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25 April 2024 |
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Nebular-Phase Spectra of Nearby Type Ia Supernovae | | Melissa L. Graham
; Sahana Kumar
; Griffin Hosseinzadeh
; Daichi Hiramatsu
; Iair Arcavi
; D. Andrew Howell
; Stefano Valenti
; David J. Sand
; Jerod T. Parrent
; Curtis McCully
; Alexei V. Filippenko
; | | Date: |
25 Aug 2017 | | Abstract: | We present late-time spectra of eight Type Ia supernovae (SNe Ia) obtained at
$>200$ days after peak brightness using the Gemini South and Keck telescopes.
All of the SNe Ia in our sample were nearby, well separated from their host
galaxy’s light, and have early-time photometry and spectroscopy from the Las
Cumbres Observatory (LCO). Parameters are derived from the light curves and
spectra such as peak brightness, decline rate, photospheric velocity, and the
widths and velocities of the forbidden nebular emission lines. We discuss the
physical interpretations of these parameters for the individual SNe Ia and the
sample in general, including comparisons to well-observed SNe Ia from the
literature. There are possible correlations between early-time and late-time
spectral features that may indicate an asymmetric explosion, so we discuss our
sample of SNe within the context of models for an offset ignition and/or white
dwarf collisions. A subset of our late-time spectra are uncontaminated by host
emission, and we statistically evaluate our nondetections of H$alpha$ emission
to limit the amount of hydrogen in these systems. Finally, we consider the
late-time evolution of the iron emission lines, finding that not all of our SNe
follow the established trend of a redward migration at $>200$ days after
maximum brightness. | | Source: | arXiv, 1708.7799 | | Services: | Forum | Review | PDF | Favorites | |
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