Looking into the cradle of the grave

January 5, 2022
The observed Hβ line (red) can be understood as a single broad absorption from the stellar photosphere filled in by a double peak emission from the circumstellar material. Image Credit: A&A.

Joris Vos (former Humboldt fellow in our group) and several members of our team, have recently discovered a new type of hot subdwarf, named J22564-5910. It is rapidly spinning and gas is still present in the systems. All observational evidence points towards J22564-5910 being observed very shortly after the merger phase that formed it. It is the first post-merger star observed this early after the merger event, and as such it is very valuable system to test merger theories. The study got now published in A&A.

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