J/A+A/692/A26 Optical Sloan magnitudes of SN 2018ivc (Reguitti+, 2024)
The fast rise of the unusual Type IIL/IIb SN 2018ivc.
Reguitti A., Pignata G., Maeda K., Moriya T.J., Kuncarayakti H.,
Rodriguez O., Bersten M., Anderson J.P., Charalampopoulos P., Fraser M.,
Gromadzki M., Young D.R., Benetti S., Cai Y.-Z., Elias-Rosa N.,
Lundqvist P., Carini R., Cosentino S.P., Galbany L., Gonzalez-Banuelos M.,
Gutierrez C.P., Kopsacheili M., Pineda Garcia J.A., Ramirez M.
<Astron. Astrophys. 692, A26 (2024)>
=2024A&A...692A..26R 2024A&A...692A..26R (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry, CCD ; Photometry, SDSS ; Optical ;
Infrared
Keywords: supernovae: general - supernovae: individual: SN 2018ivc -
galaxies: individual: M 77
Abstract:
We present an analysis of the photometric and spectroscopic dataset of
the Type II supernova (SN) 2018ivc in the nearby (10Mpc) galaxy
Messier 77. Thanks to the high cadence of the CHASE survey, we
observed the SN rising very rapidly by nearly three magnitudes in five
hours (or 18mag/d).
The r-band light curve presents four distinct phases: the maximum
light is reached in just one day, then a first, rapid linear decline
precedes a short-duration plateau. Finally, a long, slower linear
decline lasted for one year. Following a radio rebrightening, we
detected SN 2018ivc four years after the explosion.
The early spectra show a blue, nearly featureless continuum, but the
spectra evolve rapidly: after about 10 days a prominent Halpha line
starts to emerge, with a peculiar profile, but the spectra are heavily
contaminated by emission lines from the host galaxy. HeI lines,
namely 5876,7065, are also strong. On top of the former, a strong
absorption from the Na I doublet is visible, indicative of a
non-negligible internal reddening.
From its equivalent width, we derive a lower limit on the host
reddening of AV=1.5mag, while from the Balmer decrement and a match
of the B-V colour curve of SN 2018ivc to that of the comparison
objects, a host reddening of AV=3.0mag is obtained. The spectra are
similar to those of SNe II, but with strong He lines.
Given the peculiar light curve and spectral features, we suggest SN
2018ivc could be a transitional object between the Type IIL and Type
IIb SNe classes. In addition, we found signs of interaction with
circumstellar medium in the light curve, making SN 2018ivc also an
interacting event. Finally, we modelled the early multi-band light
curves and photospheric velocity of SN 2018ivc to estimate the
explosion and CSM physical parameters.
Description:
Photometric measurements of SN 2018ivc in the optical Johnson, Sloan,
Open filter, ATLAS orange and cyan, and Near Infrared are presented.
In each table date, MJD, measurements with relative errors and
instrument are given.
Objects:
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RA (2000) DE Designation(s)
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02 42 41.27 +00 00 31.9 SN 2018ivc = DLT 18aq
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 84 42 Magnitudes of SN 2018ivc in the Sloan ugriz filters
(sloan.dat)
tablec2.dat 73 60 Magnitudes of SN 2018ivc in Johnson BVRI filters
(johnson.dat)
tablec3.dat 39 40 Magnitudes of SN 2018ivc in the Clear filter
(clear.dat)
tablec4.dat 63 4 Magnitudes of SN 2018ivc in the NIR JHK filters
(nir.dat)
tablec5.dat 41 23 Magnitudes of SN 2018ivc in the ATLAS
orange and cyan filters (atlas.dat)
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Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Date Calendar Date
12- 19 F8.2 d MJD Modified Julian date
21- 25 F5.2 mag umag ?=99.99 u magnitude
27- 30 F4.2 mag e_umag ?=0 u magnitude error
32- 36 F5.2 mag gmag ?=99.99 g magnitude
38- 41 F4.2 mag e_gmag ?=0 g magnitude error
43 A1 --- l_rmag Limit flag on rmag
44- 48 F5.2 mag rmag ?=99.99 r magnitude
50- 53 F4.2 mag e_rmag ?=0 r magnitude error
55 A1 --- l_imag Limit flag on imag
56- 60 F5.2 mag imag ?=99.99 i magnitude
62- 65 F4.2 mag e_imag ?=0 i magnitude error
67- 71 F5.2 mag zmag ?=99.99 z magnitude
73- 76 F4.2 mag e_zmag ?=0 z magnitude error
78- 84 A7 --- Inst Instrument (1)
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Note (1): Instrument as follows:
SCHMIDT = 0.92-m Asiago Schmidt+Moravian
PROMPT = 0.4-m Prompt5+Apogee
ALFOSC = 2.56-m NOT+ALFOSC
IO:O = 2.0-m Liverpool+IO:O
CFHT = 3.58-m CFHT+MegaPrime
ZTF = 1.2-m S. Oschin Schmidt+ZTF survey MOSAIC
FORS = 8.2-m VLT+FORS2
EFOSC = 3.58-m NTT+EFOSC2
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Byte-by-byte Description of file: tablec2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Date Calendar Date
12- 19 F8.2 d MJD Modified Julian date
21- 25 F5.2 mag Bmag ?=99.99 B magnitude
27- 30 F4.2 mag e_Bmag ?=0 B magnitude error
32 A1 --- l_Vmag Limit flag on Vmag
33- 37 F5.2 mag Vmag ?=99.99 V magnitude
39- 42 F4.2 mag e_Vmag ?=0 V magnitude error
44- 48 F5.2 mag Rmag ?=99.99 R magnitude
50- 53 F4.2 mag e_Rmag ?=0 R magnitude error
55- 59 F5.2 mag Imag ?=99.99 I magnitude
61- 64 F4.2 mag e_Imag ?=0 I magnitude error
66- 74 A9 --- Inst Instrument (1)
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Note (1): Instrument as follows:
PROMPT5 = 0.4-m Prompt5+Apogee
PROMPT6 = 0.4-m Prompt6+Apogee
PROMPT8 = 0.6-m Prompt8+Apogee
SCHMIDT = 0.92-m Asiago Schmidt+Moravian
EFOSC = 3.58-m NTT+EFOSC2
TRAPPIST = 0.6-m TRAPPIST+Fairchild
ALFOSC = 2.56-m NOT+ALFOSC
ANDICAM = 1.3-m SMARTS+ANDICAM
SUBARU = 8.2-m SUBARU+FOCAS
WFI = 2.2-m MPG/ESO+WFI
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Byte-by-byte Description of file: tablec3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Date Calendar Date
12- 19 F8.2 d MJD Modified Julian date
21 A1 --- l_Clearmag Limit flag on Clearmag
22- 26 F5.2 mag Clearmag Clear magnitude
28- 31 F4.2 mag e_Clearmag Clear magnitude error
32- 40 A9 --- Inst Instrument (1)
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Note (1): Instruments as follows:
PROMPT = 0.4-m Prompt1+Apogee
Itagaki = https://www.rochesterastronomy.org/sn2018/sn2018ivc.html
Kanata = https://www.rochesterastronomy.org/sn2018/sn2018ivc.html
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Byte-by-byte Description of file: tablec4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Date Calendar Date
12- 19 F8.2 d MJD Modified Julian date
21- 25 F5.2 mag Jmag J magnitude
27- 30 F4.2 mag e_Jmag J magnitude error
32- 36 F5.2 mag Hmag H magnitude
38- 41 F4.2 mag e_Hmag H magnitude error
43- 47 F5.2 mag Kmag ?=99.99 K magnitude
49- 52 F4.2 mag e_Kmag ?=0 K magnitude error
54- 63 A10 --- Inst Instrument (1)
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Note (1): Instruments as follows:
ANDICAM-IR = 1.3-m La Silla
SOFI = 3.58-m La Silla (NTT)
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Byte-by-byte Description of file: tablec5.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Date Calendar Date
12- 19 F8.2 d MJD Modified Julian date
21- 25 F5.2 mag omag ?=99.99 orange magnitude
27- 30 F4.2 mag e_omag ?=0 orange magnitude error
32- 36 F5.2 mag cmag ?=99.99 cyan magnitude
38- 41 F4.2 mag e_cmag ?=0 cyan magnitude error
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Acknowledgements:
Andrea Reguitti, andrea.reguitti(at)gmail.com
(End) Andrea Reguitti [INAF-OABr, Italy], Patricia Vannier [CDS] 26-Sep-2024