The Pa 30 Nebula, spotted in 2021, was associated with the rare and astounding Supernova SN1181, observed in 1181 CE. Almost a thousand years ago, stargazers in China and Japan saw a brilliant “guest star” in the constellation of Cassiopeia. This event has given researchers a unique opportunity to study supernova evolution across nearly a millennium.
Supernovae are the most dynamic celestial events, occurring when a dying star explodes. Humans first noticed this dramatic event in 1181 CE when a bright “guest star” became visible in the constellation for 6 months before disappearing. It was one of the few recorded before the invention of the telescope. In 2021, astronomer Dana Patchick pointed out the origin of SN1181 in the Pa 30 Nebula in the Milky Way. This was why SN1181 stands out. It left behind an unusual remnant with a luminous white dwarf in its center.
This discovery happened in 2013 when the researchers observed materials expanding from the explosion site. By 2023, researchers noticed faint filaments inside the sphere similar to sparkles between the central star and ejected material.
A team of researchers led by Tinn Cunningham of the Harvard & Smithsonian Center for Astrophysics used the Keck Cosmic Web Imager to map these filaments and their velocities. According to the analysis, the ejected material is expanding outward at approximately 620 miles per second. This map of Pa 30 will help scientists reconstruct what it was like in the past.
The findings concluded that SN 1181 and Pa 30 are associated. This offers surprising insights into Type Iax supernovae. These events occur from a merger of two white dwarfs leading to an explosion.
“We find the material in the filaments is expanding ballistically,” says Cunningham. “This means that the material has not been slowed down nor sped up since the explosion. From the measured velocities, looking back in time, you can pinpoint the explosion to almost exactly the year 1181.”
Further research should be done to answer new questions regarding the role of reverse shock waves and how filaments are formed, constructing the story of an extraordinary event that occurred centuries ago.
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