SN 2020kyg and the rates of faint Iax supernovae from ATLAS
SN 2020kyg and the rates of faint Iax supernovae from ATLAS
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SN 2020kyg 和来自 ATLAS 的微弱 Iax 超新星发生率
DOI：
10.1093/mnras/stac177
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发表时间：
2022
影响因子：
4.8
通讯作者：
Srivastav S
中科院分区：
文献类型：
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作者：
Srivastav S
我们给出了对ATLAS的多波长跟踪观测，发现了微弱的IAX超新星SN2020kyg，其绝对星等达到了14.9%±10.02kyg，使其成为微弱的IAX超新星群中的另一个成员。测辐射热光曲线只需要≈7×10−3M⊙的放射性56Ni，抛射质量为Mej∼0.4M⊙，低动能E≈0.05M×1051erg。我们构建了一个均匀的容量有限的样本，由ATLAS在100MPC内观察到的902个瞬变，时间跨度为3.5年。使用这个样本，我们将微弱IAX(MR≳−16)事件的速率限制在SN Ia速率的60MPC以内。在Ia速率的总体上，Ia率主要是低光度事件，发光的SNE Iax(MR≲−17.5)像2002cx和2005hk一样，只占Ia速率的5%(2σ的上限约为3% %)。我们倾向于将混合锥体WD++恒星前体通道作为微弱Iax爆炸的候选解释，该通道涉及一颗接近Chandrasekhar的质量白矮星的失败爆燃，预计将留下被束缚的残余物和一颗幸存的次级伴星。这种情况需要较短的延迟时间，这与SNE IAX的观测环境一致。此外，二元布居合成计算表明，该通道的SNIa速率与我们的速率估计一致。
We present multiwavelength follow-up observations of the ATLAS discovered faint Iax supernova SN 2020kyg that peaked at an absolute magnitude ofMg≈ −14.9 ± 0.2, making it another member of the faint Iax supernova population. The bolometric light curve requires only ≈7 × 10−3M⊙of radioactive56Ni, with an ejected mass ofMej∼ 0.4 M⊙and a low kinetic energy ofE≈ 0.05 ± 0.02 × 1051erg. 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 atof the SN Ia rate. The overall Iax rate, atof the Ia rate, is dominated by the low-luminosity events, with luminous SNe Iax (Mr≲ −17.5) like 2002cx and 2005hk, accounting for onlyof 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 ofof the SN Ia rate for this channel, consistent with our rate estimates.