J/ApJ/872/135 Follow-up obs. of the type IIn SN KISS15s (Kokubo+, 2019)
A long-duration luminous type IIn supernova KISS15s: strong recombination lines
from the inhomogeneous ejecta-CSM interaction region and hot dust emission from
newly formed dust.
Kokubo M., Mitsuda K., Morokuma T., Tominaga N., Tanaka M., Moriya T.J.,
Yoachim P., Ivezic Z., Sako S., Doi M.
<Astrophys. J., 872, 135 (2019)>
=2019ApJ...872..135K 2019ApJ...872..135K
ADC_Keywords: Photometry, ugriz; Photometry, infrared; Supernovae
Keywords: circumstellar matter ; stars: mass-loss ; supernovae: general ;
supernovae: individual (KISS15s, 1988Z)
Abstract:
We report the discovery of an SN 1988Z-like type IIn supernova KISS15s
found in a low-mass star-forming galaxy at redshift z=0.038 during the
course of the Kiso Supernova Survey (KISS). KISS15s shows
long-duration optical continuum and emission line light curves,
indicating that KISS15s is powered by a continuous interaction between
the expanding ejecta and dense circumstellar medium (CSM). The
Hα emission line profile can be decomposed into four Gaussians
of narrow, intermediate, blueshifted intermediate, and broad velocity
width components, with a full width at half maximum of ≲100, ∼2000,
and ∼14000km/s for the narrow, intermediate, and broad components,
respectively. The presence of the blueshifted intermediate component,
of which the line-of-sight velocity relative to the systemic velocity
is about -5000km/s, suggests that the ejecta-CSM interaction region
has an inhomogeneous morphology and anisotropic expansion velocity. We
found that KISS15s shows increasing infrared continuum emission, which
can be interpreted as hot dust thermal emission of T∼1200K from newly
formed dust in a cool, dense shell in the ejecta-CSM interaction
region. The progenitor mass-loss rate, inferred from bolometric
luminosity, is dM/dt∼0.4M☉/yr (νw/40km/s), where νw is
the progenitor's stellar wind velocity. This implies that the
progenitor of KISS15s was a red supergiant star or a luminous blue
variable that had experienced a large mass loss in the centuries
before the explosion.
Description:
The optical-IR broadband photometric observations (spanning 2015 to
2017) for KISS15s include optical data from Kiso/Kiso Wide Field
Camera (KWFC), SkyMapper automated 1.3m telescope at Siding Spring
Observatory in Australia, Panoramic Survey Telescope and Rapid
Response System (Pan-STARRS), Mayall/Kitt Peak Ohio State Multi-Object
Spectrograph (KOSMOS), and Blanco/DECam, and IR data from WISE/NEOWISE
and Nayuta/Near infrared camera (NIC); see Section 2.1 for further
details.
KISS15s was discovered on 2015 September 18.78 UT (MJD=57283.78) as a
g∼19.6mag transient (Figure 1) during the Kiso Supernova Survey (KISS;
Morokuma+ 2014PASJ...66..114M 2014PASJ...66..114M), using the 1.05m Kiso Schmidt Telescope
located at Kiso Observatory in Japan.
Following the Kiso/KWFC discovery of KISS15s, we also carried out
optical spectroscopy measurements for rapid classification of the
transient on 2015 September 19.7 UT (MJD=57284.7) with the 2.0m Nayuta
telescope, using the Line Imager and Split Spectrograph (LISS), an
optical spectrograph; see Section 2.2.1.
At later epochs, we obtained three low-resolution spectra and two
high-resolution spectra for KISS15s using the Dual Imaging
Spectrograph (DIS) mounted on the ARC3.5 meter telescope at the Apache
Point Observatory (APO); see section 2.2.2.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
03 08 31.64 -00 50 05.6 KISS15s = NAME KISS15s
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
photom.dat 48 70 Optical and NIR photometry of KISS15s (Tables 1-7)
fig6.dat 59 8776 Nayuta/LISS and ARC3.5-m/DIS low-resolution spectra
of KISS15s
fig7.dat 59 5680 ARC3.5-m/DIS high-resolution spectra of KISS15s
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
II/358 : SkyMapper Southern Sky Survey. DR1.1 (Wolf+, 2018)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/MNRAS/394/21 : Multi-epoch spectroscopy of SN 1994W (Dessart+, 2009)
J/MNRAS/412/1441 : SNe luminosity functions (Li+, 2011)
J/ApJ/756/173 : Type IIn SNe 2005ip & 2006jd photometry (Stritzinger+, 2012)
J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)
J/A+A/555/A10 : Light curves of 5 type IIn supernovae (Taddia+, 2013)
J/ApJ/794/120 : Sloan Digital Sky Survey coadd. Stripe 82 (Annis+, 2014)
J/ApJ/787/163 : Photometric data for SN 2009ip (Graham+, 2014)
J/ApJ/792/30 : NEOWISE magnitudes for near-Earth objects (Mainzer+, 2014)
J/ApJ/781/42 : Optical photometry of SN 2010jl (Ofek+, 2014)
J/MNRAS/449/1876 : Photometric observations of SN PTF11iqb (Smith+, 2015)
J/A+A/580/A131 : Circumstellar-interacting supernovae (Taddia+, 2015)
Byte-by-byte Description of file: photom.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Inst Instrument designation (1)
11- 20 F10.4 d MJD [57234.7/58108.9] Modified Julian Date
22- 25 I4 yr Obs.Y [2015/2017] Year of the observation
27- 28 I2 "month" Obs.M Month of the observation
30- 31 I2 d Obs.D Day of the observation
32 A1 --- --- [- ]
33- 34 I2 d Day2 ? Second day of observation if any
36- 40 F5.2 mag mag [16.9/22.7] Apparent magnitude in band;
uncorrected for Galactic extinction
42- 45 F4.2 mag e_mag [0.01/0.4] Error in mag
47- 48 A2 --- Band Bandpass of the observation (g, r, i, z, w;
W1, W2 or H, J, Ks)
--------------------------------------------------------------------------------
Note (1): Instrument code as follows:
KWFC = The 1.05m Kiso Schmidt Telescope located at Kiso Observatory in
Japan with the Kiso Wide Field Camera (KWFC)
(33 occurrences; see Section 2.1.1).
SkyMapper = >3σ detection from the fully automated SkyMapper 1.3m
optical telescope at Siding Spring Observatory in Australia
(6 occurrences; see Section 2.1.2).
PanSTARRS = Pan-STARRS 3π Survey detected KISS15s as of 2015 August 30
(referred to as PS15bva in the Pan-STARRS Survey for Transients
database). We retrieved Pan-STARRS photometry data of KISS15s
directly from the Open Supernova Catalog
(Guillochon+ 2017ApJ...835...64G 2017ApJ...835...64G
-- 12 occurrences; see Section 2.1.3).
KOSMOS = The Mayall 4m Telescope in the Kitt Peak Ohio State Multi-Object
Spectrograph (KOSMOS) imaging mode (3 occurrences;
see Section 2.1.4).
DECam = Blanco 4m/DECam at Cerro Tololo Inter-American Observatory;
images from the DECam Legacy Survey (DECaLS DR7;
Dey+ 2019AJ....157..168D 2019AJ....157..168D
-- 3 occurrences; see Section 2.1.5).
NEOWISE = The NEOWISE 2018 Data Release, which includes all W1 (3.4um) and
W2 (4.6um) band images and associated photometry catalogs
acquired before the end of 2017
(10 occurrences; see Section 2.1.6).
NIC = The Nayuta telescope with the Nishi-Harima infrared camera (NIC)
GALFIT modeling photometry
(3 occurrences; see Section 2.1.7).
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Byte-by-byte Description of file: fig[67].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 21 A21 --- Inst Telescope/Instrument description
23- 32 A10 "date" Date Observation date
34- 43 F10.4 0.1nm lambda [3802.3/10359.6] Wavelength in the
observed-frame; in Angstrom units
45- 52 F8.4 10-17cW/m2/nm Flux [-77.2/62] Flux
in 10-17erg/cm2/s/Å units;
corrected for Galactic extinction
54- 59 F6.4 10-17cW/m2/nm e_Flux [0.2/3.7] Error in Flux
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 05-Aug-2020