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SN 2020kyg and the rates of faint Iax Supernovae from ATLAS
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(2022) SN 2020kyg and the rates of faint Iax Supernovae from ATLAS. Monthly Notices of the Royal Astronomical Society, 511 (2). pp. 2708-2731. doi:10.1093/mnras/stac177
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Official URL: https://doi.org/10.1093/mnras/stac177
Abstract
We present multi-wavelength 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 year span. Using this sample, we constrain the rates of faint Iax (Mr ≳ −16) events within 60 Mpc at $12^{+14}_{-8}\%$ of the SN Ia rate. The overall Iax rate, at $15^{+17}_{-9}\%$ 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 $0.9^{+1.1}_{-0.5}\%$ of the Ia rate (a 2σ upper limit of approximately 3%). 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 $1-18\%$ of the SN Ia rate for this channel, consistent with our rate estimates.
| Item Type: | Journal Article | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| SWORD Depositor: | Library Publications Router | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Supernovae , Supernovae -- Spectra, White dwarf stars , Astronomical spectroscopy | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Publisher: | Oxford University Press | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| ISSN: | 1745-3933 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Official Date: | April 2022 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Dates: |
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| Volume: | 511 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Number: | 2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Page Range: | pp. 2708-2731 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| DOI: | 10.1093/mnras/stac177 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Publication Status: | Published | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Access rights to Published version: | Open Access | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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