Titanium hidden in dust

Iyudin, A. F.; Müller, E.; Obergaulinger, M.

doi:10.1093/mnras/stz419

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Titanium hidden in dust

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Müller, E.
Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;

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Iyudin, A. F., Müller, E., & Obergaulinger, M. (2019). Titanium hidden in dust. Monthly Notices of the Royal Astronomical Society, 485(3), 3288-3295. doi:10.1093/mnras/stz419.

Cite as: https://hdl.handle.net/21.11116/0000-0004-71E0-F

Abstract

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 ⁴⁴Ti 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.