期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 454, 期 4, 页码 3816-3842出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv2173
关键词
supernovae: general
资金
- Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO) [CE110001020]
- Australian Research Council [FL0992131]
- 'The Dark Universe' of the German Research Foundation (DFG) [TRR33]
- NASA [NNX14AB41G]
- European Community
- European Union [267251, 320360, 264895]
- Royal Society
- EU/FP7-ERC grant [615929]
- EU/FP7 via ERC grant [307260]
- Quantum Universe I-Core programme by the Israeli Committee for planning and budgeting
- ISF
- Minerva grant
- Weizmann-UK 'making connections' programme
- Kimmel award
- ARCHES award
- Spanish Ministerio de Economia y Competitividad (MINECO) [ESP2013-41268-R]
- European Research Council under the European Union [291222]
- STFC [ST/I001123/1, ST/L000709/1]
- National Science Foundation [AST-0847157, PHY-1263280]
- ESO [188.D-3003]
- W. M. Keck Foundation
- National Aeronautics and Space Administration
- Science and Technology Facilities Council [ST/I001123/1, ST/J00541X/1, ST/L000679/1, ST/M007626/1, ST/M005348/1, ST/L000709/1, ST/L00061X/1] Funding Source: researchfish
- STFC [ST/J00541X/1, ST/M007626/1, ST/L000709/1, ST/M005348/1, ST/I001123/1, ST/L00061X/1, ST/L000679/1] Funding Source: UKRI
- European Research Council (ERC) [307260] Funding Source: European Research Council (ERC)
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1313484] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1263280] Funding Source: National Science Foundation
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.
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