SN 2020kyg and the rates of faint Iax supernovae from ATLAS

Shubham Srivastav, S. J. Smartt, M. E. Huber, K. C. Chambers, C. R. Angus, T. W. Chen, F. P. Callan, J. H. Gillanders, O. R. McBrien, S. A. Sim, M. Fulton, J. Hjorth, K. W. Smith, D. R. Young, K. Auchettl, J. P. Anderson, G. Pignata, T. J.L. De Boer, C. C. Lin, E. A. Magnier

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11 引文 斯高帕斯(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.

頁(從 - 到)2708-2731
期刊Monthly Notices of the Royal Astronomical Society
出版狀態已出版 - 1 4月 2022


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