An ultra-light planet discovered by astronomers around 31 lightyears away orbits its star in eight hours.
The planet, GJ 367 b, has 55 per cent the mass of Earth, making it one of the lightest planets discovered to date, researchers at Massachusetts Institute of Technology (MIT) reveal.
GJ367 b has an area of 5,560 miles. It is smaller than Mars (4.200 mi), but still retains the composition of Mercury.
The exoplanet is likely rocky but with no lifeforms as it’s exposed to an ‘enormous’ amount of radiation, due to its small distance to its star – about 620,000 miles (1km).
For comparison, Mercury is 36 million miles away from our Sun.
GJ367 b is currently the only planet that orbits its parent star. However, astronomers suspect there could be many more.
GJ 367b, the star orbiting exoplanet shown here, does so in a very short period of time. It takes just eight hours. Similar data is not available in the Solar System. Mercury, with its orbital period measuring 88 days, is by comparison the fastest planet in our Solar System. GJ367b, which is similar to Mercury in its structure and density, is a rock planet. The planet probably contains a substantial iron core. GJ 367b is half the Sun’s size.
GJ 367 b is an ultra-short-period (USP) planet – a type of exoplanet with orbital period less than one day,
GJ 367 b is close enough that researchers could pin down properties of the planet that were not possible with previously detected USPs.
For instance, the team determined that GJ 376 b is a rocky planet and likely contains a solid core of iron and nickel, similar to Mercury’s interior.
Due to its extreme proximity to its star, the astronomers estimate GJ 376 b is blasted with 500 times more radiation than what the Earth receives from the sun.
As a result, the planet’s dayside boils at up to 2,700°F (1,500°C). At such temperatures, iron and rocks melt and any substantial atmosphere would have long vaporised away, along with any signs of life as we know it.
However, there’s still a chance of life elsewhere in this particular system, the MIT authors believe.
GJ 367 b’s star (called GJ 376, about half the size of our Sun) is a red dwarf, or M dwarf – a type of star that typically hosts multiple planets.
Researchers believe the discovery of GJ 367 b around such a star points to the possibility for more planets in this system, including one or more within what’s known as the ‘habitable zone’.
The habitable zone is the range of orbits around a star in which a planet can support liquid water.
A planet that is not part of the Solar System’s Solar System is called an exoplanet. This is an artistic rendering of what an exoplanet might look like, with its star in the background (stock image)
‘For this class of star, the habitable zone would be somewhere between a two- to three-week orbit,’ says team member George Ricker, senior research scientist in MIT’s Kavli Institute for Astrophysics and Space Research.
This star is very close to us and bright so we can see the other planets of this system. It’s like there’s a sign saying, “Look here for extra planets!”‘
The new planet was discovered by NASA’s Transiting Exoplanet Survey Satellite (TESS), which monitors the sky for changes in brightness of the nearest stars.
Scientists look through TESS data for transits – periodic dips in starlight that indicate a planet is crossing and briefly blocking a star’s light.
TESS recorded the northern sky around GJ 376 for approximately a month in 2019.
Scientists at MIT and elsewhere analysed the data, and detected a transiting object with an ultra-short, eight-hour orbit – GJ 367 b.
They ran several tests to make sure the signal was not from a ‘false positive’ source such as a foreground or background eclipsing binary star.
After confirming the object was a USP planet, they then observed the planet’s star more closely, using the High Accuracy Radial Velocity Planet Searcher (HARPS), an instrument installed on the European Southern Observatory’s telescope in Chile.
The new planet was discovered by NASA’s Transiting Exoplanet Survey Satellite (TESS), a NASA mission to spend two years discovering transiting exoplanets (artist’s impression)
From these measurements, they determined estimates on its mass as well as its size – its radius is 72 per cent that of Earth’s.
The researchers then whittled down various possibilities for the planet’s interior composition and found the scenario that best fit the data showed that an iron core likely makes up 86 per cent of the planet’s interior, similar to the makeup of Mercury.
Researchers continue to examine GJ367 b’s star and hope to discover signals from other planets in this system as they study it.
GJ 367b was further explored in an article published in Science today.