SN 2020kyg and the rates of faint Iax supernovae from ATLAS
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SN 2020kyg and the rates of faint Iax supernovae from ATLAS. / Srivastav, Shubham; Smartt, 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.
I: Monthly Notices of the Royal Astronomical Society, Bind 511, Nr. 2, 15.02.2022, s. 2708-2731.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - SN 2020kyg and the rates of faint Iax supernovae from ATLAS
AU - Srivastav, Shubham
AU - Smartt, S. J.
AU - Huber, M. E.
AU - Chambers, K. C.
AU - Angus, C. R.
AU - Chen, T-W
AU - Callan, F. P.
AU - Gillanders, J. H.
AU - McBrien, O. R.
AU - Sim, S. A.
AU - Fulton, M.
AU - Hjorth, J.
AU - Smith, K. W.
AU - Young, D. R.
AU - Auchettl, K.
AU - Anderson, J. P.
AU - Pignata, G.
AU - de Boer, T. J. L.
AU - Lin, C-C
AU - Magnier, E. A.
PY - 2022/2/15
Y1 - 2022/2/15
N2 - We present multiwavelength follow-up observations of the ATLAS discovered faint Iax supernova SN 2020kyg that peaked at an absolute magnitude of M-g approximate to -14.9 +/- 0.2, making it another member of the faint Iax supernova population. The bolometric light curve requires only approximate to 7 x 10(-3) M-circle dot of radioactive Ni-56, with an ejected mass of M-ej similar to 0.4 M-circle dot and a low kinetic energy of E approximate to 0.05 +/- 0.02 x 10(51) 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 (M-r greater than or similar to -16) events within 60 Mpc at 12(-8)(+1)(4) per cent of the SN Ia rate. The overall Iax rate, at 15(-9)(+)(17) per cent of the Ia rate, is dominated by the low-luminosity events, with luminous SNe Iax (M-r less than or similar to -17.5) like 2002cx and 2005hk, accounting for only 0.9(-0.5)(+1.1) per cent of the Ia rate (a 2 sigma 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.
AB - We present multiwavelength follow-up observations of the ATLAS discovered faint Iax supernova SN 2020kyg that peaked at an absolute magnitude of M-g approximate to -14.9 +/- 0.2, making it another member of the faint Iax supernova population. The bolometric light curve requires only approximate to 7 x 10(-3) M-circle dot of radioactive Ni-56, with an ejected mass of M-ej similar to 0.4 M-circle dot and a low kinetic energy of E approximate to 0.05 +/- 0.02 x 10(51) 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 (M-r greater than or similar to -16) events within 60 Mpc at 12(-8)(+1)(4) per cent of the SN Ia rate. The overall Iax rate, at 15(-9)(+)(17) per cent of the Ia rate, is dominated by the low-luminosity events, with luminous SNe Iax (M-r less than or similar to -17.5) like 2002cx and 2005hk, accounting for only 0.9(-0.5)(+1.1) per cent of the Ia rate (a 2 sigma 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.
KW - supernovae: general
KW - supernovae: individual: SN 2020kyg
KW - NEAR-INFRARED OBSERVATIONS
KW - EXTREMELY LOW-LUMINOSITY
KW - LATE-TIME SPECTROSCOPY
KW - WHITE-DWARF
KW - GAIA DR2
KW - REDSHIFT
KW - I.
KW - EVOLUTION
KW - TRANSIENT
KW - 2005HK
U2 - 10.1093/mnras/stac177
DO - 10.1093/mnras/stac177
M3 - Journal article
VL - 511
SP - 2708
EP - 2731
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 2
ER -
ID: 302384675