SIMBAD references

2018MNRAS.479L..70D - Mon. Not. R. Astron. Soc., 479, L70-L75 (2018/September-1)

A significantly off-centre 56Ni distribution for the low-luminosity type Ia supernova SN 2016brx from the 100IAS survey.

DONG S., KATZ B., KOLLMEIER J.A., KUSHNIR D., ELIAS-ROSA N., BOSE S., MORRELL N., PRIETO J.L., CHEN P., KOCHANEK C.S., BRANDT G.M., HOLOIEN T.W.-S., GAL-YAM A., MORALES-GAROFFOLO A., PARKER S., PHILLIPS M.M., PIRO A.L., SHAPPEE B.J., SIMON J.D. and STANEK K.Z.

Abstract (from CDS):

We present nebular-phase spectra of the Type Ia supernova (SN Ia) 2016brx, a member of the 1991bg-like subclass that lies at the faint end of the SN Ia luminosity function. Nebular spectra are available for only three other 1991bg-like SNe, and their Co line centres are all within <=500 km s–1 of each other. In contrast, the nebular Co line centre of SN 2016brx is blue-shifted by >1500 km s–1 compared to them and by ≃1200 km s–1 compared to the rest frame. This is a significant shift relative to the narrow nebular line velocity dispersion of <=2000 km s–1 of these SNe. The large range of nebular line shifts implies that the 56Ni in the ejecta of SN 1991bg-like events is off-centre by ∼1000 km s–1 rather than universally centrally confined as previously suggested. With the addition of SN 2016brx, the Co nebular line shapes of 1991bg-like objects appear to connect with the brighter SNe Ia that show double-peaked profiles, hinting at a continuous distribution of line profiles among SNe Ia. One class of models to produce both off-centre and bimodal 56Ni distributions is collisions of white dwarfs with unequal and equal masses.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): supernovae: general - (stars:) supernovae: individual: SN 2016brx

Simbad objects: 12

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2021.11.30-17:03:42

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