J/A+A/710/A367 SN 2021lwz light curves (Poidevin+, 2026)
SN 2021lwz: Another exotic luminous and fast evolving optical stripped envelope
supernova?
Poidevin F., West S.L., Omand C.M.B., Koenyves-Toth R., Schulze S., Yan L.,
Kangas T., Perez-Fournon I., Geier S., Sollerman J., Pessi P.J.,
Gutierrez C.M., Chen T.-W., Hinds K-Ryan , Marques-Chaves R., Shirley R.,
Jimenez Angel C., Lunnan R., Perley D.A., Sarin N., Yao Y., Dekany R.,
Purdum J., Wold A., Laher R.R., Graham M.J., Kasliwal M.M., Jegou Du Laz T.
<Astron. Astrophys. 710, A367 (2026)>
=2026A&A...710A.367P 2026A&A...710A.367P (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry ; Optical ; Ultraviolet
Keywords: stars: magnetars - supernova: general -
supernova: Individual (SN 2021lwz - galaxies: dwarf
Abstract:
Current large-scale, high-cadence surveys, such as the Zwicky
Transient Facility (ZTF), provide detections of new and rare types of
transients and supernovae (SNe) whose physical origins are not well
understood.
We aim to investigate the nature of SN 2021lwz at a redshift z=0.065,
an over-luminous SN with an absolute magnitude of Mg~-20.1 AB that
falls in the lower range of superluminous supernovae (SLSNe)
luminosities and was discovered in a faint dwarf galaxy with an
absolute magnitude of Mg~-14.5 AB.
We studied SN 2021lwz using optical spectroscopy and photometry and by
imaging linear polarimetry obtained during several follow-up
campaigns. All the data were used to analyse and model the evolution
of the explosion. Comparisons with other SNe of well-known or rarer
types were investigated.
SN 2021lwz belongs to the rare class of rapidly evolving transients.
The bolometric light curve rises in about seven days to a peak
luminosity of about 5x1043erg/s, at a rate of 0.2mag/day close to
the peak. Spectroscopy modelling reveals more similarities with a
normal Type Ic-like SN than with an SLSN before peak, showing slightly
broadened lines after peak. Light curve modelling shows that the
Arnett model of the bolometric light curve using a radioactive source
(56 Ni) is not able to reasonably explain the light curve evolution. A
magnetar model seems more appropriate, suggesting that the explosion
of low ejecta mass (Mej∼0.24 solar mass) took place in a low-mass
(M∼106.66 solar mass) dwarf galaxy of specific star formation rate
about ten times larger than typical star-forming galaxies.
SN 2021lwz is an uncommon transient showing many similarities with
several classes of transients, including rare transients. It may be an
interesting example of how differences in ejecta mass and engine
parameters could produce a wide range of engine-driven
stripped-envelope SNe.
Description:
Photometry data obtained on SN 2021lwz using several optical filters.
Objects:
----------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------------
09 44 47.390 +34 42 44.21 SN 2021lwz = ZTF21abaiono
-------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablec1.dat 36 161 Photometry table
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablec1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.1 d MJD Modified Julian Date (days)
9- 13 F5.1 d Phase Phase, Rest frame relative to the
g-band maximum, MJD 59350.9
15- 19 A5 --- Filter Filter (1)
21- 25 F5.2 mag mag Asymptotic filter band magnitude (2)
27- 30 F4.2 mag e_mag Uncertainty on the magnitude
32- 36 A5 --- Tel Telescope
--------------------------------------------------------------------------------
Note (1): Filters are UVB, gri, co, UVM2 UVW1 UVW2,
sdssu sdssg sdssr sdssi sdssz.
Note (2): The photometry is reported on the AB system and is not corrected for
reddening. The photometry is also available on WISERePa (Yaron & Gal-Yam
2012 - see https://www.wiserep.org/object/18321). Multiple exposures on any
given night are averaged to give the values presented here.
--------------------------------------------------------------------------------
Acknowledgements:
Frederick Poidevin, frederick.poidevin(at)iac.es
License: CC-BY-4.0
(End) Patricia Vannier [CDS] 04-Jun-2026