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http://hdl.handle.net/20.500.12386/27935
Title: | A significantly off-centre 56Ni distribution for the low-luminosity type Ia supernova SN 2016brx from the 100IAS survey | Authors: | Dong, Subo Katz, Boaz Kollmeier, Juna A. Kushnir, Doron ELIAS DE LA ROSA, NANCY DEL CARMEN Bose, Subhash Morrell, Nidia Prieto, J. L. Chen, Ping Kochanek, C. S. Brandt, G. M. Holoien, T. W. -S. Gal-Yam, Avishay Morales-Garoffolo, Antonia Parker, Stuart Phillips, M. M. Piro, Anthony L. Shappee, B. J. Simon, Joshua D. Stanek, K. Z. |
Issue Date: | 2018 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 479 | Issue: | 1 | First Page: | L70 | Abstract: | 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. | URI: | http://hdl.handle.net/20.500.12386/27935 | URL: | https://arxiv.org/pdf/1805.00010.pdf https://academic.oup.com/mnrasl/article/479/1/L70/5032382 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnrasl/sly098 | Bibcode ADS: | 2018MNRAS.479L..70D | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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Dong_2018MNRAS.479L..70D_preprint.pdf | preprint | 679.34 kB | Adobe PDF | View/Open |
sly098.pdf | Pdf editoriale | 741.71 kB | Adobe PDF | View/Open |
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