J/ApJ/895/31 Photometric observations of Type II SN 2018ivc (Bostroem+, 2020)
Discovery and rapid follow-up observations of the unusual Type II SN 2018ivc in
NGC 1068.
Bostroem K.A., Valenti S., Sand D.J., Andrews J.E., Van Dyk S.D.,
Galbany L., Pooley D., Amaro R.C., Smith N., Yang S., Anupama G.C.,
Arcavi I., Baron E., Brown P.J., Burke J., Cartier R., Hiramatsu D.,
Dastidar R., Derkacy J.M., Dong Y., Egami E., Ertel S., Filippenko A.V.,
Fox O.D., Haislip J., Hosseinzadeh G., Howell D.A., Gangopadhyay A.,
Jha S.W., Kouprianov V., Kumar B., Lundquist M., Milisavljevic D.,
Mccully C., Milne P., Misra K., Reichart D.E., Sahu D.K., Sai H., Singh A.,
Smith P.S., Vinko J., Wang X., Wang Y., Wheeler J.C., Williams G.G.,
Wyatt S., Zhang J., Zhang X.
<Astrophys. J., 895, 31-31 (2020)>
=2020ApJ...895...31B 2020ApJ...895...31B (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae; Photometry, UBVRI
Keywords: Circumstellar gas; Core-collapse supernovae; Type II supernovae
Abstract:
We present the discovery and high-cadence follow-up observations of
SN2018ivc, an unusual SNeII that exploded in NGC1068 (D=10.1Mpc). The
light curve of SN2018ivc declines piecewise-linearly, changing slope
frequently, with four clear slope changes in the first 30days of
evolution. This rapidly changing light curve indicates that
interaction between the circumstellar material and ejecta plays a
significant role in the evolution. Circumstellar interaction is
further supported by a strong X-ray detection. The spectra are rapidly
evolving and dominated by hydrogen, helium, and calcium emission
lines. We identify a rare high-velocity emission-line feature
blueshifted at ∼7800km/s (in Hα, Hβ, Pβ, Pγ,
HeI, and CaII), which is visible from day 18 until at least day 78 and
could be evidence of an asymmetric progenitor or explosion. From the
overall similarity between SN2018ivc and SN1996al, the Hα
equivalent width of its parent HII region, and constraints from
pre-explosion archival Hubble Space Telescope images, we find that the
progenitor of SN2018ivc could be as massive as 52 M☉ but is more
likely <12M☉. SN2018ivc demonstrates the importance of the early
discovery and rapid follow-up observations of nearby supernovae to
study the physics and progenitors of these cosmic explosions.
Description:
The photometric and spectroscopic follow-up observations of SN2018ivc
were obtained and coordinated through Las Cumbres Observatory's Global
Supernova Project (GSP; PI:D.A.Howell).
We observed data from the 1.04m Sampurnanand Telescope in the BVRI
bands, the 1.3m Devasthal Fast Optical Telescope in the BVRI bands,
the 2.01m Himalayan Chandra Telescope (HCT) in the BVRI bands, the
Mont4K instrument on the 1.55m Kuiper Telescope in the UBV bands, and
the 0.6m Super-LOTIS telescope in the BVRI bands. Late-time optical
observations were obtained with Hubble Space Telescope (HST) on 2019
July 1 using the Wide Field Camera 3 (WFC3) UVIS channel (F555W and
F814W), as part of the ToO program GO-15151 (PI:S.Van Dyk). SN2018ivc
was also observed with the Neil Gehrels Swift Observatory.
The DLT40 survey identified SN2018ivc on 2018 November 24.07, 4.96
days after the last observation of the field on 2018 November 19.11.
Since 2017 December, DLT40 has operated two nearly identical 0.41m
telescopes, one at Cerro Tololo Inter-American Observatory (CTIO) in
Chile and the other at Meckering Observatory in Western Australia.
After the DLT40 team's prompt reporting of the SN to TNS, the Asteroid
Terrestrial-impact Last Alert System (ATLAS) identified a more recent
non-detection in their data on 2018 November 20.42 with a limiting
magnitude of 18.6mag in the orange-ATLAS filter.
Objects:
--------------------------------------------------
RA (2000) DE Designation(s)
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02 42 41.28 -00 00 31.9 SN 2018ivc = SN 2018ivc
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 74 526 Photometric observations of SN 2018ivc
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See also:
J/AZh/85/794 : UBVRHa photometry on 5 galaxies (Gusev+, 2008)
J/ApJ/729/143 : Photometry of type IIn SN 2008am (Chatzopoulos+, 2011)
J/ApJ/731/120 : Intrinsic SN Ia light curves (Mandel+, 2011)
J/ApJ/736/159 : Photometry monitoring of the SN PTF10vdl (Gal-Yam+, 2011)
J/ApJ/742/L18 : Follow-up photometry of the SN IIb PTF 11eon (Arcavi+, 2011)
J/ApJ/749/18 : Swift/UVOT observations of 12 nearby SN-Ia (Brown+, 2012)
J/ApJ/753/22 : Swift/UVOT observations of SN 2011fe (Brown+, 2012)
J/ApJ/781/42 : Optical photometry of SN 2010jl (Ofek+, 2014)
J/ApJ/787/29 : VOT photometry of Super-Chandrasekhar mass SNeIa (Brown+, 2014)
J/ApJ/789/104 : SNe IIn observations and properties (Ofek+, 2014)
J/ApJ/796/L18 : Type Ia supernova 2011de UVOT photometry (Brown, 2014)
J/ApJ/805/74 : SN2014J Swift/UVOT light curves (Brown+, 2015)
J/ApJ/813/30 : UV-Optical light curves of the SNIa iPTF14bdn (Smitka+, 2015)
J/ApJ/821/57 : Photometry of the Type Ib/c SN2013ge (Drout+, 2016)
J/ApJ/828/3 : Swift obs. of the superluminous SNI ASASSN-15lh (Brown+, 2016)
J/ApJ/836/25 : Swift UVOT light curves of ASASSN-15lh (Margutti+, 2017)
J/ApJ/836/232 : Swift-UVOT obs. analysis of 29 SNe Ia (Brown+, 2017)
J/ApJ/853/62 : Optical and NIR spectra and LCs of SN2016ija (Tartaglia+, 2018)
J/ApJ/860/100 : LCs of 26 hydrogen-poor superluminous SNe (De Cia+, 2018)
J/ApJ/882/L15 : SN 2018hna photometry & spectroscopy obs. (Singh+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 yr Obs.Y [2018/2019] Observation Date, UT
6- 7 I2 "month" Obs.M Observation Date, UT
9- 10 I2 d Obs.D Observation Date, UT
12- 13 I2 h Obs.h Observation Date, UT
15- 16 I2 min Obs.m Observation Date, UT
18- 22 F5.2 s Obs.s Observation Date, UT
24- 31 F8.2 d MJD [58435/58666] Modified Julian Date, JD-2400000.5
33- 38 F6.2 d Phase [-9.2/221] Phase, days since event
40- 56 A17 --- Inst Source/Telescope (1)
58- 62 A5 --- Filt Filter (2)
64- 64 A1 --- l_mag [<] Limit flag for mag
65- 69 F5.2 mag mag [14.2/20.4] Observed magnitude in Filter (2)
71- 74 F4.2 mag e_mag [0.01/1.6]? Uncertainty in mag (3)
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Note (1): Instruments as follows:
ATLAS = Asteroid Terrestrial-impact Last Alert System (2 occurrences)
CTIO-Prompt5 = Cerro Tololo Inter-American Observatory(74 occurrences)
DFOT = Devasthal Fast Optical Telescope (6 occurrences)
HCT = Himalayan Chandra Telescope (35 occurrences)
HST = Hubble Space Telescope (2 occurrences)
Kuiper = Kuiper Telescope (3 occurrences)
LCO COJ 1m = Las Cumbres Observatory COJ camera (10 occurrences)
LCO CPT 1m = Las Cumbres Observatory CPT camera (101 occurrences)
LCO ELP 1m = Las Cumbres Observatory ELP camera (43 occurrences)
LCO LSC 1m = Las Cumbres Observatory LSC camera (158 occurrences)
Meckering-Prompt5 = Meckering Observatory (54 occurrences)
SLOTIS = Super-LOTIS telescope (4 occurrences)
ST = Sampurnanand Telescope (12 occurrences)
Swift = Swift Observatory (13 occurrences)
ZTF = Zwicky Transient Facility (9 occurrences)
Note (2): The UVW1, UVW2, UVM2, U, B, and V filters are given in the Vega
magnitude system; the g, r, & i filters are given in the AB magnitude system
Note (3): The uncertainties are null values (blank) for upper limits.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 17-Sep-2021