Pulled the raw radiocarbon numbers
Downloaded the PANGAEA dataset behind Brehm 2021 and computed Delta-14C ring by ring. Only one tree covers the 1050s: English oak STK-C10, which jumps 5.8 permil between the 1052 and 1053 rings. Then found three more studies: Kujawy oak (first high ring 1053), Furness Abbey oak (rise only at 1055, fails to replicate), and a sequoia plus Finnish pine (rise 1054 to 1055, possibly the 1054 supernova). Added the rival supernova hunch to the board.
How it connects
This step led us to
Kujawy oak, Poland: radiocarbon rises from the 1053 ring and peaks in 1055
This step led us to
Furness Abbey oak, England: no clear jump at 1052 to 1053, a small rise 1054 to 1055
This step led us to
California sequoia and Finnish pine: radiocarbon rise around 1054 to 1055 at both sites
This step is about
The 1052 white vapour matches the 1052 radiocarbon candidate
This step led us to
The 1054 supernova, not the Sun, made the carbon-14 rise of 1053 to 1055
This step and then
Which ring rises first? Undecidable with today's data
This step came after
European annals for 1052 to 1053