J/A+A/710/A221ivo://CDS.VizieR/J/A+A/710/A221CDSFiore 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.2026-06-22T07:57:20Z2026-06-22T08:51:26ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsupernovaephotometryvisible-astronomyWe 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.2026A&A...710A.221Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/710/A221CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/710/A221https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/710/A221http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/710/A221https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/710/A221https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/710/A221http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/710/A221GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap3.322582951404819e-19 4.920466254354166e-19OpticaldefaultJ/A+A/710/A221/tableb1Optical light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintgmag? Magnitude in g band (AB)magphot.mag;em.opt.Bfloatnullablee_gmag? Error on g magnitudemagstat.error;phot.magfloatnullablel_Vmag[<] Limit flag on V bandmeta.code.errorcharVmag? Magnitude in V band (Vega)magphot.mag;em.opt.Vfloatnullablee_Vmag? Error on V magnitudemagstat.error;phot.magfloatnullablel_rmag[<] Limit flag on r bandmeta.code.errorcharrmag? Magnitude in r band (AB)magphot.mag;em.opt.Rfloatnullablee_rmag? Error on r magnitudemagstat.error;phot.magfloatnullablel_imag[<] Limit flag on i bandmeta.code.errorcharimag? Magnitude in i band (AB)magphot.mag;em.opt.IfloatnullableMJDModified Julian Datedtime.epochdoubleumag? Magnitude in u band (AB)magphot.mag;em.opt.Ufloatnullablee_umag? Error on u magnitudemagstat.error;phot.magfloatnullablel_Bmag[<] Limit flag on B bandmeta.code.errorcharBmag? Magnitude in B band (Vega)magphot.mag;em.opt.Bfloatnullablee_Bmag? Error on B magnitudemagstat.error;phot.magfloatnullablel_gmag[<] Limit flag on g bandmeta.code.errorchare_imag? Error on i magnitudemagstat.error;phot.magfloatnullablelogL? Bolometric luminosity (1)log(1e-07W)phys.luminosityfloatnullablee_logL? Error on bolometric luminosity (1)log(1e-07W)stat.errorfloatnullableInstInstrument identifiermeta.id;instrcharl_umag[<] Limit flag on u bandmeta.code.errorchar