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- W3103694580 abstract "Decades ago, $gamma$-ray observatories identified diffuse Galactic emission at 1.809 MeV originating from $beta^+$ decays of an isotope of aluminium, $^{26}$Al, that has a mean-life time of 1.04 Myr. Objects responsible for the production of this radioactive isotope have never been directly identified, owing to insufficient angular resolutions and sensitivities of the $gamma$-ray observatories. Here, we report observations of millimetre-wave rotational lines of the isotopologue of aluminium monofluoride that contains the radioactive isotope ($^{26}$AlF). The emission is observed toward CK Vul which is thought to be a remnant of a stellar merger. Our constraints on the production of $^{26}$Al combined with the estimates on the merger rate make it unlikely that objects similar to CK Vul are major producers of Galactic $^{26}$Al. However, the observation may be a stepping stone for unambiguous identification of other Galactic sources of $^{26}$Al. Moreover, a high content of $^{26}$Al in the remnant indicates that prior to the merger, the CK Vul system contained at least one solar-mass star that evolved to the red giant branch." @default.
- W3103694580 created "2020-11-23" @default.
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- W3103694580 date "2018-07-30" @default.
- W3103694580 modified "2023-10-16" @default.
- W3103694580 title "Astronomical detection of radioactive molecule 26AlF in the remnant of an ancient explosion" @default.
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- W3103694580 doi "https://doi.org/10.1038/s41550-018-0541-x" @default.
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