SN 2020kyg and the rates of faint Iax supernovae from ATLAS
| Autor: | 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 |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
individual: SN 2020kyg [supernovae] REDSHIFT FOS: Physical sciences Astronomy and Astrophysics LATE-TIME SPECTROSCOPY WHITE-DWARF TRANSIENT I 2005HK EVOLUTION GAIA DR2 EXTREMELY LOW-LUMINOSITY Space and Planetary Science NEAR-INFRARED OBSERVATIONS Astrophysics - High Energy Astrophysical Phenomena general [supernovae] QB |
| Zdroj: | Srivastav, S, 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 2022, ' SN 2020kyg and the rates of faint Iax supernovae from ATLAS ', Monthly Notices of the Royal Astronomical Society, vol. 511, no. 2, pp. 2708-2731 . https://doi.org/10.1093/mnras/stac177 Srivastav, S, 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 2022, ' SN 2020kyg and the rates of faint Iax supernovae from ATLAS ', Monthly Notices of the Royal Astronomical Society, vol. 511, no. 2, pp. 2708–2731 . https://doi.org/10.1093/mnras/stac177 |
| ISSN: | 1745-3933 |
| DOI: | 10.1093/mnras/stac177 |
| Popis: | We present multi-wavelength follow-up observations of the ATLAS discovered faint Iax supernova SN 2020kyg that peaked at an absolute magnitude of $M_g \approx -14.9 \pm 0.2$, making it another member of the faint Iax supernova population. The bolometric light curve requires only $\approx 7 \times 10^{-3}$ M$_{\odot}$ of radioactive $^{56}$Ni, with an ejected mass of $M_{\rm ej} \sim 0.4$ M$_{\odot}$ and a low kinetic energy of $E \approx 0.05 \pm 0.02 \times 10^{51}$ 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 ($M_r \gtrsim -16$) 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 ($M_r \lesssim -17.5$) like 2002cx and 2005hk accounting for only $0.9^{+1.1}_{-0.5}\%$ of the Ia rate (a 2$\sigma$ 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. Comment: Accepted to MNRAS after minor revision |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|