry monitoring of the SN PTF10vdl (Gal-Yam+, 2011)
J/MNRAS/442/844 : BVRI light curves of type II-P supernovae (Faran+, 2014)
J/MNRAS/459/3939 : Type II supernova light curves (Valenti+, 2016)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.1 d MJD [57470.5/58075.6] Modified Julian Date of
observation
9- 22 A14 --- Tel Telescope
24- 29 A6 --- Inst Instrument
31- 35 F5.1 d Phase [3/606.9] Phase
37- 68 A32 --- File File name in subdirectory sp/ --
column added by CDS
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Byte-by-byte Description of file: fig1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.3 d MJD [57468.7/57918.2] Modified Julian Date of
observation
11 A1 --- Filt [0UBVRIgri] Filter used
(0: unfiltered KAF-1001E CCD)
13- 17 F5.2 mag mag [13.3/24.3] Apparent magnitude in Filt
19- 22 F4.2 mag e_mag [0.01/8.4] Uncertainty in mag
24- 34 A11 --- Obs Observatory code for mag (1)
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Note (1): Instrument code as follows:
Itagaki = the 35 and 60cm telescopes at Itagaki Astronomical
Observatory (Yamagata, Japan) -- 6 occurrences;
Las_Cumbres = Las Cumbres Observatory's robotic 1m telescope located
at the McDonald Observatory (TX, USA) -- 583 occurrences;
TNT = the 0.8m Tsinghua University-National Astronomical Observatory
of China Telescope located at Xinglong Observatory
(Hebei Province, China) -- 169 occurrences.
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History:
From electronic version of the journal for table 1 and Figure 1 data.
From the Weizmann Interactive Supernova Data Repository (WISeREP) for
the spectra: http://wiserep.weizmann.ac.il/
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 12-Jul-2019