Observations and spectral modelling of the narrow-lined Type Ic SN 2017ein
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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- April 2021
- DOI:
- 10.1093/mnras/stab258
- arXiv:
- arXiv:2101.11340
- Bibcode:
- 2021MNRAS.502.3829T
- Keywords:
-
- radiative transfer;
- supernovae: general;
- supernovae: individual: SN2017ein;
- Astrophysics - High Energy Astrophysical Phenomena;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 15 pages, 13 figures. Accepted for publication by MNRAS