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Ashall, C; Hsiao, E Y; Hoeflich, P; Stritzinger, M; Phillips, M M; Morrell, N; Davis, S; Baron, E; Piro, A L; Burns, C; Contreras, C; Galbany, L; Holmbo, S; Kirshner, R P; Krisciunas, K; Marion, G H; Sand, D J; Shahbandeh, M; Suntzeff, N B; Taddia, F
Astrophysical journal. Letters, 04/2019, Letnik: 875, Številka: 2Journal Article
We present the H-band wavelength region of 37 postmaximum light near-infrared spectra of three normal, nine transitional, and four subluminous type Ia supernovae (SNe Ia), extending from +5 days to +20 days relative to the epoch of B-band maximum. We introduce a new observable, the blue-edge velocity, v edge, of the prominent Fe/Co/Ni-peak H-band emission feature, which is quantitatively measured. The v edge parameter is found to decrease over subtype ranging from around −14,000 km s−1 for normal SNe Ia, to −10,000 km s−1 for transitional SNe Ia, down to −5000 km s−1 for the subluminous SNe Ia. Furthermore, inspection of the +10 ± 3 days spectra indicates that v edge is correlated with the color-stretch parameter, s BV , and hence with peak luminosity. These results follow the previous findings that brighter SNe Ia tend to have 56Ni located at higher velocities as compared to subluminous objects. As v edge is a model-independent parameter, we propose it can be used in combination with traditional observational diagnostics to provide a new avenue to robustly distinguish between leading SNe Ia explosion models.
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