Srivastav, ShubhamSmartt, S.J.Huber, M.E.Chambers, K.C.Angus, C.R.Chen, T.-W.Callan, F.P.Gillanders, J.H.McBrien, O.R.Sim, S.A.Fulton, M.Hjorth, J.Smith, K.W.Young, D.R.Auchettl, K.Anderson, J.P.Pignata, G.De Boer, T.J.L.Lin, C.-C.Magnier, E.A.2024-07-122024-07-122022-04-01Monthly Notices of the Royal Astronomical Society, Volume 511, Issue 2, Pages 2708 - 2731, 1 April 20220035-8711https://repositorio.unab.cl/handle/ria/58432Indexación: Scopus.We present multiwavelength follow-up observations of the ATLAS discovered faint Iax supernova SN 2020kyg that peaked at an absolute magnitude of Mg ≈-14.9 ± 0.2, making it another member of the faint Iax supernova population. The bolometric light curve requires only ≈7 × 10-3 M· of radioactive 56Ni, with an ejected mass of Mej ∼0.4 M· and a low kinetic energy of E ≈ 0.05 ± 0.02 × 1051 erg. We construct a homogeneous volume-limited sample of 902 transients observed by ATLAS within 100 Mpc during a 3.5 yr span. Using this sample, we constrain the rates of faint Iax (Mr ≳-16) events within 60 Mpc at 12+14-8 per cent of the SN Ia rate. The overall Iax rate, at 15+17-9 per cent of the Ia rate, is dominated by the low-luminosity events, with luminous SNe Iax (Mr ≲-17.5) like 2002cx and 2005hk, accounting for only 0.9+1.1-0.5 per cent of the Ia rate (a 2σ upper limit of approximately 3 per cent). We favour the hybrid CONe WD + He star progenitor channel involving a failed deflagration of a near Chandrasekhar mass white dwarf, expected to leave a bound remnant and a surviving secondary companion, as a candidate explanation for faint Iax explosions. This scenario requires short delay times, consistent with the observed environments of SNe Iax. Furthermore, binary population synthesis calculations have suggested rates of 1-18 per cent of the SN Ia rate for this channel, consistent with our rate estimates. © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.enSupernovae: generalSupernovae: individual: SN 2020kygCombustionKinetic energyKineticsWhite dwarfsArtículoATTRIBUTION 4.0 INTERNATIONAL CC BY 4.0 Deed10.1093/mnras/stac177