New research shows that the exoplanet Janssen orbits very close to its host star, making its temperature so high that it melts anything on its surface.
Discovered for the first time in 2004, Janssen also has many names like 55 Cancri e or 5 Cnc ebut is best known for its reputation “hellish planet”. The reason is that he has one lava ocean melted to the surface with The temperature reaches almost 2,000°C.
Simulation of the planet Janssen orbiting the star Copernicus.
Simulation of the planet Janssen orbiting the star Copernicus. (Photo: NASA)
This rocky object located 40 light years away is classified among the Super Earth. It is twice the diameter of the blue planet and about 8.6 times heavier. Under the lava ocean can be filled with diamonds.
Janssen turned around Star of Copernicus in a very narrow orbit. Astronomers have long wondered whether it is still very close to its host star.
In a new study published in the journal Natural astronomy On December 8, a group of astronomers from Yale University led by Professor Debra Fischer used a new tool called EXPRES spectrometer, or EXtreme PREcisionto determine the exact nature of the planet’s orbit.
Installed on the Lowell Discovery Telescope at the Lowell Observatory in Flagstaff, Arizona, USA, EXPRES can measure small changes in Copernicus starlight as Janssen moves between Earth and the star, such as when the Moon obscures the Sun during a solar eclipse.
The team determined that Janssen’s orbit follows Copernicus’ equator at such a close distance that it takes only 17.5 hours to complete one revolution around the star. However, Janssen is not the only planet orbiting Copernicus. This system also has 4 other planets rotating in different orbits.
Astronomers believe Janssen was initially in a much colder and distant orbit, before moving closer to Copernicus. Then, gravity from the star’s equator changed the planet’s orbit and locked it.
Although Janssen was not always close to its host star, the team concluded that the exoplanet was still hot. As Copernicus approached, the hellish planet became even hotter.
“It will probably be so hot that nothing we know will survive on the surface,” Lead author Lily Zhao, a researcher at the Center for Astrophysics at the Flatiron Institute in New York, pointed out.
Our solar system is as flat as a pancake, with all the planets orbiting the Sun in the same plane because they are all formed from the same disk of gas and dust. However, when astronomers studied other planetary systems, they found that many of them did not contain planets rotating on a flat plane, which raised the question of whether our solar system is independent as in the ‘universe.
The new discovery of the Janssen super-Earth as well as the Copernicus system will help scientists better understand the formation of planetary systems and how planets develop orbits around the central star.
Article source: VnExpress
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New research shows that the exoplanet Janssen orbits so close to its host star that its temperature is so high that it melts anything on its surface. Detected…