J/ApJ/882/L15 SN 2018hna photometry & spectroscopy obs. (Singh+, 2019)
SN 2018hna: 1987A-like supernova with a signature of shock breakout.
Singh A., Sahu D.K., Anupama G.C., Kumar B., Kumar H., Yamanaka M.,
Baklanov P.V., Tominaga N., Blinnikov S.I., Maeda K., Dutta A., Bhalerao V.,
Anche R.M., Barway S., Akitaya H., Nakaoka T., Kawabata M., Kawabata K.S.,
Sasada M., Takagi K., Maehara H., Isogai K., Kino M., Taguchi K., Nagao T.
<Astrophys. J. , 882, L15 (2019)>
=2019ApJ...882L..15S 2019ApJ...882L..15S
ADC_Keywords: Supernovae; Photometry, ultraviolet; Photometry, UBVRI
Keywords: Supernovae ; Core-collapse supernovae ; Type II supernovae
Abstract:
High-cadence ultraviolet, optical, and near-infrared photometric and
low-resolution spectroscopic observations of the peculiar Type II
supernova (SN) 2018hna are presented. The early-phase multiband light
curves (LCs) exhibit the adiabatic cooling envelope emission following
the shock breakout up to ∼14 days from the explosion. SN 2018hna has a
rise time of ∼88 days in the V band, similar to SN 1987A. A 56Ni
mass of ∼0.087±0.004M☉ is inferred for SN 2018hna from its
bolometric LC. Hydrodynamical modeling of the cooling phase suggests a
progenitor with a radius ∼50R☉, a mass of ∼14-20M☉, and an
explosion energy of ∼1.7-2.9x1051erg. The smaller inferred radius of
the progenitor than a standard red supergiant is indicative of a blue
supergiant progenitor of SN 2018hna. A subsolar metallicity
(∼0.3Z☉) is inferred for the host galaxy UGC 07534, concurrent
with the low-metallicity environments of 1987A-like events.
Description:
Optical photometric (UBVRI) and spectroscopic observations of
SN2018hna using the 2m Himalayan Chandra Telescope (HCT), Indian
Astronomical Observatory (IAO), Hanle, India began on 2018 October
31.9 UT (JD 2458423.4). The recently installed robotic 0.7m
GROWTH-India telescope (GIT) at IAO followed up SN 2018hna in the SDSS
g'r'i' filters starting 2018 November 15.9 UT. SN 2018hna was also
monitored with the 1.5m Kanata Telescope (KT) in the optical and the
near-infrared using the HOWPol and the Hiroshima Optical and
Near-InfraRed camera (HONIR). A few spectra were also obtained using
the Kyoto Okayama Optical Low-dispersion Spectrograph with
Optical-Fiber Integral Field Unit (KOOLS-IFU) mounted on the 3.8m
Seimei telescope, at the Okayama Observatory.
The Neil Gehrels Swift Observatory monitored SN 2018hna with the
ultraviolet Optical Telescope (UVOT) beginning 2018 October 23.6 UT.
Objects:
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RA (ICRS) DE Designation(s)
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12 26 12.07 +58 18 50.8 SN 2018hna = ZTF18acbwaxk
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
phot.dat 53 626 Data behind Figure 1 --
Photometric observations of SN 2018hna
spec.dat 10 27 List of Himalayan Chandra Telescope (HCT) HFOSC
observation dates (Table added by CDS)
sp/* . 27 Individual HCT-HFOSC spectra in ASCII format
for 27 observation dates
between 2018-10-31 and 2019-07-02
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/MNRAS/394/2266 : SN 2005cs one-year photometry (Pastorello+, 2009)
J/A+A/537/A141 : UBVRI light curves of SN 2009E (Pastorello+, 2012)
J/AJ/145/101 : Updated nearby galaxy catalog (Karachentsev+, 2013)
J/MNRAS/431/308 : SN 2011fu BVRI light curves (Kumar+, 2013)
J/ApJ/763/42 : X-ray emission from 28 SNe (IIn, Ibn or SLSN-I) (Ofek+, 2013)
Byte-by-byte Description of file: phot.dat
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Bytes Format Units Label Explanations
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1- 10 F10.2 d JD Julian Day
12- 17 F6.2 d Phase [3.8/256.9] Days since explosion; JD-2458411.3
19- 22 A4 --- Filt Name of the Filter used
24- 28 F5.2 mag mag [12.89/19.87] Magnitude, Vega System
30- 33 F4.2 mag e_mag [0/0.7] 1-sigma error
35- 46 A12 --- Tel Observing telescope (1)
48- 53 A6 --- Inst Instrument used
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Note (1): Telescope as follows:
1.5m KT = The 1.5m Kanata Telescope (KT) using the HOWPol or
the Hiroshima Optical and Near-InfraRed camera (HONIR)
(181 occurrences)
2m HCT = The 2m Himalayan Chandra Telescope (HCT), Indian Astronomical
Observatory (IAO), Hanle, India (162 occurrences)
GROWTH-India = The robotic 0.7m GROWTH-India telescope (GIT) at IAO
(188 occurrences)
Swift = The Neil Gehrels Swift Observatory with UVOT (95 occurrences)
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Byte-by-byte Description of file: spec.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Date Date of observation (UT)
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.8 0.1nm Lambda [3491.59/9125.44] Wavelength,
redshift-corrected in Angstrom units
15- 37 E23.15 10-17W/m2/nm Flux [-6.3e-15/2.9e-14]? Calibrated flux
in erg/s/cm2/Å units
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 15-Feb-2021