Direct Analysis of the Broad-Line SN 2019ein: Connection with the Core-Normal SN 2011fe
arXiv:2303.06197 · doi:10.1093/mnras/stad758
Abstract
Type Ia supernovae (SNe Ia) are important cosmological probes and contributors to galactic nucleosynthesis, particularly of the iron group elements. To improve both their reliability as cosmological probes and to understand galactic chemical evolution, it is vital to understand the binary progenitor system and explosion mechanism. The classification of SNe Ia into Branch groups has led to some understanding of the similarities and differences among the varieties of observed SNe Ia. However, partly due to small sample size, little work has been done on the broad-line or 02bo group. We perform direct spectral analysis on the pre-maximum spectra of the broad-line SN 2019ein and compare and contrast it to the core-normal SN~2011fe. Both SN 2019ein and SN 2011fe were first observed spectroscopically within two days of discovery, allowing us to follow the spectroscopic evolution of both supernovae in detail. We find that the optical depths of the primary features of both the CN and BL supernovae are very similar, except that there is a velocity shift between them. We further examine the SN 2002bo-like subclass and show that for nine objects with pre-maximum spectra in the range -6 -- -2 days with respect to B-maximum all the emission peaks of the Si II λ6355 line of BL are blueshifted pre-maximum, making this a simple classification criterion.
9 pages, 9 figures, accepted for publication in MNRAS
References in corpus (15)
- Improved Distances to Type Ia Supernovae with Two Spectroscopic Subclasses
- The Spectroscopic Diversity of Type Ia Supernovae
- The Carnegie Supernova Project: Intrinsic Colors of Type Ia Supernovae
- The Carnegie Supernova Project I: Third Photometry Data Release of Low-Redshift Type Ia Supernovae and Other White Dwarf Explosions
- Optical and Near-Infrared Observations of the Highly Reddened, Rapidly Expanding Type Ia Supernova 2006X in M100
- Optical and IR observations of SN 2002dj: some possible common properties of fast expanding SNe Ia
- Analysis of blue-shifted emission peaks in type II supernovae
- The early spectral evolution of SN 2004dt
- A JWST Near- and Mid-Infrared Nebular Spectrum of the Type Ia Supernova 2021aefx
- Carnegie Supernova Project: Classification of Type Ia Supernovae
- JWST Low-Resolution MIRI Spectral Observations of SN~2021aefx: High-density Burning in a Type Ia Supernova
- ALFALFA and WSRT Imaging of Extended HI Features in the Leo Cloud of Galaxies
- SN 2016dsg: A Thermonuclear Explosion Involving A Thick Helium Shell
- Ultraviolet Line Identifications and Spectral Formation Near Max-Light in Type Ia Supernovae 2011fe
- SN 2019ein: A Type Ia Supernova Likely Originated from a Sub-Chandrasekhar-Mass Explosion