2021/01/27 by Jacob Teffs, Simon J. Prentice, S. Prentice +4
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Ejecta #Galaxy #Gamma-ray bursts and supernovae #Optics #Physics #Point source #Progenitor #Progenitor cell #Spectral line #Stellar, planetary, and galactic studies #Supernova #astro-ph.HE #astro-ph.SR
paper · pdf · doi:10.1093/mnras/stab258
15 pages, 13 figures. Accepted for publication by MNRAS
arxiv created 2021/01/27 · openalex publication_date 2021/01/28 · openalex created_date 2021/02/01 · arxiv updated 2021/02/10 · openalex updated_date 2026/08/06
ABSTRACT SN 2017ein is a narrow-lined Type Ic SN that was found to share a location with a point-like source in the face on spiral galaxy NGC 3938 in pre-supernova images, making SN 2017ein the first credible detection of a Type Ic progenitor. Results in the literature suggest that this point-like source is likely a massive progenitor of 60–80 M⊙, depending on if the source is a binary, a single star, or a compact cluster. Using new photometric and spectral data collected for 200 d, including several nebular spectra, we generate a consistent model covering the photospheric and nebular phase using a Monte Carlo radiation transport code. Photospheric phase modelling finds an ejected mass 1.2–2.0 M⊙ with an Ek of ∼(0.9 ± 0.2) × 1051 erg, with approximately 1 M⊙ of material below 5000 km s−1 found from the nebular spectra. Both photospheric and nebular phase modelling suggests a 56Ni mass of 0.08–0.1 M⊙. Modelling the [O i] emission feature in the nebular spectra suggests that the innermost ejecta are asymmetric. The modelling results favour a low-mass progenitor of 16–20 M⊙, which is in disagreement with the pre-supernova derived high-mass progenitor. This contradiction is likely due to the pre-supernova source not representing the actual progenitor.