A Significantly off-center Ni56 Distribution for the Low-Luminosity Type Ia Supernova SN 2016brx from the 100IAS survey
| Autor: | Dong, Subo, Katz, Boaz, Kollmeier, Juna A., Kushnir, Doron, Elias-Rosa, N., 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. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Published in Mon.Not.Roy.Astron.Soc. 479 (2018) no.1, L70-L75 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnrasl/sly098 |
| Popis: | 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 centers are all within <~ 500 km/s of each other. In contrast, the nebular Co line center of SN 2016brx is blue-shifted by >1500 km/s compared to them and by ~1200 km/s compared to the rest frame. This is a significant shift relative to the narrow nebular line velocity dispersion of <~ 2000 km/s of these SNe. The large range of nebular line shifts implies that the Ni56 in the ejecta of SN 1991bg-like events is off-center by ~1000 km/s 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-peak profiles, hinting at a continuous distribution of line profiles among SNe Ia. One class of models to produce both off-center and bi-modal Ni56 distributions is collisions of white dwarfs with unequal and equal masses. Comment: Minor Changes. Accepted by MNRAS Letter |
| Databáze: | arXiv |
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