An Incredibly Powerful White-Light Superflare Erupted from a Small, Faint Star

Live Science | 4/23/2019 | Staff
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In a galaxy 250 light-years away, a powerful magnetic explosion erupted from a tiny, faint star.

It's the coolest and smallest star that scientists have observed emitting a rare white-light superflare — a sudden eruption of magnetic energy that unleashes huge quantities of radiation, according to a statement from the University of Warwick in the U.K.

Fact - Mass - Object - Star - Transition

In fact, it's the lowest mass object that can still be considered a star, though it lies in the transition region between a typical star and a substellar object called a brown dwarf, according to the statement. Astronomers call this object an L dwarf star (and it goes by the charismatic title of "ULAS J224940.13-011236.9") — and telescopes can't usually detect its faint light.

A group of astronomers happened upon this strange star during a survey of surrounding stars, when the superflare made it 10,000 times brighter than usual, according to the statement. They then used various star survey facilities, such as the Next Generation Transit Survey (NGTS) at the European Southern Observatory's Paranal Observatory, to record the brightness...
(Excerpt) Read more at: Live Science
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