J/ApJ/949/75 ugriBV phot. & spectra of type II-P SN2019mhm (Vazquez+, 2023)
The type II-P supernova 2019mhm and constraints on its progenitor system.
Vazquez J., Kilpatrick C.D., Dimitriadis G., Foley R.J., Piro A.L.,
Rest A., Rojas-Bravo C.
<Astrophys. J., 949, 75 (2023)>
=2023ApJ...949...75V 2023ApJ...949...75V
ADC_Keywords: Supernovae; Photometry, ugriz; Spectra, optical
Keywords: Core-collapse supernovae
Abstract:
We present pre- and postexplosion observations of the Type II-P
supernova (SN II-P) 2019mhm located in NGC 6753. Based on optical
spectroscopy and photometry, we show that SN 2019mhm exhibits broad
lines of hydrogen with a velocity of -8500R±200km/s and a 111±2d
extended plateau in its luminosity, typical of the Type II-P subclass.
We also fit its late-time bolometric light curve and infer that it
initially produced a 56Ni mass of 1.3x10-2±5.5x10-4M☉.
Using imaging from the Wide Field Planetary Camera 2 on the Hubble
Space Telescope obtained 19yr before explosion, we aligned to a
postexplosion Wide Field Camera 3 image and demonstrate that there is
no detected counterpart to the SN to a limit of >24.53mag in F814W,
corresponding to an absolute magnitude limit of MF814W<-7.7mag.
Comparing to massive-star evolutionary tracks, we determine that the
progenitor star had a maximum zero-age main-sequence mass
<17.5M☉, consistent with other SN II-P progenitor stars. SN
2019mhm can be added to the growing population of SNe II-P with both
direct constraints on the brightness of their progenitor stars and
well-observed SN properties.
Description:
We obtained imaging of NGC 6753 from the HST Mikulski Archive for
Space Telescopes covering the site of SN 2019mhm. The data were taken
on 2000 June 22 20:26:14 using the Wide Field and Planetary Camera 2
(WFPC2) and on 2021 April 5 20:07:52 UT using the Wide Field Camera 3
(WFC3). WFPC2 observed for 320s in the F814W filter and 1900s in the
F300W filter (Proposal ID 8645; PI Windhorst). We observed with WFC3
for 780s in F814W and 710 seconds in F300X (Proposal ID 16239;
PI Foley). The specific observations analysed can be accessed via
doi:10.17909/ggct-aw51.
See Section 2.1.
We observed SN 2019mhm in the uBVgri bands with the Swope 1m optical
telescope at Las Campanas Observatory, Chile from 2019 August 2 to
2020 March 14.
SN 2019mhm was also observed in the bands by the Sinistro imagers on
the Las Cumbres Observatory (LCO) 1m telescope network from
2019 August 2 to 2020 March 2.
See Section 2.2.
We obtained a classification spectrum of SN 2019mhm for our spectral
analysis (as described in Chen+ 2019TNSCR1444....1C 2019TNSCR1444....1C). These data were
obtained at Las Campanas Observatory with the du Pont 2.5m telescope
and Wide field reimaging CCD (WFCCD) on 2019 August 3.
In addition, we analysed spectroscopy of SN 2019mhm obtained through
the LCO network at Siding Spring Observatory, Australia on the Faulkes
2m telescope and FLOYDS spectrograph from 2019 August 4.
See Section 2.3.
Objects:
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RA (ICRS) DE Designation(s)
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19 11 24.06 -57 03 17.9 SN 2019mhm = AT 2019mhm
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 37 218 Photometry of SN 2019mhm
sp/* . 2 Spectra of SN 2019mhm obtained with WFCCD and
FLOYDS-S (Data behind Figure 3)
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
VIII/89 : Northern HI Parkes All Sky Survey Catalogue (HIPASS) (Wong+, 2006)
J/MNRAS/433/1871 : UBVRI griz light curves of SN 2012aw (Bose+, 2013)
J/MNRAS/445/2677 : Peculiar velocities in 6dFGS (Springob+, 2014)
J/MNRAS/459/3939 : Type II supernova light curves (Valenti+, 2016)
J/MNRAS/461/2003 : SN 2013ej LCs 1 to 450d after explosion (Yuan+, 2016)
J/MNRAS/478/3138 : Cool supergiants in Magellanic Clouds (Davies+, 2018)
J/ApJ/885/43 : UBVRI & ugriz phot. of supernova SN 2017gmr (Andrews+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d MJD [58697.8/59309.9] Modified Julian Date of
observation (JD-2400000.5)
12- 16 A5 --- Filt Filter (B, V, u, g, r, i, F300X, or F814W)
18- 18 A1 --- l_omag Limit flag on omag
20- 25 F6.3 mag omag [16.53/27.21] Observed AB magnitude in Filt
27- 31 F5.3 mag e_omag [0.013/0.4]? Uncertainty in omag
33- 37 A5 --- Tel Source (1)
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Note (1): Source as follows:
HST = HST/WFPC2 and WFPC3 observations from MAST (2 occurrences)
LCO = Las Cumbres Observatory Sinistro imagers (75 occurrences)
Swope = Las Campanas Observatory Swope 1m observations (141 occurrences)
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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1- 17 F17.11 0.1nm lambda [3350/10100] Wavelength in Angstroms
19- 31 E13.6 cW/m2/nm Flux Flux density in erg/s/cm2/Å
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 16-Jul-2025