WFRF:(Shahbandeh M.)
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Carnegie Supernova Project-II : Using Near-infrared Spectroscopy to Determine the Location of the Outer Ni-56 in Type Ia Supernovae
- Ashall, C. (author)
- Hsiao, E. Y. (author)
- Hoeflich, P. (author)
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- Stritzinger, M. (author)
- Phillips, M. M. (author)
- Morrell, N. (author)
- Davis, S. (author)
- Baron, E. (author)
- Piro, A. L. (author)
- Burns, C. (author)
- Contreras, C. (author)
- Galbany, L. (author)
- Holmbo, S. (author)
- Kirshner, R. P. (author)
- Krisciunas, K. (author)
- Marion, G. H. (author)
- Sand, D. J. (author)
- Shahbandeh, M. (author)
- Suntzeff, N. B. (author)
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- (creator_code:org_t)
- 2019-04-16
- 2019
- English.
- In: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8205 .- 2041-8213. ; 875:2
- Journal article (peer-reviewed)
Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- supernovae: general
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Ashall, C.
- Hsiao, E. Y.
- Hoeflich, P.
- Stritzinger, M.
- Phillips, M. M.
- Morrell, N.
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- 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, Francesc ...
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