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Superflares from young red dwarf stars imperil planets 5nvklj





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Superflares from young red dwarf stars imperil planets

Dragon
Dragon
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Superflares from young red dwarf stars imperil planets Empty Superflares from young red dwarf stars imperil planets

Post by Dragon Fri Oct 19, 2018 11:13 pm

The word "HAZMAT" describes substances that pose a risk to the environment, or even to life itself. Imagine the term being applied to entire planets, where violent flares from the host star may make worlds uninhabitable by affecting their atmospheres.

NASA's Hubble Space Telescope is observing such stars through a large program called HAZMAT—Habitable Zones and M dwarf Activity across Time.

"M dwarf" is the astronomical term for a red dwarf star—the smallest, most abundant and longest-lived type of star in our galaxy. The HAZMAT program is an ultraviolet survey of red dwarfs at three different ages: young, intermediate, and old.

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Superflares from young red dwarf stars imperil planets 334pu7m
Dragon
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Post by Dragon Fri Oct 19, 2018 11:15 pm

Superflares from young red dwarf stars imperil planets Superflaresf
Credit: NASA, ESA and D. Player (STScI)

Violent outbursts of seething gas from young red dwarf stars may make conditions uninhabitable on fledgling planets.

In this artist's rendering, an active, young red dwarf (right) is stripping the atmosphere from an orbiting planet (left). Scientists found that flares from the youngest red dwarfs they surveyed -- approximately 40 million years old -- are 100 to 1,000 times more energetic than when the stars are older.

They also detected one of the most intense stellar flares ever observed in ultraviolet light -- more energetic than the most powerful flare ever recorded from our Sun.

Source / Image Courtesy


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Superflares from young red dwarf stars imperil planets 334pu7m
Dragon
Dragon
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Superflares from young red dwarf stars imperil planets Empty Re: Superflares from young red dwarf stars imperil planets

Post by Dragon Fri Oct 19, 2018 11:17 pm



New observations by two Arizona State University astronomers using the Hubble Space Telescope have caught a red dwarf star in a violent outburst, or superflare. The blast of radiation was more powerful than any such outburst ever detected from the Sun, and would likely affect the habiltability of any planets orbitiing it.

Moreover, the astronomers say, such superflares appear more common in younger red dwarfs, which erupt 100 to 1000 times more powerfully than they will when they age.


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Superflares from young red dwarf stars imperil planets 334pu7m

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