Mid-IR Spectra of Type Ia SN 2014J in M82 Spanning the First Four Months

摘要: We present a time series of 8 - 13 $\mu$m spectra and photometry for SN 2014J obtained 57, 81, 108, 137 d after the explosion using CanariCam on Gran Telescopio Canarias. This is first mid-IR ever Type Ia supernova. These observations can be understood within framework delayed detonation model production $\sim$0.6 $\rm M_\odot$ $^{56}$Ni, consistent with observed brightness, brightness decline relation, $\gamma$-ray fluxes. The [Co III] line at 11.888 particularly useful evaluating evolution photosphere measuring amount $^{56}$Ni thus mass ejecta. Late-time profiles are rather symmetric not shifted in rest frame. see Argon emission, which provides unique probe mixing transition layer between incomplete burning nuclear statistical equilibrium. may [Fe [Ni IV] both to substantially stronger than indicated by our models. If latter identification correct, then we likely observing stable Ni, might imply central mixing. In addition, electron capture, also required requires densities larger $\sim$$1 \times 10^9$ g cm$^{-3}$, expected only white dwarfs close Chandrasekhar limit. study demonstrates that studies supernovae feasible from ground provide information, but it indicates need better atomic data.