J/ApJ/931/32 Optical light curves of the superluminous SN2018lfe (Yin+, 2022)
Optical observations and modeling of the superluminous supernova 2018lfe.
Yin Y., Gomez S., Berger E., Hosseinzadeh G., Nicholl M., Blanchard P.K.
<Astrophys. J., 931, 32 (2022)>
=2022ApJ...931...32Y 2022ApJ...931...32Y
ADC_Keywords: Photometry, UBVRI; Supernovae
Keywords: Supernovae ; Core-collapse supernovae
Abstract:
We present optical imaging and spectroscopy of SN 2018lfe, which we
classify as a Type I superluminous supernova (SLSN-I) at a redshift of
z=0.3501±0.0004 with a peak absolute magnitude of Mr=-22.1±0.1mag,
one of the brightest SLSNe discovered. SN 2018lfe was identified for
follow-up using our FLEET machine-learning pipeline. Both the light
curve and the spectra of SN 2018lfe are consistent with the broad
population of SLSNe. We fit the light curve with a magnetar central
engine model and find an ejecta mass of Mej∼3.8M☉, a magnetar
spin period of P∼2.9ms, and a magnetic field strength of
B⊥∼2.8x1014G. The magnetic field strength is near the top of
the distribution for SLSNe, while the spin period and ejecta mass are
near the median values of the distribution for SLSNe. From late-time
imaging and spectroscopy we find that the host galaxy of SN 2018lfe
has an absolute magnitude of Mr=-17.85±0.24, (LB=0.029±0.007L*),
and an inferred metallicity of Z∼0.3Z☉ and star formation rate
of ∼0.8M☉/yr.
Description:
We obtained images of SN 2018lfe with the KeplerCam imager on the 1.2m
telescope at Fred Lawrence Whipple Observatory (FLWO) in the g, r, and
i bands, starting on 2019 January 11 (MJD=58494). SN 2018lfe was also
observed at several earlier epochs by ZTF in the g and r bands, for
which we obtained the raw images from the NASA/IPAC Infrared Science
Archive. The SN was also observed by the Pan-STARRS Survey for
Transients (PSST; Chambers+ 2019TNSTR...5....1C 2019TNSTR...5....1C) in the w and i bands,
and we obtained the photometry from the publicly available data on the
Open Supernova Catalog (Guillochon+ 2017ApJ...835...64G 2017ApJ...835...64G).
Objects:
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RA (ICRS) DE Designation(s)
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09 33 29.55 +00 03 08.3 SN 2018lfe = ZTF18acqyvag
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig1.dat 34 40 Optical light curve of SN2018lfe
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See also:
II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)
J/ApJ/830/13 : Host-galaxy NUV-NIR data of 32 superluminous SNe (Perley+, 2016)
J/A+A/675/A195 : ZTF DR11 classification in ZTF/4MOST sky (Sanchez-Saez+, 2023)
Byte-by-byte Description of file: fig1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [0/88] Sequential index of observation
4- 14 F11.5 d MJD [58434.5/58603.7] Modified Julian Date of
observation (JD-2400000.5)
16- 21 F6.3 mag omag [19.15/22.6] Observed magnitude in Filt
23- 27 F5.3 mag e_omag [0.05/0.6] Uncertainty in omag
29 A1 --- Filt Filter used (g, r, i or w)
31- 34 A4 --- Tel Source of photometry ("ZTF", "FLWO" or "PS1")
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 20-Mar-2024