Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 485, Issue 3, Pages 3288-3295Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz419
Keywords
supernovae: individual: Cas A; supernovae: individual: SN 1987A; dust, extinction; ISM: supernova remnants
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Funding
- European Research Council [CAMAP-259276, EUROPIUM-667912]
- Deutsche Forschungsgemeinschaft through Sonderforschungsbereich 'Nuclei: From Fundamental Interactions to Structure and Stars' [SFB 1245]
- Spanish Ministry of Economy and Competitivity [AYA2015-66899-C2-1-P]
- Valencian Community [PROMETEOII/2014-069]
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Cassiopeia A, one of the most intriguing Galactic supernova remnants, has been a target of many observational efforts including most recent observations by Atacama Large Millimeter/submillimeter Array (ALMA), Hubble, Herschel, Spitzer, NuSTAR, INTEGRAL, and other observatories. We use recent gamma-ray lines observations of the radioactive products of Cas A supernova explosive nucleosynthesis and spectral energy densities derived for Cas A at infrared wavelengths to speculate about the possibility of radioactive Ti-44 being locked into large dust grains. This suggestion is also supported by the possible observation of a pre-supernova outburst about 80 yr before the actual Cas A supernova explosion in 1671 AD by Italian astronomer G. D. Cassini. The plausibility of such a scenario is discussed also with reference to recent supernovae, and to the contribution of core-collapse supernovae to the overall dust production in the Galaxy.
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