Titanium hidden in dust. (arXiv:1902.02249v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Iyudin_A/0/1/0/all/0/1">A. Iyudin</a> (SINP, Moscow State University, Moscow), <a href="http://arxiv.org/find/astro-ph/1/au:+Muller_E/0/1/0/all/0/1">E. M&#xfc;ller</a> (MPA, Garching), <a href="http://arxiv.org/find/astro-ph/1/au:+Obergaulinger_M/0/1/0/all/0/1">M. Obergaulinger</a> (TU Darmstadt, Univ. Val&#xe8;ncia)

Cassiopeia A, one of the most intriguing galactic supernova remnants, has
been a target of many observational efforts including most recent observations
by 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 as well as spectral energy densities
derived for Cas A at infrared wavelengths to speculate about the possibility of
radioactive 44Ti being locked into large dust grains. This suggestion is also
supported by the possible observation of a pre-supernova outburst about 80
years 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.

Cassiopeia A, one of the most intriguing galactic supernova remnants, has
been a target of many observational efforts including most recent observations
by 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 as well as spectral energy densities
derived for Cas A at infrared wavelengths to speculate about the possibility of
radioactive 44Ti being locked into large dust grains. This suggestion is also
supported by the possible observation of a pre-supernova outburst about 80
years 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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