Synthetic light curves and spectra from a self-consistent 2D simulation of an ultra-strippped supernova

Thomas Maunder, Bernhard Müller, Fionntan Callan, Stuart Sim, Alexander Heger

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Abstract

Spectroscopy is an important tool for providing insights into the structure of core-collapse supernova explosions. We use the Monte Carlo radiative transfer code Artis to compute synthetic spectra and light curves based on a two-dimensional explosion model of an ultra-stripped supernova. These calculations are designed both to identify observable fingerprints of ultra-stripped supernovae and as a proof-of-principle for using synthetic spectroscopy to constrain the nature of stripped-envelope supernovae more broadly. We predict characteristic spectral and photometric features for our ultra-stripped explosion model, and find that these do not match observed ultra-stripped supernova candidates like SN 2005ek. With a peak bolometric luminosity of 6.8 × 1041 erg s−1, a peak magnitude of −15.9 mag in R–band, and Δm15, R = 3.50, the model is even fainter and evolves even faster than SN 2005ek as the closest possible analogue in photometric properties. The predicted spectra are extremely unusual. The most prominent features are Mg II lines at 2,800 Å and 4,500 Å and the infrared Ca triplet at late times. The Mg lines are sensitive to the multi-dimensional structure of the model and are viewing-angle dependent. They disappear due to line blanketing by iron group elements in a spherically averaged model with additional microscopic mixing. In future studies, multi-D radiative transfer calculations need to be applied to a broader range of models to elucidate the nature of observed Type Ib/c supernovae.
Original languageEnglish
Pages (from-to)2185–2197
Number of pages23
JournalMonthly Notices of the Royal Astronomical Society
Volume527
Issue number2
Early online date27 Oct 2023
DOIs
Publication statusPublished - Jan 2024

Keywords

  • Space and Planetary Science
  • Astronomy and Astrophysics

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