J/A+A/710/A221 SN 2021bnw optical light curves (Fiore+, 2026)
The nearby He-rich superluminous supernova SN 2021bnw at photospheric phases.
Fiore A., Kozyreva A., Yan L., Benetti S., Anderson J.P., Baklanov P.,
Cai Y.-Z., Cappellaro E., Chen T.-W., Elias-Rosa N., Gal-Yam A.,
Graham M.J., Gromadzki M., Groom S.L., Gutierrez C.P., Hiramatsu D.,
Howell D.A., Inserra C., Kasliwal M.M., Konyves-Toth R., Lundqvist P.,
McCully C., Mironov A., Moran S., Muller-Bravo T.E., Newsome M., Nicholl M.,
Ochner P., Padilla Gonzalez E., Pessi P.J., Pignata G., Ragosta F.,
Reguitti A., Reynolds T.M., Riddle R.L., Rusholme B., Salmaso I.,
Schulze S., Sollerman J., Tomasella L., Warshofsky D., Yang S., Young D.R.
<Astron. Astrophys. 710, A221 (2026)>
=2026A&A...710A.221F 2026A&A...710A.221F (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry ; Optical
Keywords: circumstellar matter - supernovae: general -
supernovae: individual: SN 2021bnw
Abstract:
We present and interpret the data of the nearby hydrogen-deficient but
helium-rich superluminous supernova SN 2021bnw which reached a
magnitude of -20.7 at maximum luminosity in g band.
We discuss the light curves and spectra of SN 2021bnw based on its
spectro-photometric follow-up, exploiting different observational
facilities. We reproduced the near-IR spectrum of SN 2021bnw with
TARDIS to inspect the chemical composition at late photospheric phases
and identify helium features. We also used a STELLA model coupling
hydrodynamics and radiation transport to constrain the physical
parameters of the explosion assuming a 56Ni+CSM scenario.
We suggest that SN 2021bnw was mainly powered by the interaction of
the ejecta with a previously lost He-rich circumstellar material,
coupled with a central power source.
This work expands the data sample of He-rich superluminous supernovae
(SLSNe Ib), and for a single-progenitor scenario, it can constrain the
masses and physics of their progenitors.
Description:
Multi-band photometric data for SN 2021bnw. All magnitudes are in the
specified system (AB or Vega) and are not corrected for extinction.
Objects:
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RA (2000) DE Designation(s)
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10 53 52.18 +12 33 29.12 SN 2021bnw = ZTF21aagpymw
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 138 228 Optical light curves
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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3- 10 F8.2 d MJD Modified Julian Date
12 A1 --- l_umag [<] Limit flag on u band
16- 20 F5.2 mag umag ? Magnitude in u band (AB)
24- 27 F4.2 mag e_umag ? Error on u magnitude
29 A1 --- l_Bmag [<] Limit flag on B band
33- 37 F5.2 mag Bmag ? Magnitude in B band (Vega)
41- 44 F4.2 mag e_Bmag ? Error on B magnitude
46 A1 --- l_gmag [<] Limit flag on g band
49- 54 F6.2 mag gmag ? Magnitude in g band (AB)
58- 61 F4.2 mag e_gmag ? Error on g magnitude
63 A1 --- l_Vmag [<] Limit flag on V band
67- 71 F5.2 mag Vmag ? Magnitude in V band (Vega)
75- 78 F4.2 mag e_Vmag ? Error on V magnitude
80 A1 --- l_rmag [<] Limit flag on r band
84- 88 F5.2 mag rmag ? Magnitude in r band (AB)
92- 95 F4.2 mag e_rmag ? Error on r magnitude
97 A1 --- l_imag [<] Limit flag on i band
101-105 F5.2 mag imag ? Magnitude in i band (AB)
109-112 F4.2 mag e_imag ? Error on i magnitude
116-120 F5.2 [10-7W] logL ? Bolometric luminosity (1)
124-127 F4.2 [10-7W] e_logL ? Error on bolometric luminosity (1)
131-138 A8 --- Inst Instrument identifier
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Note (1): Luminosity is expressed as log10(L [erg/s]).
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Acknowledgements:
Achille Fiore, achille.fiore(at)inaf.it
License: CC-BY-4.0 [see https://spdx.org/licenses/]
(End) Patricia Vannier [CDS] 20-Apr-2026