WFRF:(Shahbandeh M.)
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- Ashall, C. (author)
Carnegie Supernova Project-II : Using Near-infrared Spectroscopy to Determine the Location of the Outer Ni-56 in Type Ia Supernovae
- Article/chapterEnglish2019
Publisher, publication year, extent ...
- 2019-04-16
- American Astronomical Society,2019
- printrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:su-169115
- https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-169115URI
- https://doi.org/10.3847/2041-8213/ab1654DOI
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- Language:English
- Summary in:English
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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 and genre
- NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
- NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
- supernovae: general
Added entries (persons, corporate bodies, meetings, titles ...)
- Hsiao, E. Y. (author)
- Hoeflich, P. (author)
- 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)
- Taddia, FrancescoStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Aarhus University, Denmark(Swepub:su)ftadd (author)
- Stockholms universitetInstitutionen för astronomi (creator_code:org_t)
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- In:Astrophysical Journal Letters: American Astronomical Society875:22041-82052041-8213
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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.
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