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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
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Number of Authors: 202019 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 875, no 2, article id L14Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2019. Vol. 875, no 2, article id L14
Keywords [en]
supernovae: general
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-169115DOI: 10.3847/2041-8213/ab1654ISI: 000465016600002OAI: oai:DiVA.org:su-169115DiVA, id: diva2:1320222
Available from: 2019-06-04 Created: 2019-06-04 Last updated: 2019-12-04Bibliographically approved

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Ashall, C.Hsiao, E. Y.Morrell, N.Davis, S.Taddia, Francesco
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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Astrophysical Journal Letters
Astronomy, Astrophysics and Cosmology

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