Kristine Wei Fun Lam, an astronomer at the Institute of Planetary Research at the German Aerospace Center Berlin, said that his team’s research concluded that this exoplanet is the iron core of a planet that has lost its outer mantle.
Research Lam et al. also found that the surface temperature of the planet GJ 367b is as high as the vapor point of iron, as quoted from the journal GJ 367b: A dense, ultrashort-period sub-Earth planet transiting a nearby red dwarf star.
“We think the surface of the planet could melt,” Lam said Science News.
Fact Planet New GJ 367b
One Year There Is Shorter Than One Day on Earth
The new planet GJ 367b is categorized as an Ultrashort-period (USP) planet, which is a planet outside the solar system whose year is shorter than one Earth day.
Signals for the planet’s existence were first seen in NASA’s TESS telescope data in 2019. The planet orbits its parent star, just like Earth orbits the sun, every 7.7 hours.
Covered in Liquid Lava
The planet GJ 367b is located very close to its “solar system” star. So close, the planet is shrouded in molten metallic lava.
“The temperature is around 1400° Celsius, I don’t think it’s too comfortable standing on it,” said Lam jokingly.
It used to be like Jupiter
Lam said Mercury has a planetary core that is as large as the planet GJ 367b. The researchers estimate that almost all of the exoplanet’s surface layer was released due to colliding with other planets.
He added that this new planet could have originally been a gas planet whose atmosphere was blown up by radiation from the star it orbits. For information, there are four gas planets in our solar system, namely Jupiter, Saturn, Uranus, and Neptune.
Harder than Iron
Research Lam et al. also found the density of planet GJ 367b is 8.1 grams per cubic cm, slightly harder than iron which is about 7.87 grams per cubic cm. Computer analysis found that the planet is made up of 86 percent iron in the planet’s core and rock on its surface.
Half the Weight of the Earth
From TESS data and the ground-based HARPS spectrograph at the European Southern Observatory, Chile, Lam and his research team found the radius of GJ 367b is about 0.72 times the radius of Earth. Meanwhile, it weighs about 0.55 times the mass of the earth.
So, those are the facts about the exoplanet GJ 367b, planet the new super hot is harder than iron. What planet is your favourite, detikers?
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