Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 875, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/2041-8213/ab1654
Keywords
supernovae: general
Categories
Funding
- NSF [AST-1821967, 1821987, 1813708, 1813466, AST-1008343, AST-1613426, AST-1613472, AST-1715133, AST-16113455]
- Sapere Aude Level II grant from the Danish National Research Foundation (DFF)
- VILLUM FONDEN [13261]
- Aarhus University Research Fund (AUFF)
- NASA [NNX16AB25G]
- Mitchell Institute for Fundamental Physics and Astronomy
- Gemini Observatory [GS-2015A-Q-5]
- University of Hawaii [NNH14CK55B]
- NASA [NNX16AB25G, 907926] Funding Source: Federal RePORTER
Ask authors/readers for more resources
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 Ni-56 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available