J/other/Nat/617.ivo://CDS.VizieR/J/other/Nat/617.477CDSKool E.C.Johansson J.Sollerman J.Moldon J.Moriya T.J.Mattila S.,Schulze S.Chomiuk L.Perez-Torres M.Harris C.Lundqvist P.Graham M.,Yang S.Perley D.A.Linn Strotjohann N.Fremling C.Gal-Yam A.,Lezmy J.Maguire K.Omand C.Smith M.Andreoni I.Bellm E.C.,Bloom J.S.De K.Groom S.L.Kasliwal M.M.Masci F.J.Medford M.S.,Park S.Purdum J.Reynolds T.M.Riddle R.Robert E.Ryder S.D.,Sharma Y.Stern D.2023-10-03T13:07:59Z2023-07-07T14:06:50ZCDS support team

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

cds-question@unistra.frsupernovaevisible-astronomysloan-photometryType Ia supernovae (SNe Ia) are thermonuclear explosions of degenerate white dwarf stars destabilized by mass accretion from a companion star, but the nature of their progenitors remains poorly understood. A way to discriminate between progenitor systems is through radio observations; a non-degenerate companion star is expected to lose material through winds or binary interaction before explosion, and the supernova ejecta crashing into this nearby circumstellar material should result in radio synchrotron emission. However, despite extensive efforts, no type Ia supernova (SN Ia) has ever been detected at radio wavelengths, which suggests a clean environment and a companion star that is itself a degenerate white dwarf star. Here we report on the study of SN 2020eyj, a SN Ia showing helium-rich circumstellar material, as demonstrated by its spectral features, infrared emission and, for the first time in a SN Ia to our knowledge, a radio counterpart. On the basis of our modelling, we conclude that the circumstellar material probably originates from a single-degenerate binary system in which a white dwarf accretes material from a helium donor star, an often proposed formation channel for SNe Ia. We describe how comprehensive radio follow-up of SN 2020eyj-like SNe Ia can improve the constraints on their progenitor systems.2023Natur.617..477Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/Nat/617.477CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/Nat/617.477https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/Nat/617.477http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/Nat/617.477https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/Nat/617.477https://vizier.iucaa.in/viz-bin/votable?-source=J/other/Nat/617.477http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/Nat/617.477GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/other/Nat/617.477/tables1Optical photometry of SN 2020eyj from the ZTFrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian datedtime.epochdoubleFilt[griz] Filtermeta.id;instr.filtercharPhasePhase is relative to the first detection epoch (58915.212), in rest-frame daysdtime;arith.difffloatmag? Magnitude in Filtermagphot.magfloatnullablee_mag? Magnitude in Filter errormagstat.error;phot.magfloatnullablelmag? Limit magnitudemagphot.magfloatnullableInstInstrumentmeta.id;instrchar