GAMMA RAYS FROM TYPE Ia SUPERNOVA SN 2014J
- Space Research Institute (IKI), Profsouznaya 84/32, Moscow 117997 (Russian Federation)
- Institut for Space Sciences (ICE-CSIC/IEEC), E-08193 Bellaterra (Spain)
- Kazan Federal University (KFU), Kremlevskaya Strasse, 18, Kazan (Russian Federation)
- E.T.S.A.V., Univ. Politecnica de Catalunya, Carrer Pere Serra 1-15, E-08173 Sant Cugat del Valles (Spain)
- Institute of Astronomy of the Russian Academy of Sciences, 48 Pyatnitskaya Street, 119017, Moscow (Russian Federation)
- Université de Toulouse, UPS-OMP, IRAP, Toulouse (France)
- APC, Univ Paris Diderot, CNRS/IN2P3, CEA/Irfu, Obs de Paris, Sorbonne Paris Cité (France)
- European Space Astronomy Centre (ESA/ESAC), Science Operations Department, P.O. Box 78, E-28691 Villanueva de la Cañada, Madrid (Spain)
The whole set of INTEGRAL observations of Type Ia supernova SN 2014J, covering the period 19–162 days after the explosion, has been analyzed. For spectral fitting the data are split into early and late periods covering days 19–35 and 50–162, respectively, optimized for {sup 56}Ni and {sup 56}Co lines. As expected for the early period, much of the gamma-ray signal is confined to energies below ∼200 keV, while for the late period it is strongest above 400 keV. In particular, in the late period, {sup 56}Co lines at 847 and 1248 keV are detected at 4.7σ and 4.3σ, respectively. The light curves in several representative energy bands are calculated for the entire period. The resulting spectra and light curves are compared with a subset of models. We confirm our previous finding that the gamma-ray data are broadly consistent with the expectations for canonical one-dimensional models, such as delayed detonation or deflagration models for a near-Chandrasekhar mass white dwarf. Late optical spectra (day 136 after the explosion) show rather symmetric Co and Fe line profiles, suggesting that, unless the viewing angle is special, the distribution of radioactive elements is symmetric in the ejecta.
- OSTI ID:
- 22525259
- Journal Information:
- Astrophysical Journal, Vol. 812, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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