Astronomers Capture Record-Breaking Explosion from Recurrent Nova in Neighboring Galaxy

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A team of astronomers has recorded the hottest nova explosion ever observed, named LMCN 1968-12a, located in the Large Magellanic Cloud, a satellite galaxy of the Milky Way. This recurrent nova, first discovered in 1968, has been erupting approximately every four years, with the latest explosion occurring in August 2024. Findings were reported in the journal Monthly Notices of the Royal Astronomical Society.

Utilizing the Magellan Baade and Gemini South telescopes in Chile, researchers conducted observations in near-infrared light shortly after the outburst. The results indicated that the expelled gas reached temperatures of 5.4 million degrees Fahrenheit, supported by a significant spike in ionized silicon brightness, which was 95 times greater than sunlight.

This extreme heat and unique chemical composition suggest important differences from novas observed in the Milky Way. The astrophysical dynamics involved stem from the white dwarf's interaction with a red subgiant companion star, showing how low-metallicity environments influence nova activity, according to study co-author Sumner Starrfield from Arizona State University.

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