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Measuring nickel ma...
Measuring nickel masses in Type Ia supernovae using cobalt emission in nebular phase spectra
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Childress, M. J. (author)
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Hillier, D. J. (author)
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Seitenzahl, I. (author)
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Sullivan, M. (author)
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Maguire, K. (author)
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Taubenberger, S. (author)
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Scalzo, R. (author)
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Ruiter, A. (author)
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Blagorodnova, N. (author)
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Camacho, Y. (author)
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Castillo, J. (author)
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Elias-Rosa, N. (author)
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Fraser, M. (author)
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Gal-Yam, A. (author)
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Graham, M. (author)
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Howell, D. A. (author)
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Inserra, C. (author)
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Jha, S. W. (author)
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Kumar, S. (author)
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Mazzali, P. A. (author)
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McCully, C. (author)
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Morales-Garoffolo, A. (author)
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Pandya, V. (author)
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Polshaw, J. (author)
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Schmidt, B. (author)
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Smartt, S. (author)
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Smith, K. W. (author)
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- Sollerman, Jesper (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Spyromilio, J. (author)
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Tucker, B. (author)
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Valenti, S. (author)
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Walton, N. (author)
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Wolf, C. (author)
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Yaron, O. (author)
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Young, D. R. (author)
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Yuan, F. (author)
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Zhang, B. (author)
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(creator_code:org_t)
- 2015-10-23
- 2015
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 454:4, s. 3816-3842
- Related links:
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https://eprints.soto...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- The light curves of Type Ia supernovae (SNe Ia) are powered by the radioactive decay of Ni-56 to Co-56 at early times, and the decay of Co-56 to Fe-56 from similar to 60 d after explosion. We examine the evolution of the [Co III] lambda 5893 emission complex during the nebular phase for SNe Ia with multiple nebular spectra and show that the line flux follows the square of the mass of Co-56 as a function of time. This result indicates both efficient local energy deposition from positrons produced in Co-56 decay and long-term stability of the ionization state of the nebula. We compile SN Ia nebular spectra from the literature and present 21 new late-phase spectra of 7 SNe Ia, including SN 2014J. From these we measure the flux in the [Co III] lambda 5893 line and remove its well-behaved time dependence to infer the initial mass of Ni-56 (M-Ni, produced in the explosion. We then examine Ni-56 yields for different SN Ia ejected masses (M-ej-calculated using the relation between light-curve width and ejected mass) and find that the Ni-56 masses of SNe Ia fall into two regimes: for narrow light curves (low stretch s similar to 0.7-0.9), M-Ni is clustered near MN, 0.4 Me and shows a shallow increase as Mei increases from similar to 1 to 1.4 M-circle dot; at high stretch, M-ej clusters at the Chandrasekhar mass (1.4 M-circle dot) while M-Ni, spans a broad range from 0.6 to 1.2 M-circle dot. This could constitute evidence for two distinct SN Ia explosion mechanisms.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- supernovae: general
- Astronomy
- astronomi
Publication and Content Type
- ref (subject category)
- art (subject category)
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To the university's database
- By the author/editor
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Childress, M. J.
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Hillier, D. J.
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Seitenzahl, I.
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Sullivan, M.
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Maguire, K.
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Taubenberger, S.
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show more...
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Scalzo, R.
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Ruiter, A.
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Blagorodnova, N.
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Camacho, Y.
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Castillo, J.
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Elias-Rosa, N.
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Fraser, M.
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Gal-Yam, A.
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Graham, M.
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Howell, D. A.
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Inserra, C.
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Jha, S. W.
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Kumar, S.
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Mazzali, P. A.
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McCully, C.
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Morales-Garoffol ...
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Pandya, V.
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Polshaw, J.
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Schmidt, B.
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Smartt, S.
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Smith, K. W.
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Sollerman, Jespe ...
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Spyromilio, J.
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Tucker, B.
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Valenti, S.
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Walton, N.
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Wolf, C.
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Yaron, O.
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Young, D. R.
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Yuan, F.
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Zhang, B.
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show less...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Monthly notices ...
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Stockholm University