Quantifying the dust in SN 2012aw and iPTF14hls with ORBYTS

Abstract

Core-collapse supernovae (CCSNe) are potentially capable of producing large quantities of dust, with strong evidence that ejecta dust masses can grow significantly over extended periods of time. Red-blue asymmetries in the broad emission lines of CCSNe can be modelled using the Monte Carlo radiative transfer code DAMOCLES, to determine ejecta dust masses. To facilitate easier use of DAMOCLES, we present a Tkinter graphical user interface (GUI) running DAMOCLES. The GUI was tested by high school students as part of the Original Research By Young Twinkle Students (ORBYTS) programme, who used it to measure the dust masses formed at two epochs in two Type IIP CCSNe: SN 2012aw and iPTF14hls, demonstrating that a wide range of people can contribute significantly to scientific advancement. Bayesian methods were used to quantify uncertainties on our model parameters. From the presence of a red scattering wing in the day 1863 H$\alpha$ profile of SN 2012aw, we were able to constrain the dust composition to large (radius $>0.1\mu$m) silicate grains, with a dust mass of $6.0_{-3.6}^{+21.9}\times 10^{-4}{M}_{\odot }$. From the day 1158 H$\alpha$ profile of SN 2012aw, we found a dust mass of $3.0_{-2.5}^{+14}\times 10^{-4}$ M${}_{\odot }$. For iPTF14hls, we found a day 1170 dust mass of 8.1 ${}_{-7.6}^{+81}\times 10^{-5}$ M${}_{\odot }$ for a dust composition consisting of 50% amorphous carbon and 50% astronomical silicate. At 1000 days post explosion, SN 2012aw and iPTF14hls have formed less dust than SN 1987A, suggesting that SN 1987A could form larger dust masses than other Type IIP's.

arXiv commentAccepted by MNRAS on 28/11/2022, 10 pages, 6 figures. Author accepted manuscript

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