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Carnegie Supernova ...
Carnegie Supernova Project-II : Using Near-infrared Spectroscopy to Determine the Location of the Outer Ni-56 in Type Ia Supernovae
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Ashall, C. (author)
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Hsiao, E. Y. (author)
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Hoeflich, P. (author)
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Stritzinger, M. (author)
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Phillips, M. M. (author)
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Morrell, N. (author)
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Davis, S. (author)
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Baron, E. (author)
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Piro, A. L. (author)
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Burns, C. (author)
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Contreras, C. (author)
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Galbany, L. (author)
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Holmbo, S. (author)
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Kirshner, R. P. (author)
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Krisciunas, K. (author)
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Marion, G. H. (author)
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Sand, D. J. (author)
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Shahbandeh, M. (author)
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Suntzeff, N. B. (author)
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- Taddia, Francesco (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Aarhus University, Denmark
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(creator_code:org_t)
- 2019-04-16
- 2019
- English.
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In: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8205 .- 2041-8213. ; 875:2
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
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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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- By the author/editor
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Ashall, C.
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Hsiao, E. Y.
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Hoeflich, P.
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Stritzinger, M.
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Phillips, M. M.
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Morrell, N.
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show more...
-
Davis, S.
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Baron, E.
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Piro, A. L.
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Burns, C.
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Contreras, C.
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Galbany, L.
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Holmbo, S.
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Kirshner, R. P.
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Krisciunas, K.
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Marion, G. H.
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Sand, D. J.
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Shahbandeh, M.
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Suntzeff, N. B.
-
Taddia, Francesc ...
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show less...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Stockholm University